CN107559230B - A kind of wind-tunnel Silence Process axial flow compressor surge preventing system using interpolation arithmetic - Google Patents
A kind of wind-tunnel Silence Process axial flow compressor surge preventing system using interpolation arithmetic Download PDFInfo
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Abstract
The invention patent discloses a kind of wind-tunnel Silence Process axial flow compressor surge preventing system using interpolation arithmetic, including central controller, Anti-surge Control unit, stationary blade regulating mechanism, monitoring unit, rotary speed controling unit；By having the surge line data of static blade angle by the surge line data of the non-measuring angle of interpolation arithmetic acquisition, anti-asthma warning line is arranged with this, unit is allowed to run under the static blade angle for not carrying out actual measurement surge line data；Under the premise of not increasing debugging efforts, cost, stable operation of unit angular interval has been widened significantly；Simultaneously by real time monitoring axial flow compressor operating condition, automatically switch anti-asthma warning line, and temperature adjustmemt is carried out to anti-asthma warning line according to unit operating condition, it is ensured that unit safe and stable operation in anti-asthma warning line.The wind-tunnel using interpolation arithmetic of the invention patent applies also for the industrial occasions that other static blade angles frequently change with Silence Process axial flow compressor anti-asthma control system.
Description
Technical Field
The invention belongs to the technical field of aerodynamic wind tunnel tests, and particularly relates to an anti-surge system of an adjustable axial flow compressor of a wind tunnel stationary blade, which adopts interpolation operation.
Background
The wind tunnel test is widely used as a method for aerodynamic research, and provides necessary guarantee for the development of the fields of aviation, aerospace, railway transportation and the like. The axial flow compressor is a key device for controlling the operation condition of the wind tunnel by the continuous wind tunnel. Surging is the inherent characteristic of axial compressor, and in order to avoid axial compressor surge operating mode to appear, the unit operating condition point that needs real-time supervision guarantees that unit operating condition is located the interval within range of steady operation, keeps away from the surge boundary, avoids the unit damage. The axial flow compressor for the wind tunnel adopts a variable frequency mode to increase the running speed interval of a unit and simultaneously adopts a static blade adjustable mode to enlarge the stable running interval of the axial flow compressor in order to ensure that the axial flow compressor meets the use condition of the wind tunnel. The angle change of the stator blade influences the surge boundary of the unit, and the stable operation interval of the unit is changed. Because the continuous wind tunnel has the advantages of short debugging time, heavy task and huge debugging cost, the method usually only tests the surge line of the common angle of the stationary blade of the axial flow compressor unit; to ensure the safety of the unit, the unit can only be operated at the angle of the stationary blade at which the surge line test has been completed.
Disclosure of Invention
Based on the defects, the invention aims to provide the anti-surge system of the wind tunnel static blade adjustable axial flow compressor, which adopts interpolation operation, aiming at the wind tunnel test requirements. The system can carry out interpolation operation through the measured stationary blade angle surge line data of the unit to obtain the surge line data corresponding to a certain stationary blade angle between the measured stationary blade angles, and an anti-surge warning line is arranged according to the reserved safety margin of the surge line, so that the stationary blade angle interval of the unit for safe operation is widened while the debugging time, the workload and the cost are reduced; the running working condition of the unit is monitored in real time, and the anti-surge warning line is automatically switched and corrected according to the running angle and the temperature of the unit, so that the unit is ensured to run stably and safely under different stationary blade angles.
The technical scheme adopted by the invention is as follows: an anti-surge system of an axial flow compressor with adjustable wind tunnel stator blades and adopting interpolation operation comprises a central controller, an anti-surge control unit, a stator blade adjusting mechanism, a monitoring unit and a rotating speed control unit; the monitoring unit monitors the flow, the angle of the stationary blade, the pressure ratio and the temperature of the compressor unit, and the rotating speed control unit controls the rotating speed of the compressor unit;
the anti-surge control unit is used for controlling a valve, the valve is arranged on a bypass loop between an inlet and an outlet of the compressor unit, and the valve can be quickly opened when the compressor unit has or is close to an anti-surge warning line, so that the flow of the inlet of the compressor unit is increased, and the pressure ratio of the inlet and the outlet of the compressor unit is reduced;
the stator blade adjusting mechanism comprises a stator blade adjusting cylinder, a rack, a servo motor, a helical gear, a support shaft, a plurality of stator blade sliding blocks and a plurality of stator blade cranks, wherein the stator blade adjusting cylinder is arranged outside a stator blade shell, the stator blade adjusting cylinder is arranged on the support shaft, the support shaft is used for supporting the stator blade adjusting cylinder and can ensure the axial movement of the stator blade adjusting cylinder, the rack is fixed on the stator blade adjusting cylinder, an output shaft of the servo motor is connected with the helical gear through a speed reducer, the helical gear is meshed with the rack, the stator blade sliding blocks are arranged in an annular groove of the stator blade adjusting cylinder, the sliding blocks can slide in the groove, each stator blade sliding block is connected with one end of one stator blade crank, each stator blade is fixedly connected with the other end of the stator blade crank at the corresponding position, and when the stator blade adjusting cylinder axially moves, all the stator blade sliding blocks axially move along with the stator blade adjusting cylinder to drive all the, all the static blades rotate along with the static blade cranks at the same time, and the running angles of the static blades are adjusted in real time when the unit runs;
the central controller obtains an actual operation working condition point of the compressor unit by utilizing data of the angle, flow, pressure ratio and temperature of the static blade measured in the operation process of the compressor unit through calculation, compares the operation working condition point with a set anti-surge warning line of the angle of the static blade, and controls the anti-surge control unit to act when the operation working condition point of the compressor unit continuously operates outside the anti-surge warning line so as to ensure that the compressor unit is far away from a surge interval;
the method comprises the steps of obtaining surge line data of an undetected angle through interpolation operation by utilizing the existing surge line data of a stationary blade angle, setting an anti-surge warning line according to the obtained surge line data, allowing a compressor unit to operate under the stationary blade angle without actually measuring the surge line data, simultaneously automatically switching the anti-surge warning line by monitoring the operation condition of the axial flow compressor unit in real time, and correcting the temperature of the anti-surge warning line according to the operation condition of the compressor unit to ensure that the compressor unit safely and stably operates in the anti-surge warning line.
For the finished unit stator blade angle theta1、θ2、θ3… … measured surge point data, itThe data format is (theta)1，Q1‐1，ε1‐1，n1)、(θ1，Q1‐2，ε1‐2，n2)、(θ1，Q1‐3，ε1‐3，n3)、(θ1，Q1‐4，ε1‐4，n4)……，(θ2，Q2‐1，ε2‐1，n1)、(θ2，Q2‐2，ε2‐2，n2)、(θ2，Q2‐3，ε2‐3，n3)、(θ2，Q2‐4，ε2‐4，n4)……，(θ3，Q3‐1，ε3‐1，n1)、(θ3，Q3‐2，ε3‐2，n2)、(θ3，Q3‐3，ε3‐3，n3)、(θ3，Q3‐4，ε3‐4，n4)……；
For static blade angle thetaxIf theta1＜θx＜θ2Then the stator blade angle is different with the rotation speed nmSurge point data (θ) of (1, 2, 3, 4 … …)x，Qx‐m，εx‐m，nm) Calculated by the following interpolation formula:
obtaining a static blade angle theta through calculationxDifferent rotational speeds nm(m is 1, 2, 3, 4 … …) corresponding surge point data (θ)x，Qx‐1，εx‐1，n1)、(θx，Qx‐2，εx‐2，n2)、(θx，Qx‐3，εx‐3，n3)、(θx，Qx‐4，εx‐4，n4)……；
Wherein,
theta is the angle of the stator blade of the compressor unit,
θp(p is 1, 2, 3, 4 … …) is the different stator blade angles of the unit;
n is the rotating speed of the compressor set,
nm(m is 1, 2, 3, 4 … …) is the different rotating speeds of the unit;
q is the inlet volume flow of the compressor set,
Qp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmThe flow rate of (a);
epsilon is the inlet-outlet pressure ratio of the compressor unit,
εp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmPressure ratio of (d).
The invention reasonably selects the angle of the static blade, actually measures the surge line data of the angle of the static blade, obtains the surge-proof warning line under the angle of the undetected static blade through interpolation operation, reserves 5-10% of safety margin of the surge line and sets the surge-proof warning line, and ensures that the unit can safely operate in the whole static blade adjusting range by monitoring the operation condition of the unit in real time. The method can effectively ensure the accuracy of predicting the surge line and the surge-proof warning line of the angle of the stator blade, and greatly expands the angle range of the stator blade in which the unit can operate without increasing the debugging work and the cost; meanwhile, the surge line and the surge prevention warning line can be automatically switched and corrected according to the angle and the temperature of the static blade. The invention can effectively reduce the debugging cost, expand the angle interval of the fixed blade of the safe operation of the unit, monitor the operation condition of the unit in real time, automatically switch the anti-surge warning line according to the operation angle and ensure the safe operation of the unit. The continuous wind tunnel stator blade adjustable axial flow compressor anti-surge warning line automatic control system can also be applied to other industrial occasions with frequently changed stator blade angles.
Drawings
FIG. 1 is a schematic control flow diagram of the present invention.
FIG. 2 is a normal stator blade angle surge line diagram for a wind tunnel unit.
FIG. 3 is a schematic diagram of an arrangement of an anti-surge control valve of a certain wind tunnel unit.
FIG. 4 is a graph comparing the calculated surge line and the measured surge line using the inventive interpolation.
Fig. 5 is a schematic view of a mounting structure of the vane adjusting mechanism.
Fig. 6 is a sectional view of the vane adjusting mechanism.
Fig. 7 is a partially enlarged view of i in fig. 6.
The device comprises a central controller 1, a central controller 2, a monitoring unit 3, a rotating speed control unit 4, an anti-surge control unit 5, a stator blade adjusting mechanism 6, a valve 7, a bypass circuit 8, a compressor unit 51, a stator blade adjusting cylinder 52, a rack 53, a servo motor 54, a helical gear 55, a support shaft 56, a stator blade slider 57, a stator blade crank 58, a stator blade 59 and a stator blade casing.
Detailed Description
The invention is described in further detail below with reference to the examples of the drawings.
Example 1
An anti-surge system of an axial flow compressor with adjustable wind tunnel stator blades and adopting interpolation operation comprises a central controller, an anti-surge control unit, a stator blade adjusting mechanism, a monitoring unit and a rotating speed control unit; the monitoring unit monitors the flow, the angle of the stationary blade, the pressure ratio and the temperature of the compressor unit, and the rotating speed control unit controls the rotating speed of the compressor unit;
as shown in fig. 3, the anti-surge control unit is used for controlling a valve, the valve is arranged on a bypass loop between an inlet and an outlet of the compressor unit, and the valve can be quickly opened when the compressor unit appears or approaches an anti-surge warning line, so that the flow of the inlet of the compressor unit is increased, and the pressure ratio of the inlet and the outlet of the compressor unit is reduced;
as shown in fig. 5-7, the stationary blade adjusting mechanism comprises a stationary blade adjusting cylinder, a rack, a servo motor, a helical gear, a supporting shaft, a plurality of stationary blade sliders and a plurality of stationary blade cranks, wherein the stationary blade adjusting cylinder is installed outside a stationary blade casing, the stationary blade adjusting cylinder is installed on the supporting shaft, the supporting shaft is used for supporting the stationary blade adjusting cylinder and can ensure the axial movement of the stationary blade adjusting cylinder, the rack is fixed on the stationary blade adjusting cylinder, an output shaft of the servo motor is connected with the helical gear through a reducer, the helical gear is meshed with the rack, the plurality of stationary blade sliders are installed in an annular groove of the stationary blade adjusting cylinder, the sliders can slide in the groove, each stationary blade slider is connected with one end of one stationary blade crank, each stationary blade is fixedly connected with the other end of the stationary blade crank at the corresponding position, and all the stationary blade sliders move axially along with the stationary blade adjusting cylinder when the stationary blade adjusting cylinder moves axially, all the static blades are driven to rotate along with the static blade cranks, and the running angles of the static blades are adjusted in real time when the unit runs;
the central controller obtains an actual operation working condition point of the compressor unit by utilizing data of the angle, flow, pressure ratio and temperature of the stator blade actually measured in the operation process of the compressor unit through calculation, compares the operation working condition point with a set anti-surge warning line of the angle of the stator blade, and controls the anti-surge control unit to act when the operation working condition point of the compressor unit continuously operates outside the anti-surge warning line so as to ensure that the compressor unit is far away from a surge interval;
the method comprises the steps of obtaining surge line data of an undetected angle through interpolation operation by utilizing the existing surge line data of a stationary blade angle, setting an anti-surge warning line according to the obtained surge line data, allowing a compressor unit to operate under the stationary blade angle without actually measuring the surge line data, simultaneously automatically switching the anti-surge warning line by monitoring the operation condition of the axial flow compressor unit in real time, and correcting the temperature of the anti-surge warning line according to the operation condition of the compressor unit to ensure that the compressor unit safely and stably operates in the anti-surge warning line.
For the finished unit stator blade angle theta1、θ2、θ3… …, in the format of (theta)1，Q1‐1，ε1‐1，n1)、(θ1，Q1‐2，ε1‐2，n2)、(θ1，Q1‐3，ε1‐3，n3)、(θ1，Q1‐4，ε1‐4，n4)……，(θ2，Q2‐1，ε2‐1，n1)、(θ2，Q2‐2，ε2‐2，n2)、(θ2，Q2‐3，ε2‐3，n3)、(θ2，Q2‐4，ε2‐4，n4)……，(θ3，Q3‐1，ε3‐1，n1)、(θ3，Q3‐2，ε3‐2，n2)、(θ3，Q3‐3，ε3‐3，n3)、(θ3，Q3‐4，ε3‐4，n4)……；
For static blade angle thetaxIf theta1＜θx＜θ2Then the stator blade angle is different with the rotation speed nmSurge point data (θ) of (1, 2, 3, 4 … …)x，Qx‐m，εx‐m，nm) Calculated by the following interpolation formula:
obtaining a static blade angle theta through calculationxDifferent rotational speeds nm(m is 1, 2, 3, 4 … …) corresponding surge point data (θ)x，Qx‐1，εx‐1，n1)、(θx，Qx‐2，εx‐2，n2)、(θx，Qx‐3，εx‐3，n3)、(θx，Qx‐4，εx‐4，n4)……；
Wherein,
theta is the angle of the stator blade of the compressor unit,
θp(p is 1, 2, 3, 4 … …) is the different stator blade angles of the unit;
n is the rotating speed of the compressor set,
nm(m is 1, 2, 3, 4 … …) is the different rotating speeds of the unit;
q is the inlet volume flow of the compressor set,
Qp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmThe flow rate of (a);
epsilon is the inlet-outlet pressure ratio of the compressor unit,
εp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmPressure ratio of (d).
Example 2
In the surge boundary debugging of the continuous wind tunnel stationary blade adjustable axial flow compressor, a proper angle interval is selected according to the designed stationary blade angle range and the common angle value, and a stationary blade angle group of a surge boundary to be detected is determined. And changing the inlet flow of the axial flow compressor by using the wind tunnel adjusting mechanism to obtain the flow-pressure ratio corresponding to the surge working point under different rotating speeds under the condition of actually measuring a certain stationary blade angle. And connecting the surge working condition points under the same angle of the stator blade to obtain a corresponding surge boundary, and reserving a certain allowance on the surge boundary to obtain a corresponding anti-surge warning line. After the surge boundary test of all the determined stator blade angle groups is completed, judging a certain undetermined stator blade angle value through a central controller, using a flow-pressure ratio array corresponding to two adjacent stator blade angle groups as basic data, respectively carrying out linear interpolation operation on flow and pressure ratio values of different rotating speeds to obtain flow-pressure ratios corresponding to different rotating speed surge operating points of the undetermined stator blade angle, and connecting the surge operating points to obtain the surge boundary of the undetermined stator blade angle value. Since the angular interval required is small, the surge margin obtained by linear interpolation is sufficiently accurate.
Referring to fig. 1, the automatic control system of the anti-surge warning line of the axial flow compressor with adjustable stationary blades identifies the angle of the stationary blades by using a central controller, automatically calculates and switches the operating stationary blade angle surge line and the anti-surge warning line by using the existing data of the stationary blade angle surge line, and monitors the operating condition of the unit in real time according to the signals of flow, pressure, temperature and the like monitored in real time; once the unit operation condition crosses the anti-surge warning line, the central controller sends an instruction to operate the anti-surge control unit to act, the bypass loop is opened, and the control valve is opened quickly, so that the unit is ensured to operate safely and stably.
Referring to fig. 2, the stationary blade adjusting range of a certain continuous wind tunnel stationary blade adjustable axial flow compressor is 35-85 degrees, and the commonly used stationary blade angles are 40 degrees, 62 degrees and 79 degrees; in order to improve debugging efficiency, reduce debugging workload and reduce debugging cost, the surge line data test of common stationary blade angles and limit angles is only completed in the process of carrying out the surge line test, and a unit is generally required to be operated at the common angle; the method comprises the steps of judging the operating stationary blade angle theta of a unit by utilizing measured surge line data, and carrying out interpolation operation according to the surge line data of two measured stationary blade angles adjacent to the stationary blade angle theta to obtain the surge line data under the operating angle theta; and a surge prevention warning line is set according to surge line data obtained by interpolation operation, so that the running safety of the unit is ensured. Taking the running angle of the unit at the existing stationary blade of 62 degrees as an example, the running working condition point M (Q, epsilon) of the unit in a flow-pressure ratio graph is obtained through the inlet-outlet pressure ratio epsilon, the volume flow Q and the running rotating speed n which are obtained by the feedback of the unit working condition monitoring unit, and if the M point is positioned on the lower right side of the anti-surge warning line, the unit is in a stable running working condition. If the M point is positioned at the upper left side of the anti-surge warning line, the central control valve sends an instruction to the anti-surge control unit, a main control object, namely a quick-opening valve, positioned in the bypass loop is quickly opened, the flow Q of the compressor unit is increased, the pressure ratio epsilon is reduced, the unit operation working condition point M is pulled back to the anti-surge warning line, and stable operation of the unit is ensured.
Referring to fig. 3, a certain continuous wind tunnel is provided with bypass loops at the inlet and outlet of the unit and is controlled by a quick-opening valve. When the central controller judges that the unit operating condition is continuously located in the anti-surge warning line, the central controller sends an instruction to control the anti-surge control unit to act, the bypass pipeline quick-opening valve is quickly opened, the unit inlet flow is increased, the unit inlet-outlet pressure ratio is reduced, and the unit is ensured to be far away from a surge interval.
FIG. 4 shows the surge line data of the stator blade angle 50 degrees obtained by the interpolation of the present invention and the actually measured surge line data. The vane angles 40 °, 62 °, 79 ° are the actual measurement surge point data, and the basic data thereof are (θ)40，Q40-1，ε40-1，n1)、(θ40，Q40-2，ε40-2，n2)、(θ40，Q40-3，ε40-3，n3)、(θ40，Q40-4，ε40-4，n4)……，(θ62，Q62-1，ε62-1，n1)、(θ62，Q62-2，ε62-2，n2)、(θ62，Q62-3，ε62-3，n3)、(θ62，Q62-4，ε62-4，n4)……，(θ79，Q79-1，ε40-1，n1)、(θ79，Q79-2，ε79-2，n2)、(θ79，Q79-3，ε79-3，n3)、(θ79，Q79-4，ε79-4，n4) … …, respectively; when the unit operates under the condition that the rest stator blade angles theta are 50 degrees, the central controller respectively calculates the flow-pressure ratio data of each corresponding rotating speed through the existing actually-measured surge line data of the stator blades of 40 degrees and 62 degrees by an interpolation calculation formula to obtain (theta)50，Q50-1，ε50-1，n1)、(θ50，Q50-2，ε50-2，n2)、(θ50，Q50-3，ε50-3，n3)、(θ50，Q50-4，ε50-4，n4) … …, this data plots a surge line for a vane angle θ of 50 °.
The result shows that the method disclosed by the invention is accurate and reliable; and reserving a safety margin of 5-10% according to the calculated surge line, setting an anti-surge warning line, monitoring the running state of the unit in real time, and ensuring that the unit is safely and stably operated under the real-time running working condition far away from the surge line of the unit. The proper measurement of the stationary blade angle surge line is added, the consistency of the stationary blade angle surge line obtained by calculation and the actually measured surge line is further improved, but the debugging time, the work, the cost and the like are increased.
The automatic control system for the anti-surge warning line of the axial flow compressor with the adjustable stationary blade can effectively reduce the debugging amount of the surge line of the unit, enlarge the angle range of the stationary blade which can stably run by the unit, switch and correct the anti-surge warning line in real time according to the running working condition and the angle of the stationary blade of the unit, and has safe and reliable results and great application prospect in wind tunnel occasions requiring the enlargement of the running range of the axial flow fan in a stationary blade adjustable mode. The application field of the axial flow fan can be expanded to other industrial application occasions using the stationary blade to expand the operation condition of the axial flow fan in an adjustable mode.
Claims (1)
1. An anti-surge system of an axial flow compressor with adjustable wind tunnel stator blades and adopting interpolation operation comprises a central controller, an anti-surge control unit, a stator blade adjusting mechanism, a monitoring unit and a rotating speed control unit; the monitoring unit monitors the flow, the angle of the stationary blade, the pressure ratio and the temperature of the compressor unit, and the rotating speed control unit controls the rotating speed of the compressor unit; the anti-surge control unit is used for controlling a valve, the valve is arranged on a bypass loop between an inlet and an outlet of the compressor unit, and the valve can be quickly opened when the compressor unit has or is close to an anti-surge warning line, so that the flow of the inlet of the compressor unit is increased, and the pressure ratio of the inlet and the outlet of the compressor unit is reduced; the method is characterized in that: the stator blade adjusting mechanism comprises a stator blade adjusting cylinder, a rack, a servo motor, a helical gear, a support shaft, a plurality of stator blade sliding blocks and a plurality of stator blade cranks, wherein the stator blade adjusting cylinder is arranged outside a stator blade shell, the stator blade adjusting cylinder is arranged on the support shaft, the support shaft is used for supporting the stator blade adjusting cylinder and can ensure the axial movement of the stator blade adjusting cylinder, the rack is fixed on the stator blade adjusting cylinder, an output shaft of the servo motor is connected with the helical gear through a speed reducer, the helical gear is meshed with the rack, the stator blade sliding blocks are arranged in an annular groove of the stator blade adjusting cylinder, the sliding blocks can slide in the groove, each stator blade sliding block is connected with one end of one stator blade crank, each stator blade is fixedly connected with the other end of the stator blade crank at the corresponding position, and when the stator blade adjusting cylinder axially moves, all the stator blade sliding blocks axially move along with the stator blade adjusting cylinder to drive all the, all the static blades rotate along with the static blade cranks at the same time, and the running angles of the static blades are adjusted in real time when the unit runs;
the central controller obtains an actual operation working condition point of the compressor unit by utilizing data of the angle, flow, pressure ratio and temperature of the static blade measured in the operation process of the compressor unit through calculation, compares the operation working condition point with a set anti-surge warning line of the angle of the static blade, and controls the anti-surge control unit to act when the operation working condition point of the compressor unit continuously operates outside the anti-surge warning line so as to ensure that the compressor unit is far away from a surge interval;
the surge line data of the angle of the existing static blade is utilized to obtain the surge line data of the angle not measured through interpolation operation, so that the surge-proof warning line is set, the compressor unit is allowed to operate under the static blade angle without actually measuring the surge line data, meanwhile, the operation condition of the axial flow compressor unit is monitored in real time, the surge-proof warning line is automatically switched, the temperature of the surge-proof warning line is corrected according to the operation condition of the compressor unit, and the compressor unit is ensured to safely and stably operate in the surge-proof warning line,
wherein the angle of the stator blade of the finished unit is theta1、θ2、θ3… …, in the format of (theta)1，Q1-1，ε1-1，n1)、(θ1，Q1-2，ε1-2，n2)、(θ1，Q1-3，ε1-3，n3)、(θ1，Q1-4，ε1-4，n4)……，(θ2，Q2-1，ε2-1，n1)、(θ2，Q2-2，ε2-2，n2)、(θ2，Q2-3，ε2-3，n3)、(θ2，Q2-4，ε2-4，n4)……，(θ3，Q3-1，ε3-1，n1)、(θ3，Q3-2，ε3-2，n2)、(θ3，Q3-3，ε3-3，n3)、(θ3，Q3-4，ε3-4，n4) … …, respectively; for static blade angle thetaxIf theta1＜θx＜θ2Then the stator blade angle is different with the rotation speed nmSurge point data (θ) of (1, 2, 3, 4 … …)x，Qx-m，εx-m，nm) Calculated by the following interpolation formula:
obtaining a static blade angle theta through calculationxDifferent rotational speeds nm(m is 1, 2, 3, 4 … …) corresponding surge point data (θ)x，Qx-1，εx-1，n1)、(θx，Qx-2，εx-2，n2)、(θx，Qx-3，εx-3，n3)、(θx，Qx-4，εx-4，n4)……；
Wherein,
theta is the angle of the stator blade of the compressor unit,
θp(p is 1, 2, 3, 4 … …) is the different stator blade angles of the unit;
n is the rotating speed of the compressor set,
nm(m is 1, 2, 3, 4 … …) is the different rotating speeds of the unit;
q is the inlet volume flow of the compressor set,
Qp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmThe flow rate of (a);
epsilon is the inlet-outlet pressure ratio of the compressor unit,
εp-m(p is 1, 2, 3, 4 … …; m is 1, 2, 3, 4 … …) is the compressor set vane angle θpRotational speed nmPressure ratio of (d).
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