Turbine guider exhaust area measurement system and calibration and measurement method

Abstract

The invention belongs to the field of turbine guider design, and particularly relates to a turbine guider exhaust area measurement system, calibration and measurement method, which comprises a measurement and control system, an equipment main body and a test section, the measurement and control system comprises an upper computer, data acquisition equipment and a controller; the data acquisition equipment and the controller are electrically connected with the upper computer; the equipment main body comprises a variable frequency motor, a fan and a closed container; the variable frequency motor is electrically connected with the controller and mechanically connected with the fan, and the variable frequency motor is used for providing power for the fan; the closed container is used for blowing the test section at a low speed; one end of the closed container is an air inlet end and is connected with the fan; and the other end is an exhaust end for installing the test section. Measurement steps and parameters are few, the measurement process is simple, the measurement workload is greatly reduced, only one hour is needed from beginning to completion of measurement, and the measurement efficiency is high; only a fan is needed to provide an air source slightly higher than the atmospheric pressure, a high-pressure air source is not needed, and the measurement period is short.

Description

Technical Field

[0001] The present application belongs to the field of turbine guide vane design, and in particular relates to a turbine guide vane exhaust area measurement system, calibration and measurement method. Background Art

[0002] For aircraft turbine engines, the turbine guide vane is a key component that determines important parameters such as engine flow and power. Analysis shows that the exhaust area of ​​the guide vane can significantly affect engine slip, surge margin, exhaust temperature and other characteristics, thereby affecting the performance of the entire engine. It is an important parameter that needs to be strictly controlled in engine design and production.

[0003] At present, the main testing methods for the exhaust area of ​​the guide are: geometric measurement method, water flow measurement method, and flow function test measurement method.

[0004] (1) Geometric measurement method: When measuring the guide vane area using a special measuring instrument or three-coordinate measuring equipment using the geometric measurement method, the dispersion and error of the measured guide vane area are difficult to meet actual needs due to factors such as poor repeatability of the measuring points on the turbine guide vane surface, large positioning errors in small arc segments, and unstable adjacent window structures. In addition, this method requires measurement of multiple positions of each blade flow channel. In order to ensure the accuracy of the measured area results, the positions and measuring points that need to be measured are very dense, the measurement workload is large, and the measurement cycle is long (usually it takes about a day to measure a guide vane).

[0005] (2) Water flow measurement method: During the measurement process of water flow measurement, the vortex generated by the flow of water on the liquid surface in the container is difficult to eliminate, making the liquid surface in the container difficult to stabilize, and the stability of the liquid surface in the container has a great influence on the measurement accuracy. The larger the area of ​​the guide, the more significant the instability of the liquid surface in the container during the test. Therefore, this method is mostly used to measure guides with smaller areas, and is not suitable for guides with larger areas.

[0006] (3) Flow function test measurement method: The flow function test measurement method requires the design of a special flow function test piece, as well as the assembly, transportation, stage preparation, and testing of the test piece. In addition, a stable high-pressure gas source is required. Therefore, the flow function test measurement method has problems such as high energy consumption, complex test piece design, large test preparation workload, and long test cycle (usually it takes about a week to measure a guide).

[0007] Therefore, how to quickly and cost-effectively measure the exhaust area of ​​the turbine guide vane is a problem that needs to be solved. Summary of the invention

[0008] The purpose of this application is to provide a turbine guide vane exhaust area measurement system, calibration and measurement method to solve the problems of large workload and long test cycle in the existing turbine guide vane exhaust area measurement.

[0009] The technical solution of the present application is: a turbine guide vane exhaust area measurement system, including a measurement and control system, a device body and a test section; The measurement and control system includes a host computer, a data acquisition device and a controller; the data acquisition device and the controller are electrically connected to the host computer; the equipment body includes a variable frequency motor, a fan and a closed container; the variable frequency motor is electrically connected to the controller, the variable frequency motor is mechanically connected to the fan, and the variable frequency motor is used to provide power to the fan; the closed container is used to blow air to the test section at a low speed; one end of the closed container is an air inlet end, which is connected to the fan; the other end is an exhaust end, which is used to install the test section, and the test section includes a turbine guide or a standard throttling device under test; the fan is provided with a speed sensor connected to the data acquisition device, and the closed container is provided with a temperature sensor and a pressure sensor connected to the data acquisition device; a rectifier grid is provided in the closed container.

[0010] Preferably, the air supply flow rate and rotation speed of the selected fan are in a linear relationship.

[0011] Preferably, a control program is provided in the host computer, and a set value is stored in the control program. The set value is the calibrated container pressure difference. When the pressure difference between the inside of the closed container and the external atmospheric environment reaches and stabilizes at the set value of the control program, the collected pressure difference and fan speed are recorded and stored.

[0012] As a specific implementation, a method for calibrating the exhaust area of ​​a turbine guide vane includes: Step 1, estimating the exhaust area of ​​the turbine guide vane to be measured, selecting two sets of standard throttles with known areas, so that the exhaust area of ​​the turbine guide vane to be measured is between the areas of the two selected standard throttles; Step 2, select one set of standard throttling components and install it at the exhaust end of the closed container; Step 3, in the control program of the upper computer, the area value of the standard throttling device installed is given, and the pressure difference control value between the pressure inside the container and the external atmospheric environment is set; Step 4: The controller controls the frequency conversion motor to start according to the control program command of the host computer, drives the fan to operate, and supplies air into the closed container to establish a pressure difference between the inside of the closed container and the external atmospheric environment; Step 5: The data acquisition device collects the fan speed, the pressure difference between the inside of the sealed container and the external atmospheric environment, and the gas temperature in the sealed container in real time, and sends them to the control program of the host computer; Step 6: The host computer compares the collected pressure difference with the pressure difference control value, and controls the speed of the variable frequency motor and the fan to make the pressure difference between the inside of the closed container and the external atmospheric environment between the pressure difference control value; Step 7, when the difference between the pressure difference between the inside of the closed container and the external atmospheric environment and the pressure difference control value set by the control program is less than the set threshold and stabilizes for the set time, the control program of the host computer starts to record the collected speed, pressure difference, and temperature results; Step 8, setting the frequency of recording and collecting data by the control program to the number of groups of collected data per unit time, stopping the collection when the recorded collected data reaches the set number of groups, and controlling the variable frequency motor to stop running; Step 9, the control program of the upper computer processes the collected set number of data, gives a distribution curve of the results, and determines whether to store the results in the control program. If not, restart from step 3. If yes, the control program stores the processing results and the area of ​​the corresponding standard throttling device in the control program, and prompts to install the next standard throttling device; Step 10, installing the next standard throttling device at the exhaust end of the closed container; Step 11, repeat the above steps 3 to 9, and determine whether to store the results in the control program. If not, start again from step 3. If yes, the control program stores the processing results and the area of ​​the corresponding standard throttling device in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

[0013] Preferably, the set time is 10s, the set number of groups is 200 groups, and the set threshold is ±1%.

[0014] Preferably, when the deviation between the pressure difference between the inside of the closed container and the external atmospheric environment and the pressure difference control value exceeds a set threshold, the control program stops recording and adjusts the rotation speed until the pressure difference between the inside of the closed container and the external atmospheric environment and the pressure difference control value are less than the set threshold and last for a set time, and then the control program re-records and collects data.

[0015] As a specific implementation, a method for measuring the exhaust area of ​​a turbine guide vane includes: Step 1, installing the turbine guide to be tested at the exhaust end of the closed container; Step 2, in the control program of the host computer, the pressure difference between the inside of the closed container and the external atmospheric environment to be controlled is given, and the pressure difference given in the control program is kept consistent with the pressure difference control value given during calibration; Step 3: The controller inputs commands according to the control program of the host computer, controls the frequency conversion motor to start, drives the fan to operate, and supplies air to the closed container to establish a pressure difference between the inside of the closed container and the external atmospheric environment; Step 4: The data acquisition device collects the fan speed, the pressure difference between the inside of the closed container and the external atmospheric environment, and the gas temperature in the closed container, and sends them to the control program of the host computer; Step 5: The host computer compares the collected pressure difference with the pressure difference given by the control program, and controls the speed of the motor and the fan so that the difference between the pressure difference inside the closed container and the external atmospheric environment and the pressure difference control value is less than the set threshold value; Step 6, when the deviation between the pressure difference and the pressure difference control value given by the control program is less than the set threshold and is stable for 10 seconds, the control program of the host computer starts to record the collected speed, pressure difference, and temperature results; when the deviation between the pressure difference and the pressure difference control value given by the control program is greater than the set threshold, the control program stops recording, and when the pressure difference and the pressure difference given by the control program are less than the set threshold again and continue for the set time, the control program starts to continue recording the collected data; Step 7, the control program records the collected data at a frequency of 10 times per second, and stops collecting when the recorded collected data reaches the set number of groups, and controls the motor to stop running; Step 8, the control program of the host computer processes the collected set number of data and the calibration data, calculates the area of ​​the guide, and saves and outputs the processing results together with the corresponding collected set number of data and calibration results.

[0016] Preferably, the set time is 10s, the set number of groups is 200 groups, and the set threshold is ±1%.

[0017] The turbine guide vane exhaust area measurement system, calibration and measurement method of the present application have the following advantages: 1. There are few measurement steps and parameters, and the measurement process is simple, which greatly reduces the workload of measurement. It only takes about 1 hour from the beginning to the completion of the measurement, and the measurement efficiency is high; 2. The fan only needs to provide a gas source slightly higher than the atmospheric pressure (the pressure difference is only about a few hundred Pa), and no high-pressure gas source is required. The measurement cycle is short, which greatly reduces energy consumption and significantly reduces measurement costs; 3. There are few parameters that affect the measurement results, and the stability and accuracy of the measurement results are easy to ensure; 4. It has a wide range of applications and can measure the exhaust area of ​​turbine guide vanes of various models and area levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0019] Figure 1 This is a schematic diagram of the overall structure of the turbine guide vane exhaust area measurement system of this application; Figure 2 This is a schematic diagram of the overall process of the turbine guide vane exhaust area measurement method of this application.

[0020] 1. Host computer; 2. Data acquisition equipment; 3. Controller; 4. Frequency conversion motor; 5. Fan; 6. Speed ​​sensor; 7. Sealed container; 8. Rectifier grid; 9. Pressure sensor; 10. Standard throttling device. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] For a closed container, under the condition of low-speed incompressible gas steady-state flow, the pressure in the closed container is kept constant. According to the flow continuity principle, the gas flow rate flowing into the container inlet is continuous (equal) with the gas flow rate flowing out of the container outlet (discharged into the atmosphere), that is, the fan flow rate supplied to the closed container is equal to the outflow flow rate of the turbine guide installed at the closed container outlet. Then the area of ​​the guide is in a certain functional relationship with the speed of the fan. By establishing this functional relationship and measuring the speed of the fan, the exhaust area of ​​the guide can be calculated. It can be widely used for fast, low-cost and effective measurement of the exhaust area of ​​high- and low-pressure turbine guides of different models of engines.

[0023] Based on this, a turbine guide vane exhaust area measurement system is designed. Figure 1 As shown, it includes the measurement and control system, the equipment body and the test section.

[0024] The measurement and control system includes a host computer 1, a data acquisition device 2 and a controller 3; the data acquisition device 2 and the controller 3 are both electrically connected to the host computer 1; the device body includes a variable frequency motor 4, a fan 5 and a closed container 7. The variable frequency motor 4 is electrically connected to the controller 3, and the variable frequency motor 4 is mechanically connected to the fan 5, and the variable frequency motor 4 is used to provide power to the fan 5; the closed container 7 is used to blow air to the test section at a low speed. One end of the closed container 7 is the air inlet end, which is connected to the fan 5; the other end is the exhaust end, which is used to install the test section, and the test section includes a turbine guide or a standard throttling device 10 to be tested. The fan 5 is provided with a speed sensor 6 connected to the data acquisition device 2, and the closed container 7 is provided with a temperature sensor and a pressure sensor 9 connected to the data acquisition device 2.

[0025] A rectifying grid 8 is provided in the sealed container 7, and the rectifying grid 8 is used to reduce the turbulence in the sealed container 7, make the flow field in the sealed container 7 uniform, and reduce the pressure fluctuation in the sealed container 7. The temperature sensor and the pressure sensor 9 are used to measure the pressure difference between the inside of the sealed container 7 and the atmospheric environment and the temperature of the gas in the container.

[0026] The fan 5 is used to supply air to the sealed container 7 so as to establish a stable pressure difference between the inside of the sealed container 7 and the external atmospheric environment. A fan 5 having a linear relationship between the air supply flow rate and the rotation speed is selected.

[0027] The speed of the variable frequency motor 4 is adjustable, and the power should meet the working requirements of the fan 5. The speed sensor 6 is used to measure the speed of the fan 5. The data acquisition device 2 is used to collect the speed of the fan 5, the pressure difference between the inside of the closed container 7 and the external atmospheric environment, and the gas temperature in the container, and transmit the collected signal to the host computer 1. According to the instructions issued by the host computer 1, the controller 3 controls the variable frequency motor 4 to stably maintain the pressure difference between the inside of the closed container 7 and the external atmospheric environment at the given value of the host computer 1.

[0028] The host computer 1 is provided with a control program, which controls the entire system, processes data, saves and outputs the results. The control program stores set values. When the pressure difference between the inside of the closed container 7 and the external atmospheric environment reaches and stabilizes at the set value of the control program, the collected pressure difference and the speed of the fan 5 are recorded and stored, and the results are processed according to the pressure difference and speed to give the exhaust area measurement results of the measured turbine guide or standard throttle 10. The standard throttle is used to calibrate and calibrate the system.

[0029] The specific working process is: First, two sets of standard throttling devices with known areas are installed at the outlet of the density container (standard throttling devices can be standard orifice plates, standard nozzles, standard guides, etc.), and the frequency conversion motor 4 drives the fan 5 to work, and the system is calibrated. After the calibration is completed, the pressure difference control value is obtained, and the pressure difference control value is the container pressure difference set by the calibration.

[0030] The variable frequency motor 4 drives the fan 5 again to send the gas into the closed container 7. The turbine guide device to be measured is installed at the outlet of the closed container 7. The speed of the fan 5 is controlled by the controller 3 to keep the pressure difference between the static pressure in the closed container 7 and the external atmospheric pressure as the pressure difference control value. The exhaust area of ​​the turbine guide device to be measured is a function of the fan speed. The exhaust area of ​​the guide device can be calculated based on the system calibration data and the measurement result of the fan 5 speed.

[0031] Through the above design, the exhaust area measurement of the turbine guide vane can be completed accurately and quickly, and the measurement workload is small.

[0032] As a specific embodiment, based on the above measurement system, a method for calibrating the exhaust area of ​​a turbine guide vane is also included, which adopts the above measurement system and specifically includes the following steps: Step 1, estimate the exhaust area of ​​the turbine guide vane to be measured, select two sets of standard throttle members 10 with known areas, and make the exhaust area of ​​the turbine guide vane to be measured between the areas of the two selected standard throttle members 10.

[0033] Step 2, select one set of standard throttling components 10 and install it on the exhaust end of the closed container 7.

[0034] Step 3, in the control program of the upper computer 1, the area value of the installed standard throttling device 10 is given, and the pressure difference control value between the pressure inside the container and the external atmospheric environment is set.

[0035] Step 4, the controller 3 controls the frequency conversion motor 4 to start according to the control program command of the host computer 1, drives the fan 5 to operate, and supplies air into the closed container 7 to establish a pressure difference between the inside of the closed container 7 and the external atmospheric environment.

[0036] Step 5, the data acquisition device 2 collects the rotation speed of the fan 5, the pressure difference between the inside of the closed container 7 and the external atmospheric environment, and the gas temperature in the container in real time, and sends them to the control program of the host computer 1.

[0037] Step 6: The host computer 1 compares the collected pressure difference with the pressure difference control value, and controls the speed of the variable frequency motor 4 and the fan 5 so that the difference between the pressure difference inside the closed container 7 and the external atmospheric environment and the pressure difference control value is less than a set threshold value. The set threshold value is ±1%.

[0038] Specifically, when the collected pressure difference is less than the pressure difference control value, the speed of the fan 5 is increased; when the collected pressure difference is greater than the pressure difference control value, the speed of the fan 5 is reduced.

[0039] Step 7, when the difference between the pressure difference between the inside of the closed container 7 and the external atmospheric environment and the pressure difference control value set by the control program is less than the set threshold and stabilizes for 10 seconds, the control program of the host computer 1 starts to record the collected speed, pressure difference, and temperature results.

[0040] When the deviation between the pressure difference between the inside of the closed container 7 and the external atmospheric environment and the pressure difference control value exceeds the set threshold, the control program stops recording and adjusts the rotation speed until the pressure difference between the inside of the closed container 7 and the external atmospheric environment and the pressure difference control value are less than ±1% and stabilized for 10 seconds. Then the control program re-records and collects data.

[0041] Step 8, the control program records the collected data at a frequency of 10 times per second. When the number of recorded collection groups reaches 200 groups, the collection is stopped and the variable frequency motor 4 is controlled to stop running.

[0042] Step 9, the control program of the upper computer 1 processes the 200 sets of collected data, gives a distribution curve of the results, and determines whether to store the results in the control program. If not, start again from step 3. If not, the control program stores the processing results and the area of ​​the corresponding standard throttling device 10 in the control program, and prompts to install the next standard throttling device 10.

[0043] The criterion for determining whether to store the result in the control program is: determining the distribution law of the distribution curve of the result, and if the distribution law is determined to be the same as the distribution law of the standard turbine guide vane distribution curve, storing it in the control program.

[0044] Step 10, installing the next standard throttling device 10 at the exhaust end of the closed container 7.

[0045] Step 11, repeat the above steps 3 to 9, and determine whether to store the results in the control program. If not, start again from step 3. If so, the control program stores the processing results and the area of ​​the corresponding standard throttling device 10 in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

[0046] As a specific implementation, based on the above measurement system, a method for measuring the exhaust area of ​​a turbine guide vane is also included, using the above measurement system, such as Figure 2 As shown, the specific steps include: Step 1, installing the turbine guide to be tested at the exhaust end of the closed container 7; Step 2, in the control program of the host computer 1, a pressure difference between the inside of the closed container 7 and the external atmospheric environment to be controlled is given, and the pressure difference given in the control program is kept consistent with the pressure difference control value given during calibration; Step 3, the controller 3 inputs commands according to the control program of the host computer 1, controls the variable frequency motor 4 to start, drives the fan 5 to operate, and supplies air to the sealed container 7, so that a pressure difference is established between the inside of the sealed container 7 and the external atmospheric environment; Step 4, the data acquisition device 2 collects the rotation speed of the fan 5, the pressure difference between the inside of the closed container 7 and the external atmospheric environment, and the gas temperature in the container, and sends them to the control program of the host computer 1; Step 5, the host computer 1 compares the collected pressure difference with the pressure difference given by the control program, and controls the speed of the motor and the fan 5 so that the difference between the pressure difference inside the closed container 7 and the external atmospheric environment and the pressure difference control value is less than the set threshold value; Step 6, when the pressure difference is consistent with the pressure difference control value given by the control program (a deviation of no more than ±1% is allowed) and is stable for 10 seconds, the control program of the host computer 1 starts to record the collected speed, pressure difference, and temperature results. When the pressure difference deviates from the pressure difference control value given by the control program by more than ±1%, the control program stops recording. When the pressure difference is consistent with the pressure difference given by the control program again and is stable for 10 seconds, the control program starts to continue recording the collected data; Step 7, the control program records the collected data at a frequency of 10 times per second, and stops collecting when the recorded collected data reaches 200 groups, and controls the motor to stop running; Step 8, the control program of the host computer 1 processes the 200 sets of collected data and the calibrated data, calculates the area of ​​the guide, and saves and outputs the processing results together with the corresponding 200 sets of collected data and the calibration results.

[0047] In summary, this application has the following advantages: 1. There are few measurement steps and parameters, and the measurement process is simple, which greatly reduces the workload of measurement. It only takes about 1 hour from the beginning to the completion of the measurement, and the measurement efficiency is high; 2. The fan only needs to provide a gas source slightly higher than the atmospheric pressure (the pressure difference is only about a few hundred Pa), and no high-pressure gas source is required. The measurement cycle is short, which greatly reduces energy consumption and significantly reduces measurement costs; 3. There are few parameters that affect the measurement results, and the stability and accuracy of the measurement results are easy to ensure; 4. It has a wide range of applications and can measure the exhaust area of ​​turbine guide vanes of various models and area levels.

[0048] Finally, it should be noted that: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A turbine guide vane exhaust area measurement system, characterized in that: It includes measurement and control system, equipment body and test section; The measurement and control system comprises a host computer (1), a data acquisition device (2) and a controller (3); the data acquisition device (2) and the controller (3) are both electrically connected to the host computer (1); the device body comprises a variable frequency motor (4), a fan (5) and a closed container (7); the variable frequency motor (4) is electrically connected to the controller (3), the variable frequency motor (4) is mechanically connected to the fan (5), and the variable frequency motor (4) is used to provide power to the fan (5); the closed container (7) is used to measure the measurement and control system. The test section is blown at a low speed; one end of the closed container (7) is an air inlet end connected to a fan (5); the other end is an exhaust end for installing the test section, the test section includes a turbine guide or a standard throttle (10) to be tested; the fan (5) is provided with a speed sensor (6) connected to a data acquisition device (2); the closed container (7) is provided with a temperature sensor and a pressure sensor (9) connected to the data acquisition device (2); the closed container (7) is provided with a rectifier grid (8).

2. The turbine guide vane exhaust area measurement system according to claim 1, characterized in that: The air supply flow rate and rotation speed of the selected fan (5) are in a linear relationship.

3. The turbine guide vane exhaust area measurement system according to claim 1, characterized in that: The host computer (1) is provided with a control program, and a set value is stored in the control program. The set value is a calibrated container pressure difference. When the pressure difference between the inside of the closed container (7) and the external atmospheric environment reaches and stabilizes at the set value of the control program, the collected pressure difference and fan speed are recorded and stored.

4. A method for calibrating the exhaust area of ​​a turbine guide vane, using the measurement system according to any one of claims 1 to 3, characterized in that: include: Step 1, estimating the exhaust area of ​​the turbine guide vane to be measured, selecting two sets of standard throttle members (10) with known areas, so that the exhaust area of ​​the turbine guide vane to be measured is between the areas of the two sets of standard throttle members (10) selected; Step 2, selecting one set of standard throttling components (10) and installing it on the exhaust end of the closed container (7); Step 3, in the control program of the host computer (1), the area value of the installed standard throttling device (10) is given, and the pressure difference control value between the pressure inside the container and the external atmospheric environment is set; Step 4, the controller (3) controls the frequency conversion motor (4) to start according to the control program command of the host computer (1), drives the fan (5) to operate, and supplies air into the closed container (7), so that a pressure difference is established between the inside of the closed container (7) and the external atmospheric environment; Step 5, the data acquisition device (2) collects the fan speed, the pressure difference between the inside of the closed container (7) and the external atmospheric environment, and the gas temperature in the closed container (7) in real time, and sends them to the control program of the host computer (1); Step 6, the upper computer (1) compares the collected pressure difference with the pressure difference control value, and controls the rotation speed of the variable frequency motor (4) and the fan (5) so that the difference between the pressure difference inside the closed container (7) and the external atmospheric environment and the pressure difference control value is less than a set threshold value; Step 7, when the difference between the pressure difference between the inside of the closed container (7) and the external atmospheric environment and the pressure difference control value set by the control program is less than the set threshold and stabilizes for a set time, the control program of the host computer (1) starts to record the collected speed, pressure difference, and temperature results; Step 8, setting the frequency of recording the collected data by the control program to the number of groups of collected data per unit time, stopping the collection when the recorded collected data reaches the set number of groups, and controlling the variable frequency motor (4) to stop running; Step 9, the control program of the upper computer (1) processes the collected set number of data, gives a distribution curve of the results, and determines whether to store the results in the control program. If not, restart from step 3. If yes, the control program stores the processing results and the area of ​​the corresponding standard throttling device (10) in the control program, and prompts to install the next standard throttling device (10); Step 10, installing the next standard throttling device (10) at the exhaust end of the closed container (7); Step 11, repeat the above steps 3 to 9, and determine whether to store the results in the control program. If not, start again from step 3. If yes, the control program stores the processing results and the area of ​​the corresponding standard throttling device (10) in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

5. The method for calibrating the exhaust area of ​​a turbine guide vane according to claim 4, characterized in that: The set time is 10s, the set number of groups is 200 groups, and the set threshold is ±1%.

6. The method for calibrating the exhaust area of ​​a turbine guide vane according to claim 5, characterized in that: When the pressure difference between the inside of the sealed container (7) and the external atmospheric environment and the pressure difference control value deviate from the set threshold, the control program stops recording and adjusts the rotation speed until the pressure difference between the inside of the sealed container (7) and the external atmospheric environment and the pressure difference control value are less than the set threshold and last for a set time, and then the control program re-records and collects data.

7. A method for measuring the exhaust area of ​​a turbine guide vane, using the measurement system according to any one of claims 1 to 3, characterized in that: include: Step 1, installing the turbine guide to be tested at the exhaust end of the closed container (7); Step 2, in the control program of the host computer (1), a pressure difference between the inside of the closed container (7) and the external atmospheric environment to be controlled is given, and the pressure difference given in the control program is kept consistent with the pressure difference control value given during calibration; Step 3, the controller (3) controls the variable frequency motor (4) to start according to the control program input command of the host computer (1), drives the fan (5) to operate, and supplies air to the closed container (7), so that a pressure difference is established between the inside of the closed container (7) and the external atmospheric environment; Step 4, the data acquisition device (2) acquires the fan speed, the pressure difference between the inside of the closed container (7) and the external atmospheric environment, and the gas temperature in the closed container (7), and sends them to the control program of the host computer (1); Step 5, the upper computer (1) compares the collected pressure difference with the pressure difference given by the control program, and controls the rotation speed of the motor and the fan (5) so that the difference between the pressure difference inside the closed container (7) and the external atmospheric environment and the pressure difference control value is less than a set threshold value; Step 6, when the deviation between the pressure difference and the pressure difference control value given by the control program is less than the set threshold and is stable for 10 seconds, the control program of the host computer (1) starts to record the collected speed, pressure difference, and temperature results; when the deviation between the pressure difference and the pressure difference control value given by the control program is greater than the set threshold, the control program stops recording, and when the deviation between the pressure difference and the pressure difference given by the control program is less than the set threshold again and lasts for the set time, the control program starts to continue recording the collected data; Step 7, the control program records the collected data at a frequency of 10 times per second, and stops collecting when the recorded collected data reaches the set number of groups, and controls the motor to stop running; Step 8, the control program of the host computer (1) processes the collected set number of data and the calibration data, calculates the area of ​​the guide, and saves and outputs the processing result together with the corresponding collected set number of data and the calibration result.

8. The method for measuring the exhaust area of ​​a turbine guide vane according to claim 7, characterized in that: The set time is 10s, the set number of groups is 200 groups, and the set threshold is ±1%.

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