CN103471809B - A kind of ultrahigh frequency response plasma flow measurement device - Google Patents
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Abstract
The invention discloses a kind of ultrahigh frequency response plasma flow measurement device, comprise amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, the voltage that power supply provides is successively by producing high-frequency and high-voltage level after amplifier and variable-frequency variable-voltage device, high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, between two electrodes of plasma probe or between two electrodes of sensor, inspire plasma field; Be included in upstream oscillating flow speed in high-frequency and high-voltage voltage or the pressure surge of wall unsteady flo w is detected by high-voltage probe and transfers to modulation-demodulation device, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, flow field signal separated from high-frequency and high-voltage voltage, in data collector, completes collection, store and analyze.Utilize the present invention, high spatial resolution and temporal resolution requirement can be met simultaneously, realize the measurement of stream field dither, eddy structure.
Description
Technical field
The present invention relates to Aero-Space medium-high frequency, high enthalpy and high speed Unsteady Flow field of measuring technique, especially for a kind of ultrahigh frequency response plasma flow measurement device of turbomachine inside complex three-dimensional nonstationary flow field measurement.
Background technology
The development of any theory all be unable to do without experiment, and the flowing of Aero-Space High Mach number, high turbulence pulsation, high enthalpy be unable to do without, and Aerothermodynamics of Turbomachinery also be unable to do without.Due to typical three-dimensional, the unsteady complex flow of turbomachine, it comprises High Mach number, high turbulence pulsation, the flowing of high enthalpy, be also the difficult problem that this field needs surging and solution to the measurement in its flow field always.Along with the develop rapidly of science and technology of aviation, the design optimization of turbomachine is also from early stage one dimension designs full three-dimensional design till now, the development of computer hardware and software is only depended in the development of Digital calculation modelling software, and the many multi-disciplinary Parallel Developments of the development need of experiment measuring means: material, electronics, computing machine and processing manufacturing industry, cause experiment measuring means to lag behind numerical evaluation always, reliable experimental data cannot be provided for numerical evaluation.
Because early stage turbomachinery design method adds experiential modification in two dimension without on viscosity flow model basis, so, test method is mostly TWO-DIMENSIONAL CASCADE experiment, and corresponding measuring method mostly is steady pressure and the temperature measuring tools such as pitot tube, porous probe, thermopair.Along with theoretical developments is to accurate three-dimensional three-dimensional flow model, pneumatic plant and the turbine test platform of all kinds of low speed/high speed emerge in an endless stream, and the surveying instrument such as hot-wire anemometer, piezoresistive dynamic pressure sensor also arises at the historic moment.Along with compressor pressure ratio, the improving constantly of turbine inlet temperature, turbomachine internal flow becomes increasingly complex, and complete three peacekeeping unsteady aerodynamic effect are more and more significant, and the CFD analog capability of the Complex Flows such as angular region, leakage flow is more and more stronger, and computational accuracy is also more and more higher.Calculate with CFD and add that the theoretical design means for core of intelligent optimization is progressively replacing the past to simplify the Design Mode that theoretical model adds experimental formula.As the most fundamental means of checking CFD result of calculation, experimental study seems extremely important.The at full speed progress of CFD on unsteady flo w and full Three dimensional Turbulent N-S equation also just proposes new requirement to experimental study, and the internal measurement means in the urgent need to advanced person catch and extract the unsteady flo w information of flowing and the fine structure of three-dimensional flow field.
Along with the continuous renewal of CFD technology and measurement means develops, still there is a difficult problem much in the urgent need to address in turbomachine field: one, the driving power that effective control is traction pneumatic plant flow unstable mechanism and control technology research is always implemented to rotating stall and the astable phenomenon of surge.Current advanced engine adopts active control technology in a large number, require Real-Time Monitoring pneumatic plant state, very high to the requirement of frequency response, some need within several milliseconds, detect that the exception of pressure or speed is pulsed and starts corresponding control device with the engine that prominent tip stall precursor is unstability approach.For reserving the response time to mechanical actuation mechanism, detecting and judging to complete within tens of microseconds, the frequency response demand of sensor may up to the rank of 1MHz, but does not still have the technology that can meet this requirement at present.Its two, low reynolds number low-pressure turbine often occur boundary-layer be separated and turn twist phenomenon, for the measurement of Boundary Layer Transition process, then require that surveying instrument has high frequency sound, small size, and stream field affects minimum feature.Although the most ripe hotting mask technology of current development can resolve the space structure of boundary-layer, its frequency response is too low, can not meet far away equally up to the flow field fluctuation measurement demand of 1MHz rank.Its three, in High Mach number turbomachine, the stability of shock wave and turbomachine has direct relevance.It is very difficult that shock wave motion is directly measured in experiment, the normal employing indirect method of measurement, namely multi-channel high-speed synchronous is used, utilize the dynamic pressure transducer of high precision, small size, high frequency sound, and genlock device (adopting the external trigger signal that magnet steel-inductor wire ring type signal generator provides), catch the intermitter change of each measuring point transient pressure of shock wave motor area wall and rate of heat flow to measure shock-wave spot.But, to the flow phenomenon of this kind of abrupt local of the shock wave be positioned within rotating coordinate system, under main dependence absolute coordinate system, high frequency sound sensor realizes meticulous spatial resolution, and current surveying instrument is also not enough to tell the precision being enough to verify numerical result.
In sum, for the Strategic Demand that current Aerothermodynamics of Turbomachinery develops, in the urgent need to probe, the sensor of super-high frequency response (namely frequency response reaches 1MHz).The frequency response of this rank does not realize by traditional piezoelectric ceramics, heated filament or hotting mask, needs new principle and new method.In fact, as far back as 1934, the California Institute of Technology at that time also under Feng Kamen leader makes high frequency sound velocity probe with regard to proposition plasma glow discharge principle, and obtains the your kind effort support of Laboratory Chief-Feng Kamen professor at that time.At that time, Lindvall just proposed glow discharge to be applied to wind gage.He utilizes direct current glow discharge to measure flow around cylinder speed.1949, the Mettler of California Institute of Technology successfully developed the low direct current glow discharge wind gage of a noise, and tests successfully under 1.6 Mach numbers.He is also studied the quantitative theory of air draught glow discharge, finds that wind gage is insensitive to temperature.Nineteen fifty-five Werner devises and can measure 0.8 Mach number flowing, and uncompensated frequency response is at least the wind gage of 100kHz.In the glow discharge anemometer developed in early days, the direct current of Vrebalovich (1954) and alternating current glow discharge design are relatively given prominence to.Especially As time goes on direct current designs that electrode degrading aspect is more superior.He utilizes direct drive probe, can measure the boundary-layer of Mach number from 1.3 to 4, and have 700kHz carrier frequency.But because Aerothermodynamics of Turbomachinery did not also develop into the corresponding stage at that time, the probe advanced to this kind of technology does not have demand, the level of electronic engineering and signal transacting is also very poor simultaneously, so this kind of probe lies on the table.Current, the study hotspot of to take plasma as the flow control technique of carrier at last decade be always fluid force educational circles, associated electrical and control technology obtain significant progress and progress.Therefore, what the present invention proposed take plasma as the ultrahigh frequency probe of carrier, sensor by a high speed, high frequency and high enthalpy flow measurement provide new solution route.
Key one ring that surveying instrument develops as turbomachine, both by the accuracy of theoretical research and calculating simulation is relied on, again for the design typification of turbomachine and manufacture provide foundation.In very long aerothermodynamics development course, two quasi-instruments are had to appear significantly contribution and still playing huge effect.Piezoresistive transducer uses the widest pressure-measuring instrument, and the data that it records once were the foundation stones of Elementary Fluid Mechanics theory.The hot wire anemometer almost monopolizing whole wind gage market is just turbulent boundary layer structure, and Shock Wave Boundary Layer interferes the development of scheduling theory to make distinctions won on the battlefield.The invention of these instruments all brings the progress of aerothermodynamics, thus is that industrial upgrading provides theory support and technical guarantee widely.But due to the impact by mass inertia and thermal inertia, the frequency response of piezoresistive transducer and hot line cannot higher than 500kHz.In order to break through this restriction, the present invention proposes based on glow discharge principle plasma probe and sensor, frequency response up to 1MHz, and is developed integrated collection, storage and is analyzed the measuring system in one, forms the ultrahigh frequency UNSTEADY FLOW measuring technique of establishing one's own system.
The plasma flow measuring technique that the present invention proposes is the new technology that a bright characteristic has broad prospect of application.This sensor that grows up with glow discharge principle and probe have the frequency response of 1MHz at least, contrast with traditional thermodynamics sensor, piezoresistive transducer, there is a lot of significant advantage, be particularly suitable for the three-dimensional Strong shear in turbomachine and high frequency UNSTEADY FLOW.
This alternating current plasma sensor and probe can also solve the extremely dependence of thermodynamics sensor for temperature, calibration process is difficult to and is generally not suitable for the problem of high enthalpy High Mach number flowing, and the not high enough and bulky problem of dynamic pressure transducer non-refractory, frequency response, realize shock-wave spot and intensity, and the measurement that high static sensitivity, high-frequency response and high enthalpy hypersonics are dynamic, therefore, also be suitable for very much the various flowings needing to carry out hypersonic measurement, also have wide practical use in the field such as space flight, advanced weaponry.
Summary of the invention
(1) technical matters that will solve
In view of this, fundamental purpose of the present invention is to provide a kind of ultrahigh frequency response plasma flow measurement device, to solve existing surveying instrument because frequency response is low, size is large, and cannot detailed measurements high speed, Gao Han, high frequency flow field problem, catching high frequency flow field systolic structures by measuring in the high enthalpy flow field of high speed, reaching the object of the inner Complex Flows mechanism of quantitative test turbomachine.
(2) technical scheme
For achieving the above object, the invention provides a kind of ultrahigh frequency response plasma flow measurement device, this device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein: the voltage that power supply provides is successively by after amplifier and variable-frequency variable-voltage device, produce high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, plasma field is inspired between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the pressure surge of wall unsteady flo w; Be included in upstream oscillating flow speed in high-frequency and high-voltage voltage or the pressure surge of wall unsteady flo w is detected by high-voltage probe and transfers to modulation-demodulation device, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, in data collector, complete collection, store and analyze.
In such scheme, described plasma probe has identical measuring principle with described sensor, and just measure purposes different, described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described sensor is arranged on wall, in order to measure the pressure surge of wall unsteady flo w.
In such scheme, described plasma probe is identical with the structure of described sensor measurement part, include two electrodes, insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, discharge to affect for preventing electrode part and measure, adopt insulation insulating space by two electrodes separately, then by contact conductor, certain voltage is applied to two electrodes, the air of electrode gap between two electrode tips is ionized, produces plasma.
In such scheme, the material that described electrode is selected is platinum or iridium.Described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.Described electrode gap is between 0.064mm to 0.17mm.
In such scheme, the overall diameter of described probe is less than 2mm, has very high spatial resolution and temporal resolution, can be used in measuring turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distribution.
In such scheme, described data collector selects the DSP high-speed collection card of TI6000 series to realize, with the speed of frequency acquisition tens MHz to MHz up to a hundred read-write high frequency sound dynamic data.
In such scheme, in order to the change of Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that described data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.
In such scheme, in order to realize storing and off-line analysis magnanimity high-frequency data, described data collector realizes the quick storage of data by peripheral hardware USB port.
(3) beneficial effect
Ultrahigh frequency response plasma flow measurement device provided by the invention, advantage is:
1, ultrahigh frequency response plasma flow measurement device provided by the invention, with traditional piezoresistive transducer, hot-wire anemometer and based on piezoresistive transducer dynamic probe compared with, it has very high frequency response, and frequency response can reach more than 1MHz, considerably beyond the response frequency response of like product.
2, ultrahigh frequency response plasma flow measurement device provided by the invention, principle adopts glow discharge principle, and the comparative maturity that glow discharge principle develops at present, and also darker than early stage to the understanding of the inferior discharge principle of soup, feasible in principle is the basic guarantee of plasma probe and sensor design and processing.
3, ultrahigh frequency response plasma flow measurement device provided by the invention, one-piece construction size is less, maximum gauge is no more than 1mm, the diameter of plasma probe head and support is all smaller, the size of sensor is also very little in addition, diameter is less than 1mm, and the impact of stream field is very little, reaches higher spatial resolution.
4, ultrahigh frequency response plasma flow measurement device provided by the invention, has very high susceptibility, when Mach 2 ship 5, to the average of mass flux and ripple components still extremely sensitive.
5, ultrahigh frequency response plasma flow measurement device provided by the invention, adopts modulation-demodulation device to provide excellent output signal, the common-mode rejection ratio that tool is good; And signal to noise ratio (S/N ratio) is higher than hot line.
6, ultrahigh frequency response plasma flow measurement device provided by the invention, is applicable to hot environment, when adopting iridium as electrode material, can work under the environment of 1000 DEG C.
Accompanying drawing explanation
Fig. 1 is based on the schematic diagram of glow discharge principle according to the ultrahigh frequency response plasma flow measurement device of the embodiment of the present invention;
Fig. 2 is the structural representation of the ultrahigh frequency response plasma flow measurement device according to the embodiment of the present invention.
Fig. 3 is the schematic diagram of plasma probe in Fig. 2;
Fig. 4 is the schematic diagram of sensor in Fig. 2;
Fig. 5 a and Fig. 5 b carries out according to the employing ultrahigh frequency response plasma flow measurement device of the embodiment of the present invention schematic diagram measured; Wherein, Fig. 5 a adopts plasma sensor, and Fig. 5 b adopts probe;
Fig. 6 a and Fig. 6 b is the caliberating device schematic diagram of the ultrahigh frequency response plasma flow measurement device according to the embodiment of the present invention, and wherein, Fig. 6 a is that peripheral flow demarcates schematic diagram, and Fig. 6 b is that schematic diagram is demarcated in sound field excitation.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The invention provides a kind of ultrahigh frequency response plasma flow measurement device, this device, based on glow discharge principle, as shown in Figure 1, after applying certain voltage in-between the electrodes, will produce plasma field.When speed of incoming flow and pressure change, the distribution of plasma between electrode can be affected, like this, in order to the plasma uniformity distribution between maintenance electrode, added voltage will change thereupon, is namely reacted the fluctuation of speed of incoming flow field and pressure field by voltage fluctuation added in potential electrode.Therefore, the present invention, by experiencing the impact of the pulsation of speed of incoming flow field and the distribution of wall pressure field pulsation plasma, catches Unsteady Flow details in detail.
The measuring principle of plasma probe: based on glow discharge principle, by loading alternating voltage, forms plasma area in-between the electrodes.When not having external drive, the electronics on anodic-cathodic and electric charge will be uniformly distributed, and electronics and electric charge movement locus are in-between the electrodes straight line.When measuring use, plasma probe is placed in flow field, once after speed of incoming flow generation, the speed of electron motion is about 350 times of electric charge, substantially not by the impact of incoming flow.But charge movement track can because the impact of speed of incoming flow changes, and the plasma motion track between electrode and distribution can be made also to change, and in order to the homogeneity of plasma between maintenance electrode, on electrode, on-load voltage also can produce fluctuation thereupon.Therefore the seizure to upstream oscillating flow details can be realized by the impact experiencing the distribution of upstream oscillating flow plasma.
Ultrahigh frequency response plasma flow measurement device provided by the invention, alive carrier frequency is depended in the frequency response of measuring, and carrier frequency can be accomplished enough high, even can more than 2MHz, namely invented plasma probe and sensor have sufficiently high frequency response.In addition, because adopted plasma probe and sensor require higher to electrode material, and electrode size only has a few tenths of a mm, make the size of invented plasma probe and sensor little, there is very high spatial resolution, stream field does not affect substantially, can be good at catching eddy structure and Pulse Pressure with High Frequency field.
As shown in Figure 2, Fig. 2 is the structural representation of the ultrahigh frequency response plasma flow measurement device according to the embodiment of the present invention, this device is by loading HF voltage at plasma probe or sensor electrode two ends, activated plasma, and experience the fluctuation of incoming flow unsteady flo w, by the voltage fluctuation between high-voltage probe potential electrode, signal is by after modulation-demodulation device, get final product the flow field fluctuation voltage of rediscover, and collection analysis etc. is carried out to it.This device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein: the voltage that power supply provides is successively by after amplifier and variable-frequency variable-voltage device, produce high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, plasma field is inspired between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the pressure surge of wall unsteady flo w; Be included in upstream oscillating flow speed in high-frequency and high-voltage voltage or the pressure surge of wall unsteady flo w is detected by high-voltage probe and transfers to modulation-demodulation device, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, in data collector, complete collection, store and analyze.
Wherein, plasma probe and sensor have identical measuring principle, and just measure purposes different, described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described sensor is arranged on wall, in order to measure the pressure surge of wall unsteady flo w.Specifically, sensor is identical with the measurement physical principle of plasma probe, but it is shorter and smaller than plasma probe, by being arranged on tested device wall, such as casing wall, dull and stereotyped inwall etc., by experiencing the impact of wall unsteady flo w pressure plasma field distribution, measure wall unsteady flo w pressure distribution, Boundary Layer Transition etc.
As shown in Fig. 3, Fig. 4 and Fig. 5, plasma probe is identical with the structure of sensor measurement part, include two electrodes, insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, discharge to affect for preventing electrode part and measure, adopt insulation insulating space by two electrodes separately, then by contact conductor, certain voltage is applied to two electrodes, the air of electrode gap between two electrode tips is ionized, produces plasma.The material that electrode is selected is platinum or iridium.Described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.Described electrode gap is between 0.064mm to 0.17mm.The overall diameter of probe is less than 2mm, has very high spatial resolution and temporal resolution, can be used in measuring turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distribution.
Voltage carrier frequency between electrode is very high, more than 2MHz, the frequency response of plasma probe and sensor can be made also very high, have sufficiently high temporal resolution, can catch dither exactly.Because the fluctuation of Unsteady Flow loads on a carrier frequency, in order to pressure and the velocity distribution of quantitative acquisition Unsteady Flow, adopt modulating and demodulating signal device, carrier wave and unsteady flo w fluctuation are separated, accurately obtain frequency and the amplitude of unsteady flo w fluctuation.
The size of plasma probe and sensor is little, has sufficiently high spatial resolution, and stream field interference is little, can catch more Flow details.The size of plasma probe is very little, interelectrode distance is less than 1mm, and the overall diameter of probe, less than 2mm, has very high spatial resolution and temporal resolution, may be used for measuring turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distribution.Because electrode size is very little, in order to prevent long-term electric discharge between electrode from causing electrode burn, adopt more durable sensing element, as platinum, iridium or other alloy materials.
In order to the Unsteady Flow fluctuation data of frequency response more than 1MHz can be gathered, data collector selects the DSP high-speed collection card of TI6000 series to realize, with the speed of frequency acquisition tens MHz to MHz up to a hundred read-write high frequency sound dynamic data, realize the function of multi-channel data acquisition, mass data storage and on-line analysis.In order to the change of Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.In order to realize storing and off-line analysis magnanimity high-frequency data, data collector realizes the quick storage of data by peripheral hardware USB port.
As shown in Fig. 3, Fig. 4, Fig. 5 a and Fig. 5 b, plasma probe and sensor can detect with the unsteady interaction caught between pneumatic plant tail eddy structure, sound and stall precursor, the inner high enthalpy Flow details of turbine, and the channel interior flow field of pneumatic plant high pressure stage and turbine height enthalpy high pressure stage.For the design of turbomachine and optimization provide detailed measurement data and foundation, the performance of turbomachine is made to obtain higher lifting.
In ultrahigh frequency response plasma flow measurement device, need to select to adopt probe and sensor according to measurement, the parts of its essential core are plasma probe or sensor, also have data collector.The present invention, also mainly for plasma probe and sensor, also has data collector to formulate following concrete embodiment;
Manufacture craft:
First be electrode material type selecting, because plasma probe and sensor will ensure the existence always of plasma between electrode in measuring process, this just needs electrode material will ensure glow discharge sufficiently long stabilization time, namely reduces electrode sputtering and noise level as far as possible; Material itself has high thermal conductivity, specific heat and electric conductivity, with holding electrode temperature close to gas flow temperature, reduces the curent change that the temperature difference causes; Material should have good manufacturability, namely can make given geometric configuration, ensures surfaceness.The present invention, can work main when adopting iridium as electrode material to think that the reliable material such as platinum, iridium is as electrode material at present under the environment of 1000 DEG C.
Then be choosing of electrode structure shape.In low speeds flow, electrode gap, electrode shape and reduction glow current, all can improve the susceptibility of aura to speed.Electrode structure shape of the present invention mainly contains: planar-shaped, semicircle and unsymmetrical.Any rough part of electrode surface all can affect the stability of glow discharge in addition, raised or sunken position all can cause electric-force gradient uncontinuity, thus electron focusing is on these aspects, causes local temperature to raise, melt electrode, this is one of reason producing sputtering.Therefore, manufacturing process upper electrode surface is more smooth, and glow discharge stability is also better.
Finally choosing of electrode gap.Because electrode gap is larger, plasma is easily escaped, and spatial resolution is low; And electrode gap is less, spatial resolution is high, but electrode is easily breakdown, and electrode gap difference also can be different to the susceptibility within the scope of friction speed.Therefore the present invention propose plasma probe and sensor electrode between gap approximately from 0.064mm to 0.17mm.
Demarcate technique:
First be that stable state is demarcated.Wind-tunnel changes different speed of incoming flow, the relation between developed plasma probe output voltage and speed of incoming flow is demarcated, thus draw the responsive velocity range of plasma.For the demarcation of pressure, then, when adopting normal pressure tester demarcation speed of incoming flow to be 0, the relation between plasma probe output voltage and ambient pressure variations is demarcated.And by fixing free stream Mach number on wind-tunnel, under demarcating different speed of incoming flow condition, the relation between plasma probe output voltage and pressure change.
Next is dynamic calibration.Dynamic calibration is mainly divided into the Frequency Response analysis of Frequency Response to fluctuation velocity and fluctuation pressure.The plasma probe proposed due to the present invention and the frequency response of sensor very high, up to 1MHz, existing dynamic calibration apparatus-shock tube, although good step response can be obtained, but the measuring equipment needing frequency response to exceed plasma probe and sensor in calibration process is measured and is caught step response, and this obviously cannot meet.Therefore the present invention proposes following two kinds of dynamic calibrating methods, as as described in Fig. 6 a: when fluctuation velocity is measured, by the frequency of turbulence pulsation in tail after measurement cylinder flow-disturbing, and by changing different speed of incoming flow, to obtain after the cylinder flow-disturbing of different frequency turbulence pulsation in tail, thus the Frequency Response that plasma probe measures fluctuation velocity can be detected.When measuring fluctuation pressure, need to obtain the very high pulsation source of frequency response, existing laboratory is difficult to obtain the pulsation source of frequency response up to 1MHz, and the present invention proposes to adopt and produces high frequency pressure pulsations by sound field energisation mode, carries out dynamic calibration, as shown in Figure 6 b.
Data collector
The plasma probe that the embodiment of the present invention adopts and sensor have super-high frequency response (1MHz), the feature such as high temperature resistant, and traditional acquisition system cannot meet the demands.In order to be generalized in actual measurement application, need to solve high-frequency data collection, mass data storage and read-write, the on-line analysis of data and the problem such as easy to carry.Therefore this project is intended, on the basis of plasma probe and sensor design and experiment measuring, developing plasma probe/sensor measuring system that a set of height is integrated.By selecting the dsp chip of TI6000 series to realize frequency acquisition up to tens MHz, the speed read-write high frequency sound dynamic data of MHz even up to a hundred.Simultaneously in order to the change of Real Time Observation dynamic data, realize the ability of on-line data analysis, analytical approach mainly comprises: fft analysis, correlation analysis, power spectrumanalysis etc.In order to realize, magnanimity high-frequency data be stored and off-line analysis in addition, be realized the quick storage of data by peripheral hardware USB port.
This ultrahigh frequency response plasma flow measurement device based on glow discharge principle provided by the invention, relate to aerospace field, for the measurement of current High Mach number, high turbulence pulsation and high-enthalpy fluid, utilize plasma probe provided by the invention and sensor surveying unit, high spatial resolution and temporal resolution requirement can be met simultaneously, frequency response more than 1MHz, can realize the detailed measurements of stream field dither, eddy structure.The present invention can the inner UNSTEADY FLOW of quantitative test turbomachine, vital effect is played in the aeromotor flow field survey distribute to the high speed developed with future now, high enthalpy and performance optimization, even can develop into the measurement to the high enthalpy flowing of the outside high speed of Aero-Space.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a ultrahigh frequency response plasma flow measurement device, is characterized in that, this device comprises amplifier, variable-frequency variable-voltage device, plasma probe or sensor, modulation-demodulation device and data collector, wherein:
The voltage that power supply provides, successively by after amplifier and variable-frequency variable-voltage device, produces high-frequency and high-voltage level, to meet the demand of activated plasma; After this high-frequency and high-voltage level is applied to the two ends of plasma probe or sensor, plasma field is inspired between two electrodes of plasma probe or between two electrodes of sensor, the plasma field inspired between two electrodes of plasma probe is in order to measure upstream oscillating flow speed, and the plasma field inspired between two electrodes of sensor is in order to measure the pressure surge of wall unsteady flo w; Be included in upstream oscillating flow speed in high-frequency and high-voltage voltage or the pressure surge of wall unsteady flo w is detected by high-voltage probe and transfers to modulation-demodulation device, modulation-demodulation device is compressed into row to this high-frequency high-voltage and is decomposed, flow field signal is separated from high-frequency and high-voltage voltage, and transfer to data collector, in data collector, complete collection, store and analyze.
2. ultrahigh frequency response plasma flow measurement device according to claim 1, it is characterized in that, described plasma probe has identical measuring principle with described sensor, just measures purposes different, described plasma probe is arranged in flow field, in order to measure upstream oscillating flow speed; Described sensor is arranged on wall, in order to measure the pressure surge of wall unsteady flo w.
3. ultrahigh frequency response plasma flow measurement device according to claim 2, it is characterized in that, described plasma probe is identical with the structure of described sensor measurement part, include two electrodes, insulation insulating space, insulating support and contact conductor, two electrodes are fixed on insulating support, discharge to affect for preventing electrode part and measure, adopt insulation insulating space by two electrodes separately, then by contact conductor, certain voltage is applied to two electrodes, the air of electrode gap between two electrode tips is ionized, produce plasma.
4. ultrahigh frequency response plasma flow measurement device according to claim 3, is characterized in that, the material that described electrode is selected is platinum or iridium.
5. ultrahigh frequency response plasma flow measurement device according to claim 3, is characterized in that, described electrode adopts ganoid planar-shaped, semicircle or unsymmetrical electrode.
6. ultrahigh frequency response plasma flow measurement device according to claim 3, is characterized in that, described electrode gap is between 0.064mm to 0.17mm.
7. ultrahigh frequency response plasma flow measurement device according to claim 1, it is characterized in that, the overall diameter of described probe is less than 2mm, there is very high spatial resolution and temporal resolution, can be used in measuring turbomachine channel interior high frequency velocity fluctuation, and turbulence pulsation distribution.
8. ultrahigh frequency response plasma flow measurement device according to claim 1, it is characterized in that, described data collector selects the DSP high-speed collection card of TI6000 series to realize, with the speed of frequency acquisition tens MHz to MHz up to a hundred read-write high frequency sound dynamic data.
9. ultrahigh frequency response plasma flow measurement device according to claim 1, it is characterized in that, in order to the change of Real Time Observation dynamic data, realize the ability of on-line data analysis, the data analysing method that described data collector adopts comprises: fft analysis, correlation analysis or power spectrumanalysis.
10. ultrahigh frequency response plasma flow measurement device according to claim 1, is characterized in that, in order to realize storing and off-line analysis magnanimity high-frequency data, described data collector realizes the quick storage of data by peripheral hardware USB port.
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| CN114792074B (en) * | 2022-04-25 | 2023-03-17 | 南京航空航天大学 | Method for dividing flow instability influence region |
| CN115230945B (en) * | 2022-09-15 | 2022-11-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Self-adaptive flow separation control method and system for airplane wing and storage medium |
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