CN212082825U - Full-parameter probe for measuring high subsonic three-dimensional steady flow field - Google Patents
Full-parameter probe for measuring high subsonic three-dimensional steady flow field Download PDFInfo
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- CN212082825U CN212082825U CN202020127507.4U CN202020127507U CN212082825U CN 212082825 U CN212082825 U CN 212082825U CN 202020127507 U CN202020127507 U CN 202020127507U CN 212082825 U CN212082825 U CN 212082825U
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Abstract
The invention belongs to the technical field of flow field testing, and discloses an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field. The windward side of the cylinder at the head of the probe is provided with 3 pressure sensing holes, the windward side of the blunt cone is provided with 1 pressure sensing hole, and the temperature sensor is placed in a convection heat exchange hole on the leeward side of the head of the probe so as to protect the temperature sensor from being impacted by high-speed mainstream. Compared with the existing probe, the invention can simultaneously measure the total temperature, the static temperature, the total pressure, the static pressure, the deflection angle, the pitch angle, the Mach number, the density and the three-dimensional speed of the high-subsonic three-dimensional steady-state flow field, is suitable for the three-dimensional steady-state flow field between an inlet, an outlet and an impeller stage of a high-subsonic gas compressor, a fan, a compressor and the like, and can realize high-precision, fine and multi-parameter flow field measurement.
Description
Technical Field
The invention belongs to the technical field of flow field testing, and particularly relates to an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field, which is suitable for measuring the three-dimensional steady-state flow field between an inlet, an outlet and an impeller stage of a high-subsonic gas compressor, a fan, a compressor and the like.
Background
For three-dimensional flow fields between inlets, outlets and impeller stages of hypersonic compressors, fans, compressors and the like, the flow fields are disordered and present strong three-dimensional performance due to the interaction of rotor rotation, blade tip gaps, staggered arrangement of movable and static blade rows, and blending of main flows, trails and secondary flows, so that the complex three-dimensional flow field parameters between the inlets, outlets and impeller stages of the hypersonic compressors, fans, compressors and the like are required to be accurately measured, the challenge is always provided for researchers, and the following two schemes are generally provided for measuring the complex three-dimensional flow fields at present.
Firstly, a five-hole pressure probe is independently adopted, and is driven to move to a measured position to measure by virtue of a displacement mechanism arranged on a casing, the five-hole pressure probe can only measure the total pressure, the static pressure, the deflection angle, the pitch angle and the Mach number of incoming flow, but cannot measure the total temperature; and an independent total temperature probe is also needed, and the total temperature probe is driven to move to the measured position by the aid of a displacement mechanism arranged on the casing, so that independent total temperature measurement is carried out. When the five-hole pressure probe and the total temperature probe are used independently, on one hand, the measurement time is long, the test cost is high, and the working conditions of two incoming flows may change to a certain extent; on the other hand, the measuring point positions of different probes are influenced by the positioning of the displacement mechanism, so that the positions of two times of measurement are different, so that the flow field parameters measured by the two probes are not necessarily the same streamline, and if the measurement data combination calculation speed of the probes is adopted, great errors can be caused.
Secondly, a temperature and pressure combined probe is adopted for measurement, and a temperature sensor and a pressure sensing hole are simultaneously arranged on the windward side of the probe by the traditional temperature and pressure combined probe and are opposite to incoming flow, so that a large space is required to be occupied on the surface of the probe, and the spatial resolution of flow field measurement is poor. According to the design idea of the existing total temperature probe or temperature and pressure combined probe, most of the probes are designed according to the requirement that a temperature sensor is just opposite to a main stream, the head part of the temperature probe adopts a stagnation cover structure to collect incoming flow, and the temperature sensor is placed in the stagnation cover. The disadvantages are: the first flow directly impacts a temperature sensor, and for a high subsonic flow field, because the flow velocity is very large, the temperature sensor is greatly impacted, the temperature sensor is very easy to damage, and the temperature sensor is also easily damaged by the influence of impurities such as dust, oil drops and the like in the incoming flow, so that the measurement reliability is very low; secondly, the insensitive angle range of total temperature measurement is small, when the incoming flow to be measured has a large deflection angle, the airflow cannot be sufficiently stagnant, meanwhile, the heat exchange on the surface of the temperature sensor is insufficient, and the total temperature measurement error is large; third, increasing susceptor strength, usually by increasing the size of the thermal susceptor, combined with the size of the stagnation hood, results in a larger probe size and poor spatial resolution.
Due to the measurement problems, the existing probe cannot realize accurate measurement of three-dimensional complex flow fields between inlets, outlets and impeller stages of high-subsonic compressors, fans, compressors and the like, and researchers hope to obtain fine and high-precision flow fields for verification design and diagnosis so as to improve the design. Therefore, a probe with high precision, high reliability and full parameter measurement is urgently needed, and the probe can be used for measuring the full parameters of total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density, speed and the like of three-dimensional complex flow fields between inlets, outlets and impeller stages of a high-subsonic compressor, a fan, a compressor and the like.
Disclosure of Invention
Aiming at the problems of low spatial resolution, inaccurate flow field measurement, large measurement error, low measurement precision and easy damage of a temperature sensor when the conventional probe is used for measuring a high-subsonic three-dimensional steady-state flow field, the full-parameter probe capable of simultaneously measuring the total temperature, the static temperature, the total pressure, the static pressure, the deflection angle, the pitch angle, the Mach number, the density and the speed of the high-subsonic three-dimensional steady-state flow field is provided. The probe head part of the invention consists of a cylinder and a blunt cone, four pressure sensing holes are arranged on the conical surface and the cylindrical surface to realize the three-dimensional flow field parameter measurement, and compared with the existing high subsonic flow field measurement probe, the blunt cone can effectively reduce the influence on the measured flow field and the influence of shock waves on the measurement result; in addition, the invention abandons the design idea of the traditional total temperature probe, and is based on years of research of the applicant, the invention creatively provides the layout and the structural design of placing the temperature sensor in the convection heat exchange hole on the leeward side of the head of the probe, and the temperature sensor is opposite to the pressure sensing hole, so that the simultaneous measurement of multiple parameters of the same streamline can be ensured; the impact of the airflow on the temperature sensor and the influence of dust and oil drops mixed in the airflow on the temperature sensor can be effectively reduced, and the service life of the temperature sensor is greatly prolonged; the convection heat exchange of the airflow and the temperature sensor is enhanced, and the temperature recovery coefficient is high and stable within a large deflection angle range; and the flow field full-parameter measurement is realized under the limited probe head size. Most importantly, compared with the existing high-subsonic flow field measuring probe, the high-subsonic three-dimensional steady-state flow field measuring probe can simultaneously measure the total temperature, the static temperature, the total pressure, the static pressure, the deflection angle, the pitch angle, the Mach number, the density and the speed of the high-subsonic three-dimensional steady-state flow field, has high precision and high reliability, and can realize the fine measurement of the flow field.
The technical solution of the invention is as follows:
1. the utility model provides a measure full parameter probe in three-dimensional steady state flow field of high subsonic, by probe head (1), probe branch (2), cylinder (3), blunt nosed cone (4), pressure experience left hole (5), pressure experience mesopore (6), pressure experience right hole (7), pressure experience upper hole (8), adiabatic insulating seal spare (9), temperature receptor (10), heat convection left hole (11), heat convection mesopore (12), heat convection right hole (13), temperature receptor cable draws passageway (14), the pressure tube draws passageway (15), temperature receptor cable (16) and pressure tube (17) are constituteed, its characterized in that: the probe head (1) comprises a cylinder (3) and a blunt cone (4) which share a bottom surface, 4 pressure sensing holes which are not communicated with each other are arranged on the windward side of the surface of the probe head (1), wherein 3 pressure sensing holes are arranged on the windward side of the cylinder (3) and respectively comprise a pressure sensing left hole (5), a pressure sensing middle hole (6) and a pressure sensing right hole (7), 1 pressure sensing upper hole (8) is arranged on the windward side of the blunt cone (4), 3 convection heat exchange holes are arranged on the leeward side of the cylinder (3) and respectively comprise a convection heat exchange left hole (11), a convection heat exchange middle hole (12) and a convection heat exchange right hole (13), a temperature cable receptor leading-out channel (14) is arranged in the convection heat exchange middle hole (12) along the axial direction of the cylinder (3), and the head of the temperature receptor (10) is arranged in the convection heat exchange middle hole (12), a thermally insulating seal (9) is located in the temperature receptor cable exit passage (14) for securing the temperature receptor (10).
2. Furthermore, the diameter of the cylinder (3) is 2 mm to 6 mm, the length is 20 mm to 60 mm, the taper angle of the blunt cone (4) on the bottom surface of the cylinder (3) is 90 degrees to 120 degrees, the cone tip is of a quarter spherical structure after passivation, four pressure leading pipe leading-out channels (15) and a temperature receptor cable leading-out channel (14) which are not communicated with each other are axially arranged inside the cylinder (3) along the cylinder (3), the four pressure leading pipe leading-out channels (15) are respectively communicated with the left pressure sensing hole (5), the right pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8), the pressure leading pipes (17) are respectively communicated with the left pressure sensing hole (5), the middle pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8) and lead out the tail part of the probe supporting rod (2) through the pressure leading-out channel (15), the temperature sensor cable (16) is led out of the tail of the probe supporting rod (2) through the temperature sensor cable leading-out channel (14), and the axis of the cylinder (3) of the probe head (1) is overlapped with the axis of the probe supporting rod (2).
3. Furthermore, the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) are all circular, the diameters are 0.2 mm to 1.2 mm, the central line of the pressure sensing middle hole (6) and the central line of the pressure sensing upper hole (8) are on the same plane with the axis of the cylinder (3) of the probe head (1), the pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane, the central line of the pressure sensing left hole (5) and the central line of the pressure sensing right hole (7) share the same circular circumference and are intersected with the axis of the cylinder (3), the circumference is vertical to the axis of the cylinder (3), the circumferential included angle of the circle center of the pressure sensing left hole (5) and the circle center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 60 degrees to 120 degrees, and the distance between the circle center of the pressure sensing middle hole (6) and the bottom arc of the blunt cone (4) is, the distance between the circle center of the pressure sensing upper hole (8) and the arc of the bottom surface of the blunt cone (4) is 0.4 mm to 1 mm.
4. Furthermore, the central line of the heat convection middle hole (12) coincides with the central line of the pressure sensing middle hole (6), the heat convection left hole (12) and the heat convection right hole (13) are symmetrically distributed along the central line of the heat convection middle hole (11), the central line of the heat convection left hole (11), the central line of the heat convection middle hole (12) and the central line of the heat convection right hole (13) are positioned on the same circumferential surface and intersect at a point, the circumferential surface is vertical to the axis of the cylinder (3), the intersection point is close to one side of the leeward side of the cylinder (3), the distance between the intersection point and the axis of the cylinder (3) is 0.3 mm to 1 mm, the heat convection left hole (11), the heat convection middle hole (12) and the heat convection right hole (13) are all circular, the diameter of the heat convection middle hole (12) is 1 mm to 2 mm, the diameter of the heat convection left hole (11) and the diameter of the heat, the distance between the center of the center hole (12) of the convective heat transfer and the bottom arc of the blunt cone (4) is 0.6 mm to 1.2 mm, and the included angle of the center lines of the left hole (11) of the convective heat transfer and the right hole (13) of the convective heat transfer is 160 degrees.
5. Furthermore, the temperature receptor cable leading-out channel (14) is positioned in the convection heat exchange mesopore (12), the axis of the temperature receptor cable leading-out channel is parallel to the axis of the cylinder (3), the distance between the axis of the temperature receptor cable leading-out channel and the axis of the cylinder (3) is 0.6 mm to 2 mm, the head of the temperature receptor (10) is positioned on the central line of the convection heat exchange mesopore (12) and is fixed by virtue of a heat insulation and insulation sealing element (9).
6. The probe of the invention obtains a probe calibration curve after being calibrated by a calibration wind tunnel, in the actual measurement, based on the data measured by a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8) and a temperature sensor (10), and then according to a calibration coefficient curve and a formula obtained by calibrating the wind tunnel, the total temperature, the static pressure, the deflection angle, the pitch angle, the Mach number, the density, the speed and other full parameters of a high-subsonic three-dimensional steady-state flow field can be simultaneously obtained by data processing, the structural design that the temperature sensor (10) is placed on the leeward side of the probe head (1) is creatively provided, the service life of the temperature sensor (10) and the airflow insensitivity angle range are improved, the spatial resolution is improved, and under the limited size of the probe head (1), the high-precision high-subsonic three-dimensional steady-state high, And refining and measuring all parameters.
The invention has the beneficial effects that:
the beneficial effects are that: the invention can simultaneously measure the total temperature, the static temperature, the total pressure, the static pressure, the deflection angle, the pitch angle, the Mach number, the density and the speed in the high-subsonic three-dimensional steady-state flow field, and solves the problems of long measuring time, high test cost, poor consistency of measuring working conditions and large measuring error caused by respectively adopting a five-hole pressure probe and a total temperature probe in the traditional measuring scheme.
The beneficial effects are that: the conventional temperature probe or temperature and pressure combined probe enables a temperature sensor to face a main stream, and temperature measurement is carried out on the temperature sensor by means of incoming flow stagnation, but when the main stream is high subsonic, the temperature sensor can bear great impact force, and if impurities such as dust and oil drops are also mixed in the main stream, the temperature sensor is easily damaged. The invention is based on the research of the applicant for many years, and creatively places the temperature sensors in the convection heat exchange holes on the leeward side, so that the direct impact of high-speed incoming flow on the temperature sensors is avoided, and smaller and thinner temperature sensors can be selected to improve the response time. In addition, the left hole for convective heat transfer and the right hole for convective heat transfer are formed in the two sides of the head of the probe, so that airflow can perform flowing heat transfer among the three convective heat transfer holes, and the convective heat transfer in a temperature receptor area can be enhanced to realize accurate measurement of the total temperature.
The beneficial effects are three: the existing temperature and pressure probe simultaneously places a temperature sensor and a pressure sensing hole on the windward side of the probe, which needs a large arrangement space, so that the measurement space resolution is low. The temperature sensor is arranged on the lee side of the head of the probe, the pressure sensing hole is arranged on the windward side of the head of the probe, the temperature sensor is over against the pressure sensing middle hole, the simultaneous measurement of multiple parameters of the same streamline can be ensured, the displacement mechanism is utilized to drive the probe to move, the measurement of flow field parameters of multiple planes can be realized, and the spatial resolution which is high enough can be ensured. Compared with the existing temperature and pressure probe, the flow field measurement with fine and high precision can be realized.
The beneficial effects are four: conventional temperature probes or temperature and pressure combination probes have temperature sensors facing the incoming flow, where the stagnation area is small and therefore only a narrow temperature measurement insensitive angle. The leeward side of the probe head forms a larger low-speed backflow area and a stagnation high-temperature area, and the larger high-temperature area means that the probe has a wider temperature measurement insensitive angle.
Drawings
Fig. 1 is a schematic structural diagram of an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field in a first embodiment of the present invention.
Fig. 2 is a rear view of fig. 1.
Fig. 3 is a partial cross-sectional view of the left side view of fig. 1.
Fig. 4 is a view from direction B of fig. 3.
Fig. 5 is a view in the direction C of fig. 3.
Fig. 6 is a view in the direction D of fig. 3.
Wherein: 1-probe head, 2-probe supporting rod, 3-cylinder, 4-blunt cone, 5-pressure sensing left hole, 6-pressure sensing middle hole, 7-pressure sensing right hole, 8-pressure sensing upper hole, 9-heat insulation sealing element, 10-temperature sensor, 11-convection heat exchange left hole, 12-convection heat exchange middle hole, 13-convection heat exchange right hole, 14-temperature sensor cable leading-out channel, 15-pressure leading-out tube leading-out channel, 16-temperature sensor cable, 17-pressure leading-out tube.
FIG. 7 is a schematic view of the inlet of the probe of the present invention for use in high subsonic compressors, fans, compressors and the like.
Wherein: 1-probe of the invention, 2-first stage stator, 3-first stage rotor, 4-second stage stator.
Fig. 8 is a schematic structural diagram of an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field in the second embodiment of the present invention.
Fig. 9 is a rear view of fig. 8.
Fig. 10 is a partial cross-sectional view of the left side view of fig. 8.
Fig. 11 is a view from direction B of fig. 10.
Fig. 12 is a view in the direction C of fig. 10.
Fig. 13 is a view from direction D of fig. 10.
Wherein: 1-probe head, 2-probe supporting rod, 3-cylinder, 4-blunt cone, 5-pressure sensing left hole, 6-pressure sensing middle hole, 7-pressure sensing right hole, 8-pressure sensing upper hole, 9-heat insulation sealing element, 10-temperature sensor, 11-convection heat exchange left hole, 12-convection heat exchange middle hole, 13-convection heat exchange right hole, 14-temperature sensor cable leading-out channel, 15-pressure leading-out tube leading-out channel, 16-temperature sensor cable, 17-pressure leading-out tube.
FIG. 14 is a schematic view of the probe between the stages of a high subsonic compressor, a fan, and a compressor outlet impeller according to the present invention.
Wherein: 1-first-stage rotor, 2-first-stage stator, 3-probe of the invention, 4-second-stage stator.
Detailed Description
The first embodiment is as follows:
aiming at the inlet of the high subsonic compressor, the incoming flow speed is high, and the three-dimension of the flow field is relatively weak, so that the head (1) of the probe can select a larger diameter to ensure the strength and the rigidity; the temperature sensor can be an armored thermocouple with higher strength; the diameters of the pressure sensing holes (5, 6, 7, 8) can be selected to be larger, and a larger included angle can be selected between the pressure sensing left hole (5) and the pressure sensing right hole (7), so that the following embodiments can be adopted:
fig. 1 to fig. 6 are schematic structural diagrams of an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field according to the present invention, and fig. 7 is a schematic structural diagram of the probe for an inlet of a high-subsonic compressor according to the present invention. The invention is composed of a probe head (1), a probe support rod (2), a cylinder (3) with the same bottom surface, a blunt cone (4), a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8), a heat insulation sealing element (9), a temperature sensor (10), a convection heat transfer left hole (11), a convection heat transfer middle hole (12), a convection heat transfer right hole (13), a temperature sensor cable leading-out channel (14), a pressure leading pipe leading-out channel (15), a temperature sensor cable (16) and a pressure leading pipe (17), and is characterized in that: the probe head (1) comprises a cylinder (3) and a blunt cone (4) which share a bottom surface, 4 pressure sensing holes which are not communicated with each other are arranged on the windward side of the surface of the probe head (1), wherein 3 pressure sensing holes are arranged on the windward side of the cylinder (3) and respectively comprise a pressure sensing left hole (5), a pressure sensing middle hole (6) and a pressure sensing right hole (7), 1 pressure sensing upper hole (8) is arranged on the windward side of the blunt cone (4), 3 convection heat exchange holes are arranged on the leeward side of the cylinder (3) and respectively comprise a convection heat exchange left hole (11), a convection heat exchange middle hole (12) and a convection heat exchange right hole (13), a temperature cable receptor leading-out channel (14) is arranged in the convection heat exchange middle hole (12) along the axial direction of the cylinder (3), and the head of the temperature receptor (10) is arranged in the convection heat exchange middle hole (12), a thermally insulating seal (9) is located in the temperature receptor cable exit passage (14) for securing the temperature receptor (10).
The diameter of the cylinder (3) is 6 mm, the length of the cylinder is 60 mm, the conical angle of a blunt head cone sharing the bottom surface of the cylinder (3) is 120 degrees, the cone point is of a quarter spherical structure after passivation, four pressure leading pipe leading-out channels (15) and a temperature receptor cable leading-out channel (14) which are not communicated with each other are arranged inside the cylinder (3) along the axial direction of the cylinder (3), the four pressure leading pipe leading-out channels (15) are respectively communicated with the left pressure sensing hole (5), the right pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8), the pressure leading pipe (17) is respectively communicated with the left pressure sensing hole (5), the middle pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8) and leads out the tail part of the probe supporting rod (2) through the pressure leading-out channel (15), the temperature receptor cable (16) leads out the tail part of the probe supporting rod (2) through, the axis of the cylinder (3) of the probe head (1) is coincident with the axis of the probe supporting rod (2).
The pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) are all circular, the diameters are the same and are 1.2 mm, the central line of the pressure sensing middle hole (6) and the central line of the pressure sensing upper hole (8) are on the same plane with the axis of the cylinder (3) of the probe head (1), the pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane, the central line of the pressure sensing left hole (5) and the central line of the pressure sensing right hole (7) are in the same circumferential surface and are intersected with the axis of the cylinder (3), the circumferential surface is vertical to the axis of the cylinder (3), the circumferential included angle of the circle center of the pressure sensing left hole (5) and the circle center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 120 degrees, and the distance between the circle center of the pressure sensing middle hole (6), the distance between the circle center of the pressure sensing upper hole (8) and the bottom surface arc of the blunt cone (4) is 1 mm.
The central line of the convection heat exchange middle hole (12) is coincided with the central line of the pressure sensing middle hole (6), the convection heat exchange left hole (12) and the convection heat exchange right hole (13) are symmetrically distributed along the central line of the convection heat exchange middle hole (11), the central line of the convection heat exchange left hole (11), the central line of the convection heat exchange middle hole (12) and the central line of the convection heat exchange right hole (13) are positioned on the same circumferential surface and are intersected at one point, the circumferential surface is vertical to the axis of the cylinder (3), the intersection point is close to one side of the leeward side of the cylinder (3), the distance between the axis of the cylinder (3) is 1 mm, the convection heat exchange left hole (11), the convection heat exchange middle hole (12) and the convection heat exchange right hole (13) are all circular, the diameter of the convection heat exchange middle hole (12) is 2 mm, the diameters of the convection heat exchange left hole (11) and the convection heat exchange right hole (13) are 0.8, the included angle of the central lines of the left hole (11) for heat convection and the right hole (13) for heat convection is 160 degrees.
The temperature receptor cable leading-out channel (14) is positioned in the convection heat exchange central hole, the axis of the temperature receptor cable leading-out channel is parallel to the axis of the cylinder (3), the distance between the temperature receptor cable leading-out channel and the axis of the cylinder (3) is 2 mm, and the head of the temperature receptor (10) is positioned on the central line of the convection heat exchange central hole (12) and is fixed by a heat insulation sealing element (9).
Before the device is used, standard wind tunnel calibration is needed, a probe is placed in uniform incoming flow, and under the condition that the speed and the angle of the incoming flow are known, the total pressure coefficient, the static pressure coefficient, the deflection angle coefficient, the pitch angle coefficient and the temperature coefficient under different Mach numbers are calibrated.
The method specifically comprises the following steps:
step A: in a standard wind tunnel with known incoming flow Mach number and speed, enabling the incoming flow to flow through a temperature pressure probe to generate a bypass flow;
and B: measuring the pressure of 4 pressure sensing holes on the windward surface of the probe;
and C: measuring the temperature of a temperature sensor on the lee side of the probe;
step D: defining the measured pressure of the pressure sensing left hole (5) as P1The pressure sensing center hole (6) measures the pressure P2The pressure measured by the pressure sensing right hole (7) is P3The pressure measured by the pressure sensing upper hole (8) is P4The temperature sensor (10) measures a temperature TsTotal pressure of incoming flow is PtIncoming static pressure of PsTotal temperature of incoming flow TtTherefore, the total pressure coefficient, the static pressure coefficient and the deflection angle system under different incoming flow Mach numbers can be obtainedNumber, pitch angle coefficient, total temperature recovery coefficient. The coefficients are defined as follows:
total pressure coefficient:
static pressure coefficient:
deflection angle coefficient:
pitch angle coefficient:
coefficient of temperature recovery:
therefore, calibration curves of total pressure coefficients, static pressure coefficients, deflection angle coefficients, pitch angle coefficients and total temperature recovery coefficients under different Mach numbers, different deflection angles and different pitch angles can be obtained.
The measuring process of the invention comprises the following steps:
step A: placing the probe head part in the abortion to be detected, and enabling the fluid to be detected to flow through the probe head part;
and B: measuring the pressure of three pressure sensing holes on the windward side;
and C: measuring the temperature of a leeward surface temperature sensor;
step D: and calculating a deflection angle coefficient and a pitch angle coefficient according to data of the four pressure sensing holes and temperature data measured by the temperature sensors, and then combining the calibrated coefficient curves to calculate a deflection angle, a pitch angle, total pressure, static pressure and Mach number through interpolation. The incoming flow velocity can be solved by the following formula:
c2＝γRTs
P＝ρRT
wherein gamma is the adiabatic exponent of the flow field, Ma is the mach number of the flow field, v is the flow field velocity, c is the local acoustic velocity of the flow field, ρ is the incoming flow density, and R is the gas constant.
The second embodiment:
aiming at the interstage of the high subsonic speed compressor impeller, the flow field speed is relatively small, but the measurement space is narrow, and the flow field three-dimension is relatively strong, so that the head part (1) of the probe can select a small diameter to ensure the spatial resolution and reduce the interference to the flow field to be measured; the temperature sensor can select a bare wire thermocouple or a temperature optical fiber sensor with higher response; the diameters of the pressure sensing holes (5, 6, 7, 8) can be selected to be smaller, and a smaller included angle can be selected between the pressure sensing left hole (5) and the pressure sensing right hole (7), so that the following embodiments can be adopted:
fig. 8 to 13 are schematic structural diagrams of an all-parameter probe for measuring a high-subsonic three-dimensional steady-state flow field according to the invention, and fig. 14 is a schematic diagram of the probe for use between impeller stages of a high-subsonic compressor. The invention is composed of a probe head (1), a probe support rod (2), a cylinder (3) with the same bottom surface, a blunt cone (4), a pressure sensing left hole (5), a pressure sensing middle hole (6), a pressure sensing right hole (7), a pressure sensing upper hole (8), a heat insulation sealing element (9), a temperature sensor (10), a convection heat transfer left hole (11), a convection heat transfer middle hole (12), a convection heat transfer right hole (13), a temperature sensor cable leading-out channel (14), a pressure leading pipe leading-out channel (15), a temperature sensor cable (16) and a pressure leading pipe (17), and is characterized in that: the probe head (1) comprises a cylinder (3) and a blunt cone (4) which share a bottom surface, 4 pressure sensing holes which are not communicated with each other are arranged on the windward side of the surface of the probe head (1), wherein 3 pressure sensing holes are arranged on the windward side of the cylinder (3), namely a pressure sensing left hole (5), a pressure sensing middle hole (6) and a pressure sensing right hole (7), 1 pressure sensing upper hole (8) is arranged on the windward side of the blunt cone (4), 3 convection heat exchange holes are arranged on the leeward side of the cylinder (3), namely a convection heat exchange left hole (11), a convection heat exchange middle hole (12) and a convection heat exchange right hole (13), a temperature receptor cable leading-out channel (14) is arranged in the convection heat exchange middle hole (12) along the axial direction of the cylinder (3), the temperature receptor (10) is arranged in the convection heat exchange middle hole (12), and an insulating sealing element (9) is positioned at the outlet of the temperature receptor cable leading-out channel (14), for fixing the temperature sensor (10).
The diameter of the cylinder (3) is 2 mm, the length is 20 mm, the conical angle of a blunt head cone sharing the bottom surface with the cylinder (3) is 90 degrees, the cone point is of a quarter spherical structure after passivation, four pressure leading pipe leading-out channels (15) and a temperature receptor cable leading-out channel (14) which are not communicated with each other are arranged inside the cylinder (3) along the axial direction of the cylinder (3), the four pressure leading pipe leading-out channels (15) are respectively communicated with the left pressure sensing hole (5), the middle pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8), the pressure leading pipe (17) is respectively communicated with the left pressure sensing hole (5), the middle pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8) and leads out the tail part of the probe supporting rod (2) through the pressure leading-out pipe leading-out channel (15), the temperature receptor cable (16) leads out the tail part of the probe supporting rod (2), the axis of the cylinder (3) of the probe head (1) is coincident with the axis of the probe supporting rod (2).
The pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) are all circular, the diameters are the same and are 0.2 mm, the central line of the pressure sensing middle hole (6) and the central line of the pressure sensing upper hole (8) are on the same plane with the axis of the cylinder (3) of the probe head (1), the pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane, the central line of the pressure sensing left hole (5) and the central line of the pressure sensing right hole (7) are in the same circumferential surface and are intersected with the axis of the cylinder (3), the circumferential surface is vertical to the axis of the cylinder (3), the circumferential included angle of the circle center of the pressure sensing left hole (5) and the circle center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 60 degrees, and the distance between the circle center of the pressure sensing middle hole (6), the distance between the circle center of the pressure sensing upper hole (8) and the bottom surface arc of the blunt cone (4) is 0.4 mm.
The central line of the convection heat exchange middle hole (12) is superposed with the central line of the pressure sensing middle hole (6), the convection heat exchange left hole (12) and the convection heat exchange right hole (13) are symmetrically distributed along the central line of the convection heat exchange middle hole (11), the central line of the convection heat exchange left hole (11), the central line of the convection heat exchange middle hole (12) and the central line of the convection heat exchange right hole (13) are positioned on the same circumferential surface and are intersected at one point, the circumferential surface is vertical to the axis of the cylinder (3), the intersection point is close to one side of the leeward side of the cylinder (3), and the distance between the intersection point and the axis; the heat convection left hole (11), the heat convection middle hole (12) and the heat convection right hole (13) are all circular, the diameter of the heat convection middle hole (12) is 1 mm, and the diameters of the heat convection left hole (11) and the heat convection right hole (13) are 0.3 mm; the distance between the center of the convection heat exchange middle hole (12) and the bottom arc of the blunt cone (4) is 0.6 mm, and the included angle of the center lines of the convection heat exchange left hole (12) and the convection heat exchange right hole (13) is 160 degrees.
The temperature receptor cable leading-out channel (14) is positioned in the convection heat exchange central hole, the axis of the temperature receptor cable leading-out channel is parallel to the axis of the cylinder (3), the distance between the temperature receptor cable leading-out channel and the axis of the cylinder (3) is 0.6 mm, and the temperature receptor (10) is positioned on the central line of the convection heat exchange central hole (12) and is fixed by a heat insulation sealing element (9).
After the wind tunnel calibration, the method can realize the simultaneous measurement of all parameters such as total temperature, static temperature, total pressure, static pressure, deflection angle, pitch angle, Mach number, density, speed and the like of the three-dimensional steady-state flow field between the impeller stages of the high-subsonic compressor.
Claims (1)
1. The utility model provides a measure full parameter probe in three-dimensional steady state flow field of high subsonic, by probe head (1), probe branch (2), cylinder (3), blunt nosed cone (4), pressure experience left hole (5), pressure experience mesopore (6), pressure experience right hole (7), pressure experience upper hole (8), adiabatic insulating seal spare (9), temperature receptor (10), heat convection left hole (11), heat convection mesopore (12), heat convection right hole (13), temperature receptor cable draws passageway (14), the pressure tube draws passageway (15), temperature receptor cable (16) and pressure tube (17) are constituteed, its characterized in that: the probe head (1) comprises a cylinder (3) and a blunt cone (4) which share a bottom surface, 4 pressure sensing holes which are not communicated with each other are arranged on the windward side of the surface of the probe head (1), wherein 3 pressure sensing holes are arranged on the windward side of the cylinder (3) and respectively comprise a pressure sensing left hole (5), a pressure sensing middle hole (6) and a pressure sensing right hole (7), 1 pressure sensing upper hole (8) is arranged on the windward side of the blunt cone (4), 3 convection heat exchange holes are arranged on the leeward side of the cylinder (3) and respectively comprise a convection heat exchange left hole (11), a convection heat exchange middle hole (12) and a convection heat exchange right hole (13), a temperature cable receptor leading-out channel (14) is arranged in the convection heat exchange middle hole (12) along the axial direction of the cylinder (3), and the head of the temperature receptor (10) is arranged in the convection heat exchange middle hole (12), a heat insulating seal (9) is located in the thermo-receptor cable outlet channel (14) for securing the thermo-receptor (10);
furthermore, the diameter of the cylinder (3) is 2 mm to 6 mm, the length is 20 mm to 60 mm, the taper angle of the blunt cone (4) on the bottom surface of the cylinder (3) is 90 degrees to 120 degrees, the cone tip is of a quarter spherical structure after passivation, four pressure leading pipe leading-out channels (15) and a temperature receptor cable leading-out channel (14) which are not communicated with each other are axially arranged inside the cylinder (3) along the cylinder (3), the four pressure leading pipe leading-out channels (15) are respectively communicated with the left pressure sensing hole (5), the right pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8), the pressure leading pipes (17) are respectively communicated with the left pressure sensing hole (5), the middle pressure sensing hole (6), the right pressure sensing hole (7) and the upper pressure sensing hole (8) and lead out the tail part of the probe supporting rod (2) through the pressure leading-out channel (15), a temperature sensor cable (16) is led out of the tail of the probe supporting rod (2) through a temperature sensor cable leading-out channel (14), and the axis of a cylinder (3) at the head part (1) of the probe is superposed with the axis of the probe supporting rod (2);
furthermore, the pressure sensing left hole (5), the pressure sensing middle hole (6), the pressure sensing right hole (7) and the pressure sensing upper hole (8) are all circular, the diameters are 0.2 mm to 1.2 mm, the central line of the pressure sensing middle hole (6) and the central line of the pressure sensing upper hole (8) are on the same plane with the axis of the cylinder (3) of the probe head (1), the pressure sensing left hole (5) and the pressure sensing right hole (7) are symmetrically distributed along the plane, the central line of the pressure sensing left hole (5) and the central line of the pressure sensing right hole (7) are in the same circle and intersect with the axis of the cylinder (3), the circumference surface is vertical to the axis of the cylinder (3), the circumference included angle between the circle center of the pressure sensing left hole (5) and the circle center of the pressure sensing right hole (7) on the surface of the cylinder (3) is 60 degrees to 120 degrees, the distance between the pressure sensing middle hole (6) and the bottom arc of the blunt cone (4) is 0.6 mm to 1, the distance between the circle center of the upper pressure sensing hole (8) and the arc of the bottom surface of the blunt cone (4) is 0.4 mm to 1 mm;
furthermore, the central line of the heat convection middle hole (12) coincides with the central line of the pressure sensing middle hole (6), the heat convection left hole (11) and the heat convection right hole (13) are symmetrically distributed along the central line of the heat convection middle hole (12), the central line of the heat convection left hole (11), the central line of the heat convection middle hole (12) and the central line of the heat convection right hole (13) are positioned on the same circumferential surface and intersect at a point, the circumferential surface is vertical to the axis of the cylinder (3), the intersection point is close to one side of the leeward side of the cylinder (3), the distance between the intersection point and the axis of the cylinder (3) is 0.3 mm to 1 mm, the heat convection left hole (11), the heat convection middle hole (12) and the heat convection right hole (13) are all circular, the diameter of the heat convection middle hole (12) is 1 mm to 2 mm, the diameter of the heat convection left hole (11) and the diameter of the heat, the distance between the center of the convection heat exchange middle hole (12) and the bottom surface arc of the blunt cone (4) is 0.6 mm to 1.2 mm, and the included angle of the center lines of the convection heat exchange left hole (11) and the convection heat exchange right hole (13) is 160 degrees;
furthermore, the temperature receptor cable leading-out channel (14) is positioned in the convection heat exchange mesopore (12), the axis of the temperature receptor cable leading-out channel is parallel to the axis of the cylinder (3), the distance between the axis of the temperature receptor cable leading-out channel and the axis of the cylinder (3) is 0.6 mm to 2 mm, the head of the temperature receptor (10) is positioned on the central line of the convection heat exchange mesopore (12) and is fixed by virtue of a heat insulation and insulation sealing element (9).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740021A (en) * | 2021-08-27 | 2021-12-03 | 大连透平机械技术发展有限公司 | Centrifugal compressor performance test experiment table |
| CN114136645A (en) * | 2021-10-20 | 2022-03-04 | 中国航发四川燃气涡轮研究院 | Inlet flow field measuring device for turbine component tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740021A (en) * | 2021-08-27 | 2021-12-03 | 大连透平机械技术发展有限公司 | Centrifugal compressor performance test experiment table |
| CN114136645A (en) * | 2021-10-20 | 2022-03-04 | 中国航发四川燃气涡轮研究院 | Inlet flow field measuring device for turbine component tester |
| CN114136645B (en) * | 2021-10-20 | 2023-06-02 | 中国航发四川燃气涡轮研究院 | Inlet flow field measuring device for turbine component tester |
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