A turbine guide vane exhaust area measurement system, calibration and measurement method

Abstract

This application belongs to the field of turbine guide vane design, and particularly relates to a turbine guide vane exhaust area measurement system, calibration and measurement method, which includes a measurement and control system, an equipment main body and a test section; the measurement and control system includes a host computer, a data acquisition device and a controller; both the data acquisition device and the controller are electrically connected to the host computer; the equipment main body includes a variable frequency motor, a fan and a sealed container; the variable frequency motor is electrically connected to the controller, and the variable frequency motor is mechanically connected to the fan, and the variable frequency motor is used to provide power for the fan; the sealed container is used to blow air at a low speed to the test section; one end of the sealed container is the air inlet end, which is connected to the fan; the other end is the exhaust end, which is used to install the test section. The number of measurement steps and parameters is small, and the measurement process is simple, greatly reducing the measurement workload. It only takes about 1 hour from the start to the completion of the measurement, and the measurement efficiency is high; only a gas source slightly higher than the atmospheric pressure needs to be provided by the fan, and no high-pressure gas source is required, 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 guide vane exhaust area can significantly affect engine characteristics such as slip, surge margin, and exhaust temperature, thereby affecting overall engine performance. It is a critical parameter that requires strict control during 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:

[0005] When measuring the guide vane area using a dedicated measuring instrument or three-dimensional 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 blade surface, large positioning errors in small arc segments, and unstable adjacent window structures. In addition, this method requires measurement at multiple locations on each blade cascade flow channel. To ensure the accuracy of the measured area results, the positions and measuring points that need to be measured are very close together, resulting in a large measurement workload and a long measurement cycle (usually it takes about a day to measure a guide vane).

[0006] (2) Water flow measurement method:

[0007] During the water flow measurement process, the vortex generated by the water flow on the liquid surface within the container is difficult to eliminate, making the liquid surface unstable. The stability of the liquid surface within the container has a significant impact on measurement accuracy. The larger the guide area, the more significant the instability of the liquid surface during the test. Therefore, this method is mostly used to measure guides with smaller areas and is not suitable for guides with larger areas.

[0008] (3) Flow function test measurement method:

[0009] The flow function test measurement method requires the design of a special flow function test piece, as well as the assembly, transportation, preparation for the test piece, and testing. 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).

[0010] 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

[0011] The purpose of this application is to provide a measurement system, calibration and measurement method for the exhaust area of a turbine guide vane, so as to solve the problems of large workload and long test cycle in the measurement of the exhaust area of the existing turbine guide vane.

[0012] The technical solution of this application is: a measurement system for the exhaust area of a turbine guide vane, including a measurement and control system, a device main body and a test section;

[0013] The measurement and control system includes a host computer, a data acquisition device and a controller; the data acquisition device and the controller are both electrically connected to the host computer; the device main body includes a variable-frequency motor, a fan and a sealed 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 for the fan; the sealed container is used to blow air at a low speed to the test section; one end of the sealed container is the air inlet end, which is connected to the fan; the other end is the exhaust end, which is used to install the test section, and the test section includes the turbine guide vane to be measured or a standard throttle element; a speed sensor connected to the data acquisition device is provided on the fan, and a temperature sensor and a pressure sensor connected to the data acquisition device are provided in the sealed container; a rectifying grid is provided in the sealed container.

[0014] Preferably, the air supply flow rate of the selected fan has a linear relationship with the rotational speed.

[0015] 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 container pressure difference set for calibration. When the pressure difference between the inside of the sealed container and the external atmospheric environment reaches and stabilizes at the set value of the control program, the collected pressure difference and the rotational speed of the fan are recorded and stored.

[0016] As a specific implementation manner, a calibration method for the exhaust area of a turbine guide vane includes:

[0017] Step 1, estimate the exhaust area of the turbine guide vane to be measured, select two sets of standard throttle elements with known areas, and make the exhaust area of the turbine guide vane to be measured fall between the areas of the two selected standard throttle elements;

[0018] Step 2, select one set of standard throttle elements and install them at the exhaust end of the sealed container;

[0019] Step 3, give the area value of the installed standard throttle element in the control program of the host computer, and set the pressure difference control value between the pressure inside the container and the external atmospheric environment;

[0020] Step 4, the controller controls the variable-frequency motor to start according to the command of the control program of the host computer, drives the fan to operate, supplies air into the sealed container, and establishes a pressure difference between the inside of the sealed container and the external atmospheric environment;

[0021] Step 5, the data acquisition device collects the fan speed, the pressure difference between the inside and the outside atmospheric environment of the sealed container, and the gas temperature inside the sealed container in real time, and sends them to the control program of the upper computer;

[0022] Step 6, the upper computer compares the magnitude of the collected pressure difference with the pressure difference control value, and controls the frequency conversion motor and the fan speed so that the pressure difference between the inside and the outside atmospheric environment of the sealed container is between the pressure difference control value;

[0023] Step 7, when the difference between the pressure difference between the inside and the outside atmospheric environment of the sealed container and the pressure difference control value set by the control program is less than the set threshold and remains stable after the set time, the control program of the upper computer starts to record the collected speed, pressure difference, and temperature results;

[0024] Step 8, set the frequency of the control program to record the collected data as the number of groups of data collected per unit time. When the recorded collected data reaches the set number of groups, stop the collection and control the frequency conversion motor to stop running;

[0025] Step 9, the control program of the upper computer processes the collected data of the set number of groups, gives the distribution curve of the results, and judges whether to store the results in the control program. If not, start from Step 3 again. If so, the control program stores the processed results and the area of the corresponding standard throttling element in the control program, and prompts to install the next standard throttling element;

[0026] Step 10, install the next standard throttling element at the exhaust end of the sealed container;

[0027] Step 11, repeat the above Steps 3 to 9, and judge whether to store the results in the control program. If not, start from Step 3 again. If so, the control program stores the processed results and the area of the corresponding standard throttling element in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

[0028] Preferably, the set time is 10 s, the set number of groups is 200 groups, and the set threshold is ±1%.

[0029] Preferably, when the deviation between the pressure difference between the inside and the outside atmospheric environment of the sealed container and the pressure difference control value exceeds the set threshold, the control program stops recording, adjusts the speed until the pressure difference between the inside and the outside atmospheric environment of the sealed container and the pressure difference control value is less than the set threshold and lasts for the set time, and then the control program records and collects data again.

[0030] As a specific implementation manner, a method for measuring the exhaust area of a turbine guide vane includes:

[0031] Step 1, install the turbine guide vane to be measured at the exhaust end of the sealed container;

[0032] Step 2: Set the pressure difference between the inside and the outside atmosphere of the sealed container to be controlled in the control program of the host computer, and keep the pressure difference set in the control program consistent with the pressure difference control value set during calibration.

[0033] Step 3: The controller controls the frequency conversion motor to start according to the command input by the control program of the host computer, drives the fan to operate, supplies air to the sealed container, and establishes a pressure difference between the inside and the outside atmosphere of the sealed container.

[0034] Step 4: The data acquisition device collects the fan speed, the pressure difference between the inside and the outside atmosphere of the sealed container, and the gas temperature inside the sealed container, and sends them to the control program of the host computer.

[0035] Step 5: The host computer compares the magnitude of the collected pressure difference with the pressure difference set by the control program, and by controlling the motor and fan speed, makes the difference between the pressure difference between the inside and the outside atmosphere of the sealed container and the pressure difference control value less than the set threshold.

[0036] Step 6: When the deviation between the pressure difference and the pressure difference control value set by the control program is less than the set threshold and remains 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 set by the control program is greater than the set threshold, the control program stops recording; when the deviation between the pressure difference and the pressure difference set 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.

[0037] Step 7: The control program records the collected data at a frequency of 10 times per second. When the set number of groups of each collected data is reached, the collection stops, and the motor is controlled to stop running.

[0038] Step 8: The control program of the host computer processes the collected data of the set number of groups and the calibrated data, calculates the area of the guide vane, and saves and outputs the processed results together with the corresponding collected data of the set number of groups and the calibration results.

[0039] Preferably, the set time is 10s, the set number of groups is 200 groups, and the set threshold is ±1%.

[0040] The turbine guide vane exhaust area measurement system, calibration, and measurement method of the present application have the following advantages:

[0041] 1. The measurement steps and parameters are few, the measurement process is simple, greatly reducing the measurement workload. It only takes about 1 hour from the start to the completion of the measurement, and the measurement efficiency is high.

[0042] 2. Only a gas source slightly higher than the atmospheric pressure (the pressure difference only needs to be about a few hundred pascals) needs to be provided by the fan, without a high-pressure gas source. The measurement period is short, greatly reducing the energy consumption and significantly reducing the measurement cost.

[0043] 3. There are few parameters affecting the measurement results, and the stability and accuracy of the measurement results are easy to ensure;

[0044] 4. It has a wide range of applications and can measure the exhaust area of turbine guide vanes of various models and various area levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions provided in this application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0046] Figure 1 is a schematic diagram of the overall structure of the exhaust area measurement system for the turbine guide vane of this application;

[0047] Figure 2 is a schematic diagram of the overall process of the exhaust area measurement method for the turbine guide vane of this application.

[0048] 1. Host computer; 2. Data acquisition device; 3. Controller; 4. Variable frequency motor; 5. Fan; 6. Rotation speed sensor; 7. Sealed container; 8. Rectifying grid; 9. Pressure sensor; 10. Standard throttle element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] For the sealed container, under the condition of steady-state flow of low-speed incompressible gas, keeping the pressure in the sealed container constant, according to the principle of flow continuity, the gas flow rate flowing into the container at the inlet is continuous (equal) to the gas flow rate flowing out of the container (discharged into the atmosphere) at the outlet, that is, the flow rate of the fan supplied to the sealed container is equal to the flow rate flowing out of the turbine guide vane installed at the outlet of the sealed container. Then, the area of the guide vane has a certain functional relationship with the rotation speed of the fan. By establishing this functional relationship and measuring the rotation speed of the fan, the exhaust area of the guide vane can be calculated. It can be widely applicable to the rapid and low-cost effective measurement of the exhaust areas of high- and low-pressure turbine guide vanes of different models of engines.

[0051] Based on this, a measurement system for the exhaust area of a turbine guide vane is designed, as Figure 1 shown, including a measurement and control system, an equipment main body, and a test section.

[0052] The measurement and control system includes a host computer 1, a data acquisition device 2, and a controller 3; both the data acquisition device 2 and the controller 3 are electrically connected to the host computer 1; the device body includes a variable-frequency motor 4, a fan 5, and a sealed 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 sealed container 7 is used to blow air at a low speed to the test section. One end of the sealed 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 measured turbine guide vane or a standard throttling element 10. A speed sensor 6 connected to the data acquisition device 2 is provided on the fan 5, and a temperature sensor and a pressure sensor 9 connected to the data acquisition device 2 are provided inside the sealed container 7.

[0053] A rectifying grid 8 is provided inside the sealed container 7. The rectifying grid 8 is used to reduce the turbulence intensity inside the sealed container 7, make the flow field inside the sealed container 7 uniform, and reduce the pressure fluctuation inside 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 gas temperature inside the container.

[0054] The fan 5 is used to supply air to the sealed container 7 to establish a stable pressure difference between the inside of the sealed container 7 and the external atmospheric environment, and a fan 5 with a linear relationship between the supplied air flow and the rotational speed is selected.

[0055] The rotational 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 rotational speed of the fan 5. The data acquisition device 2 is used to collect the rotational speed of the fan 5, the pressure difference between the inside of the sealed container 7 and the external atmospheric environment, and the gas temperature inside the container, and transmit the collected signals to the host computer 1. The controller 3, according to the instructions issued by the host computer 1, controls the variable-frequency motor 4 to stably maintain the pressure difference between the inside of the sealed container 7 and the external atmospheric environment at the given value of the host computer 1.

[0056] A control program is provided in the host computer 1, and the control program performs the control, data processing, result storage, and output of the entire system. The set values are stored in the control program. When the pressure difference between the inside of the sealed container 7 and the external atmospheric environment reaches and stabilizes at the set value of the control program, the collected pressure difference and the rotational speed of the fan 5, etc. are recorded and stored, and the results are processed according to the pressure difference and the rotational speed, and the exhaust area measurement result of the measured turbine guide vane or the standard throttling element 10 is given. The standard throttling element is used to calibrate and calibrate the system.

[0057] The specific working process is as follows:

[0058] First, select two sets of standard throttling elements with known areas and install them at the outlet of the density container (the standard throttling element can be a standard orifice plate, a standard nozzle, a standard guide vane, etc.). The variable-frequency motor 4 drives the fan 5 to work to calibrate the system. After the calibration is completed, the pressure difference control value is obtained, and the pressure difference control value is the container pressure difference set for calibration.

[0059] The variable-frequency motor 4 drives the fan 5 again to send gas into the sealed container 7. The measured turbine guide vane is installed at the outlet of the sealed container 7. By controlling the speed of the fan 5 through the controller 3 to keep the pressure difference between the static pressure in the sealed container 7 and the external atmospheric pressure at the pressure difference control value, the exhaust area of the measured turbine guide vane is a function of the fan speed. According to the system calibration data and the measurement result of the fan 5 speed, the exhaust area of the guide vane can be calculated.

[0060] Through the above design, the measurement of the exhaust area of the turbine guide vane can be completed accurately and quickly, and the measurement workload is small.

[0061] As a specific embodiment, based on the above measurement system, there is also a method for calibrating the exhaust area of the turbine guide vane. Using the above measurement system, it specifically includes the following steps:

[0062] Step 1, estimate the exhaust area of the measured turbine guide vane, select two sets of standard throttle parts 10 with known areas, and make the exhaust area of the measured turbine guide vane between the areas of the two selected standard throttle parts 10.

[0063] Step 2, select one set of standard throttle parts 10 and install them at the exhaust end of the sealed container 7.

[0064] Step 3, in the control program of the host computer 1, give the area value of the installed standard throttle part 10, and set the pressure difference control value between the pressure in the container and the external atmospheric environment.

[0065] Step 4, according to the control program command of the host computer 1, the controller 3 controls the variable-frequency motor 4 to start, drives the fan 5 to operate, supplies air into the sealed container 7, and establishes a pressure difference between the inside of the sealed container 7 and the external atmospheric environment.

[0066] Step 5, the data acquisition device 2 real-time collects the fan 5 speed, the pressure difference between the inside of the sealed 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.

[0067] Step 6, the host computer 1 compares the magnitude of the collected pressure difference with the pressure difference control value, controls the variable-frequency motor 4 and the fan 5 speed, so that the difference between the pressure difference between the inside of the sealed container 7 and the external atmospheric environment and the pressure difference control value is less than the set threshold. The set threshold is ±1%.

[0068] 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 decreased.

[0069] Step 7, when the difference between the pressure difference between the inside of the sealed 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 is stable for 10 seconds, the control program of the host computer 1 starts to record the collected speed, pressure difference, and temperature results.

[0070] When the deviation between the pressure difference between the inside and the outside of the sealed container 7 and the pressure difference control value exceeds the set threshold, the control program stops recording, adjusts the rotation speed until the pressure difference between the inside and the outside of the sealed container 7 and the pressure difference control value is less than ±1% and is stable for 10 seconds, and then the control program resumes recording and collecting data.

[0071] Step 8, the control program records the data collection frequency at 10 times per second. After the number of collected groups reaches 200 groups, the data collection stops, and the variable frequency motor 4 is controlled to stop running.

[0072] Step 9, the control program of the host computer 1 processes the 200 groups of collected data, gives the distribution curve of the results, and determines whether to store the results in the control program. If not, it starts from step 3 again. If not, the control program stores the processed results and the area of the corresponding standard throttle element 10 in the control program, and prompts to install the next standard throttle element 10.

[0073] The judgment criterion for determining whether to store the results in the control program is: judge the distribution law of the distribution curve of the results. If it is judged that the distribution law is the same as the distribution law of the standard turbine guide vane distribution curve, it is stored in the control program.

[0074] Step 10, install the next standard throttle element 10 at the exhaust end of the sealed container 7.

[0075] Step 11, repeat the above steps 3 to 9, and determine whether to store the results in the control program. If not, start from step 3 again. If so, the control program stores the processed results and the area of the corresponding standard throttle element 10 in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

[0076] As a specific implementation manner, based on the above measurement system, there is also a method for measuring the exhaust area of a turbine guide vane. Using the above measurement system, as Figure 2 shown, it specifically includes the following steps:

[0077] Step 1, install the turbine guide vane to be measured at the exhaust end of the sealed container 7;

[0078] Step 2, set the pressure difference between the inside and the outside of the sealed container 7 to be controlled in the control program of the host computer 1, and keep the set pressure difference in the control program consistent with the pressure difference control value given during calibration;

[0079] Step 3, the controller 3 controls the variable frequency motor 4 to start according to the command input by the control program of the host computer 1, drives the fan 5 to operate, supplies air to the sealed container 7, and establishes a pressure difference between the inside and the outside of the sealed container 7;

[0080] Step 4: The data acquisition device 2 collects the rotational speed of the fan 5, the pressure difference between the inside and the outside atmospheric environment of the sealed container 7, and the gas temperature inside the container, and sends them to the control program of the host computer 1.

[0081] Step 5: The host computer 1 compares the magnitude of the collected pressure difference with the given pressure difference of the control program, and by controlling the rotational speed of the motor and the fan 5, makes the difference between the pressure difference between the inside and the outside atmospheric environment of the sealed container 7 and the pressure difference control value less than the set threshold.

[0082] Step 6: When the pressure difference is consistent with the given pressure difference control value of the control program (allowing a deviation of no more than ±1%) and is stable for 10 seconds, the control program of the host computer 1 starts to record the collected rotational speed, pressure difference, and temperature results. When the deviation of the pressure difference from the given pressure difference control value of the control program exceeds ±1%, the control program stops recording. When the pressure difference is consistent with the given pressure difference of the control program again and is stable for 10 seconds, the control program starts to continue recording the collected data.

[0083] Step 7: The control program records the collected data at a frequency of 10 times per second. After 200 groups of each collected data are recorded, the acquisition is stopped, and the motor is controlled to stop running.

[0084] Step 8: The control program of the host computer 1 processes the 200 groups of collected data and the calibrated data, calculates the area of the guide vane, and saves and outputs the processed results together with the corresponding 200 groups of collected data and calibration results.

[0085] In summary, the present application has the following advantages:

[0086] 1. The measurement steps and parameters are few, the measurement process is simple, greatly reducing the measurement workload. It only takes about 1 hour from the start to the completion of the measurement, and the measurement efficiency is high.

[0087] 2. Only a gas source slightly higher than the atmospheric pressure (the pressure difference only needs to be about several hundred pascals) needs to be provided by the fan, without a high-pressure gas source. The measurement period is short, greatly reducing the energy consumption and significantly reducing the measurement cost.

[0088] 3. The parameters affecting the measurement results are few, and the stability and accuracy of the measurement results are easy to ensure.

[0089] 4. It has a wide range of applications and can measure the exhaust area of turbine guide vanes of various models and various area levels.

[0090] Finally, it should be noted that: in the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0091] Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A turbine guide vane exhaust area measurement system, characterized in that: It includes a measurement and control system, a device main body, and a test section; 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 main body includes a variable-frequency motor (4), a fan (5), and an airtight 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 airtight container (7) is used to blow air at a low speed to the test section; one end of the airtight container (7) is an air inlet end and is connected to the fan (5); the other end is an air outlet end for installing the test section, and the test section includes a turbine guide vane under test or a standard throttle element (10); a rotational speed sensor (6) connected to the data acquisition device (2) is provided on the fan (5), and a temperature sensor and a pressure sensor (9) connected to the data acquisition device (2) are provided inside the airtight container (7); a rectifying grid (8) is provided inside the airtight container (7); The corresponding calibration method includes: Step 1, estimate the exhaust area of the turbine guide vane under test, select two sets of standard throttle elements (10) with known areas, and make the exhaust area of the turbine guide vane under test fall between the areas of the two selected sets of standard throttle elements (10); Step 2, select one set of standard throttle elements (10) and install them at the air outlet end of the airtight container (7); Step 3, give the area value of the installed standard throttle element (10) in the control program of the host computer (1), and set the differential pressure control value between the pressure inside the container and the external atmospheric environment; Step 4, according to the command of the control program of the host computer (1), the controller (3) controls the variable-frequency motor (4) to start, drives the fan (5) to operate, supplies air into the airtight container (7), and establishes a differential pressure between the inside of the airtight container (7) and the external atmospheric environment; Step 5, the data acquisition device (2) collects the rotational speed of the fan (5), the differential pressure between the inside and the outside of the airtight container (7), and the gas temperature inside the container in real time, and sends them to the control program of the host computer (1); Step 6, the host computer (1) compares the collected differential pressure with the differential pressure control value, and controls the rotational speeds of the variable-frequency motor (4) and the fan (5) to make the difference between the differential pressure between the inside of the airtight container (7) and the external atmospheric environment and the differential pressure control value less than the set threshold; Step 7, when the difference between the differential pressure between the inside of the airtight container (7) and the external atmospheric environment and the differential pressure control value set by the control program is less than the set threshold and remains stable for a set time, the control program of the host computer (1) starts to record the collected rotational speed, differential pressure, and temperature results; Step 8, set the frequency of the control program for recording the collected data as the number of groups of data collected per unit time. When the recorded collected data reaches the set number of groups, stop the collection, and control the variable-frequency motor (4) to stop operating; Step 9, the control program of the host computer (1) processes the collected data of the set number of groups, gives the distribution curve of the results, and judges whether to store the results in the control program. If not, it starts from Step 3 again. If so, the control program stores the processed results and the area of the corresponding standard throttle element (10) in the control program, and prompts to install the next standard throttle element (10). Step 10, install the next standard throttle element (10) at the exhaust end of the sealed container (7). Step 11, repeat the above Steps 3 to 9, and judge whether to store the results in the control program. If not, start from Step 3 again. If so, the control program stores the processed results and the area of the corresponding standard throttle element (10) in the control program, and prompts that the system calibration is completed. After confirmation, the control program enters the area measurement stage.

2. The turbine guide vane exhaust area measurement system according to claim 1, wherein: The air supply flow rate of the selected fan (5) has a linear relationship with the rotational speed.

3. The turbine guide vane exhaust area measurement system according to claim 1, wherein: A control program is provided in the host computer (1), and set values are stored in the control program. The set value is the container pressure difference set for calibration. When the pressure difference between the inside and the outside atmospheric environment of the sealed container (7) reaches and stabilizes at the set value of the control program, the collected pressure difference and the rotational speed of the fan (5) are recorded and stored.

4. The turbine guide vane exhaust area measurement system according to claim 1, wherein: The set time is 10 s, the set number of groups is 200 groups, and the set threshold is ±1%.

5. The turbine guide vane exhaust area measurement system according to claim 4, wherein: When the deviation between the pressure difference between the inside and the outside atmospheric environment of the sealed container (7) and the pressure difference control value exceeds the set threshold, the control program stops recording, adjusts the rotational speed until the pressure difference between the inside and the outside atmospheric environment of the sealed container (7) and the pressure difference control value is less than the set threshold and lasts for the set time, and then the control program resumes recording and collecting data.

6. A method for measuring the exhaust area of a turbine guide vane, using the measuring system as described in any one of claims 1-3, characterized in that Including: Step 1, install the measured turbine guide vane at the exhaust end of the sealed container (7). Step 2, give the pressure difference between the inside and the outside atmospheric environment of the sealed container (7) that needs to be controlled in the control program of the host computer (1), and keep the given pressure difference in the control program consistent with the pressure difference control value given during calibration. Step 3, the controller (3) controls the start of the frequency conversion motor (4) according to the command input by the control program of the host computer (1), drives the fan (5) to operate, supplies air into the sealed container (7), and establishes a pressure difference between the inside and the outside atmospheric environment of the sealed container (7). Step 4, the data acquisition device (2) collects the rotational speed of the fan (5), the pressure difference between the inside and the outside atmospheric environment of the sealed container (7), and the gas temperature inside 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 rotational speed of the motor and the fan (5) to make the difference between the pressure difference between the inside and the outside atmospheric environment of the sealed container (7) and the pressure difference control value less than the set threshold. 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 results of rotational speed, pressure difference, and temperature; 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. When the set number of groups of each collected data is reached, the collection is stopped, and the motor is controlled to stop running; Step 8, the control program of the host computer (1) processes the collected set number of groups of data and the calibrated data, calculates the area of the guide vane, and saves and outputs the processed results together with the corresponding collected set number of groups of data and the calibration results.

7. The method for measuring the exhaust area of a turbine guide vane according to claim 6, characterized in that: The set time is 10 s, the set number of groups is 200 groups, and the set threshold is ±1%.

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