Vortex flow test device and test method

Abstract

The present invention discloses a vortex finder flow test device and test method, belonging to the technical field of aviation gas turbine engines. The vortex finder flow test device includes a pressure stabilizing cylinder and a vortex finder test piece. The pressure stabilizing cylinder input end is used to input high-pressure air. The vortex finder test piece is arranged at the output end of the pressure stabilizing cylinder. The vortex finder test piece includes a primary vortex finder fixture and a secondary vortex finder fixture for fixing a secondary vortex finder. The primary vortex finder fixture is provided with a simulated flow channel corresponding to the primary vortex finder at the center position. A primary vortex finder plug is provided on the end face of the primary vortex finder for sealing the primary vortex finder. A secondary vortex finder plug is provided on the end face of the secondary vortex finder for sealing the secondary vortex finder. The secondary vortex finder has a venturi structure. The profile of the simulated flow channel is the same as the venturi structure of the secondary vortex finder. The throat diameter of the simulated flow channel is equal to the throat diameter of the venturi structure of the secondary vortex finder. The present invention has the advantage of improving the accuracy of vortex finder flow test.

Description

Technical Field

[0001] The invention relates to the technical field of aviation gas turbine engines, in particular to a vortex finder flow rate test device and a test method. Background Art

[0002] In the combustion chamber of an aviation gas turbine engine, swirlers of different structures are generally designed to organize combustion. The structural parameters of the swirler have a significant impact on the swirler flow rate, outlet flow field, and oil mist field, thereby affecting the combustion performance of the combustion chamber. Therefore, the quality of the swirler design is directly related to the combustion performance of the combustion chamber and is one of the most important components in the combustion chamber. There are various types of swirler structures. Among them, the two-stage swirler is widely used in the combustion chamber of modern aviation gas turbine engines as a swirl combustion organization device. Compared with the single-stage swirler, the two-stage swirler has a more complex structure and flow field characteristics. Its outlet swirl flow field is not only related to the structural parameters of the first and second stage swirlers themselves, but also affected by the aerodynamic matching of the first and second stage swirlers. Therefore, in the development of the combustion chamber, the air flow of the two-stage swirler needs to be accurately measured and an evaluation standard needs to be provided to ensure the performance of the combustion chamber.

[0003] Currently, vortex finder flow testing is the primary means of evaluating whether a vortex finder meets design requirements. Its flow data is also the basis for pairing vortex finder combinations. Therefore, how to conduct flow tests on vortex finders and match two-stage vortex finder combinations are major issues that need to be addressed in combustion chamber design. During vortex finder testing, it is necessary to design a test fixture to test the vortex finder flow. However, existing test fixtures fail to simulate the actual working flow path of the vortex finder, resulting in test flow rates that cannot reflect actual working conditions. This leads to poor operating sealing performance during use, resulting in large deviations in flow test results. The flow test results are also affected by environmental parameters, making them difficult to accurately correct and resulting in low accuracy. Summary of the Invention

[0004] The present invention provides a vortex finder flow rate test device and a test method to solve the technical problem of low precision of existing vortex finder flow rate testing.

[0005] According to one aspect of the present invention, a vortex finder flow test device is provided, comprising a pressure stabilizing cylinder and a vortex finder test piece, the pressure stabilizing cylinder input end being used to input high-pressure air, the vortex finder test piece being arranged at the output end of the pressure stabilizing cylinder, the vortex finder test piece comprising a primary vortex finder fixture and a secondary vortex finder fixture for fixing a secondary vortex finder; a primary vortex finder mounting groove for mounting a primary vortex finder is provided on the primary vortex finder fixture, a simulated flow channel corresponding to the primary vortex finder is provided at the center position of the primary vortex finder fixture, a primary vortex finder plug for sealing the primary vortex finder is provided on the end face of the primary vortex finder; a secondary vortex finder mounting groove for mounting a secondary vortex finder is provided on the secondary vortex finder fixture, a secondary vortex finder plug for sealing the secondary vortex finder is provided on the end face of the secondary vortex finder; the secondary vortex finder has a venturi structure, the profile of the simulated flow channel is the same as the venturi structure of the secondary vortex finder, and the throat diameter of the simulated flow channel is equal to the throat diameter of the venturi structure of the secondary vortex finder.

[0006] Optionally, the depth of the first-stage vortex finder mounting groove is equal to the thickness of the mounting surface of the first-stage vortex finder, and the depth of the second-stage vortex finder mounting groove is less than the thickness of the end surface of the second-stage vortex finder.

[0007] Optionally, a first-level sealing ring mounting groove is provided on the plane of the first-level vortex finder mounting groove, and a first-level O-ring is provided in the first-level sealing ring mounting groove for sealing the first-level vortex finder mounting end face; a second-level sealing ring mounting groove is provided on the plane of the second-level vortex finder mounting groove, and a second-level O-ring is provided in the second-level sealing ring mounting groove for sealing the second-level vortex finder mounting end face.

[0008] Optionally, the first-stage vortex finder fixture is provided with a first-stage clamping piece connected to the first-stage vortex finder plug, and the second-stage vortex finder fixture is provided with a second-stage clamping piece connected to the second-stage vortex finder plug, and both the first-stage clamping piece and the second-stage clamping piece are lever structures.

[0009] Optionally, the vortex flow test device further includes a regulating valve and a flow meter connected to the input end of the pressure stabilizing cylinder, and the high-pressure gas enters the pressure stabilizing cylinder after passing through the regulating valve and the flow meter in sequence.

[0010] Optionally, a temperature test probe and a pressure test probe are provided on the inner wall of the pressure stabilizing cylinder, and the temperature test probe and the pressure test probe are distributed at the center position of the pressure stabilizing cylinder in the axial direction.

[0011] According to another aspect of the present invention, a vortex finder flow rate test device and test method are provided, which include the following steps:

[0012] Step S1: using a first-stage vortex finder fixture to test the air flow of the first-stage vortex finder, and correcting the test results;

[0013] Step S2: using a secondary vortex finder fixture to test the air flow of the secondary vortex finder and correcting the test results;

[0014] Step S3: Arrange the first-stage vortex finders and the second-stage vortex finders from small to large according to the corrected flow value, and form a two-stage vortex finder combination according to the matching method of "small with small" and "large with large";

[0015] Step S4: using a two-stage vortex finder fixture to test the combined air flow of the two-stage vortex finder.

[0016] Optionally, the method for correcting the test results in step 1 and step 2 includes:

[0017] Step Y1: Test the air flow rate M1 of the standard component, query the standard air flow rate Mb recorded by the standard component, and calculate the correction coefficient ε=Mb / M1;

[0018] Step Y2: testing the air flow Mi of the first-stage vortex finder or the second-stage vortex finder;

[0019] Step Y3: Correct the air flow rate tested in step Y2, and the corrected flow rate Mj = ε × Mi.

[0020] Optionally, the use of a first-level vortex finder fixture to test the first-level vortex finder air flow includes: installing the first-level vortex finder on the first-level vortex finder fixture, sealing it with a first-level vortex finder plug, and installing the first-level vortex finder fixture on the output end of the pressure stabilizing cylinder; adjusting the regulating valve so that the pressure in the pressure stabilizing cylinder is within the test requirements; after the pressure of the pressure stabilizing cylinder is stabilized, collecting the air mass flow in the flowmeter, and recording the temperature, pressure values ​​in the pressure stabilizing cylinder and the ambient temperature and pressure values.

[0021] Optionally, the use of a first-level vortex finder fixture to test the air flow of a first-level vortex finder includes: installing the second-level vortex finder on the second-level vortex finder fixture, sealing it with a second-level vortex finder plug, and installing the second-level vortex finder fixture on the output end of the pressure stabilizing cylinder; adjusting the regulating valve so that the pressure in the pressure stabilizing cylinder is within the test requirements; after the pressure of the pressure stabilizing cylinder stabilizes, collecting the air mass flow in the flowmeter, and recording the temperature, pressure values ​​in the pressure stabilizing cylinder and the ambient temperature and pressure values.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The flow channel structure of the first-stage vortex finder flow test fixture is the same as that of the second-stage vortex finder venturi, so that the first-stage vortex finder flow rate is closer to the flow rate in the combined state, thereby improving the test accuracy;

[0024] 2. By adopting the modified flow test method and using the standard flow to correct the test flow, the influence of different test equipment and different test conditions on the flow test results can be solved, the accuracy of the test results can be improved, and the influence of temperature, pressure and system errors can be avoided. The correction results are more valuable for engineering applications;

[0025] 3. The first and second stage matching adopts the method of "small with small" and "large with large" to ensure the consistency of the flow ratio of the first and second stage vortex finders and improve the combustion performance;

[0026] 4. By setting up sealing grooves and sealing rings, the sealing effect is enhanced and the test accuracy is improved.

[0027] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 This is a diagram of the vortex flow test system for this application;

[0030] Figure 2 This is the structural diagram of the first-stage eddy current fixture for this application;

[0031] Figure 3 The structural diagram of the secondary eddy current detector test fixture for this application;

[0032] Figure 4 This is a diagram of the vortex finder flow test method for this application;

[0033] Figure 5 This is a diagram of the vortex finder flow correction method for this application.

[0034] Legend:

[0035] 1. Control valve; 2. Flow meter; 3. Pressure stabilizing cylinder; 4. Test piece; 5. Pressure test probe; 6. Inlet pipe; 7. Exhaust pipe; 401. First-stage vortex finder; 402. First-stage vortex finder fixture; 403. O-ring; 404. Sealing ring mounting groove; 405. Simulated flow channel; 406. First-stage vortex finder mounting groove; 407. First-stage vortex finder plug; 408. First-stage pressing piece; 411. Second-stage vortex finder; 412. Second-stage vortex finder fixture; 413. Second-stage vortex finder mounting hole; 414. Second-stage vortex finder mounting groove; 417. Venturi tube; 418. Second-stage vortex finder plug; 419. Second-stage pressing piece. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiments of the present application disclose a vortex flow test device and a test method.

[0039] Reference Figure 1 The vortex flow test device includes a regulating valve 1 and a flowmeter 2 connected to the input end of the pressure-stabilizing cylinder 3. High-pressure gas enters the pressure-stabilizing cylinder 3 after passing through the regulating valve 1 and flowmeter 2 in sequence. The regulating valve 1 includes an inlet pipe 6 and an exhaust pipe 7. The regulating valve 1 is used to accurately control the gas flow and pressure, ensuring that the pressure of the gas entering the pressure-stabilizing cylinder 3 is within the set range. The flowmeter 2 is used to monitor and record the gas flow entering the pressure-stabilizing cylinder 3 in real time, ensuring stable airflow and accurate data during the test, thereby providing a reliable control and monitoring method for the vortex flow measurement.

[0040] Reference Figure 2 and Figure 3 The vortex finder flow test device includes a pressure stabilizing cylinder 3 and a vortex finder test piece 4. The input end of the pressure stabilizing cylinder 3 is used to input high-pressure air. The vortex finder test piece 4 is arranged at the output end of the pressure stabilizing cylinder 3. The vortex finder test piece 4 includes a first-level vortex finder 401 fixture and a second-level vortex finder 411 fixture for fixing the second-level vortex finder 411; a first-level vortex finder 401 mounting groove for mounting the first-level vortex finder 401 is provided on the first-level vortex finder 401 fixture, a simulated flow channel 405 corresponding to the first-level vortex finder 401 is provided at the center position of the first-level vortex finder 401 fixture, and a first-level vortex finder 401 plug for sealing the first-level vortex finder 401 is provided on the end face of the first-level vortex finder 401; a second-level vortex finder 411 mounting groove for mounting the second-level vortex finder 411 is provided on the second-level vortex finder 411 fixture, and a second-level vortex finder 411 mounting groove for mounting the second-level vortex finder 411 is provided on the second-level vortex finder 411. 1. A plug for the secondary vortex finder 411 is provided on the end face for sealing the secondary vortex finder 411. By inputting stable high-pressure air into the pressure-stabilizing cylinder 3, the air source is ensured to be stable, providing reliable conditions for the vortex finder flow test. The clamps for the primary and secondary vortex finders 411 are respectively used to fix and test the vortex finders. The mounting groove and the simulated flow channel 405 of the clamp for the primary vortex finder 401 are designed to accurately simulate the actual working state of the vortex finder, making the test flow closer to the actual usage. At the same time, the plug provided on the end face of the primary vortex finder 401 effectively prevents the leakage of the airflow during the test, ensuring that all the airflow passes through the vortex finder, thereby improving the accuracy and consistency of the test data. Through these designs, the flow rates of the primary and secondary vortex finders 411 can be measured separately and accurately, and their combined performance can be evaluated.

[0041] The secondary vortex finder 411 has a venturi tube 417 structure. The profile of the simulated flow channel 405 is identical to the venturi tube 417 structure of the secondary vortex finder 411, and the throat diameter of the simulated flow channel 405 is equal to the throat diameter of the venturi tube 417 structure of the secondary vortex finder 411. The fixture for the secondary vortex finder 411 also has a mounting hole for the secondary vortex finder 411, into which the venturi tube 417 structure extends. By designing a profile and throat diameter identical to the venturi tube 417 structure of the secondary vortex finder 411 in the simulated flow channel 405, the simulated flow channel 405 can accurately replicate the fluid flow characteristics of the secondary vortex finder 411 under actual operating conditions, thereby ensuring that the air flow rate and flow field distribution during testing are consistent with actual use. This design effectively improves the accuracy and representativeness of the test results, providing more reliable experimental data support for evaluating the performance of the secondary vortex finder 411.

[0042] The depth of the mounting groove for the first-stage vortex finder 401 is equal to the thickness of the mounting surface of the first-stage vortex finder 401, while the depth of the mounting groove for the second-stage vortex finder 411 is less than the thickness of the end face of the second-stage vortex finder 411. By designing the depth of the mounting groove for the first-stage vortex finder 401 to be equal to the thickness of the mounting surface of the first-stage vortex finder 401, the first-stage vortex finder 401 is ensured to be fully embedded in the mounting groove, achieving a secure installation and a good seal. Furthermore, by designing the depth of the mounting groove for the second-stage vortex finder 411 to be less than the thickness of the end face of the second-stage vortex finder 411, the second-stage vortex finder 411 is partially exposed during installation, increasing the pressing force and stability of the installation, thereby effectively preventing airflow leakage and improving the accuracy and reliability of the test.

[0043] A primary sealing ring mounting groove 404 is provided on the plane of the mounting groove of the primary vortex finder 401. A primary O-ring 403 is provided in the primary sealing ring mounting groove 404 for sealing the mounting end face of the primary vortex finder 401. A secondary sealing ring mounting groove 404 is provided on the plane of the mounting groove of the secondary vortex finder 411. A secondary O-ring 403 is provided in the secondary sealing ring mounting groove 404 for sealing the mounting end face of the secondary vortex finder 411. By providing corresponding sealing ring mounting grooves 404 on the planes of the mounting grooves of the primary and secondary vortex finders 411, and installing O-rings 403 therein, effective sealing of the end faces of the primary and secondary vortex finders 411 is ensured during installation, preventing airflow leakage during testing, further improving the accuracy and reliability of the test, and at the same time ensuring the sealing performance of the vortex finders under actual working conditions, which helps to obtain more accurate flow data.

[0044] The first-stage vortex finder 401 fixture is provided with a first-stage clamping member 408 connected to the first-stage vortex finder 401 plug, and the second-stage vortex finder 411 fixture is provided with a second-stage clamping member 419 connected to the second-stage vortex finder 411 plug. Both the first-stage clamping member 408 and the second-stage clamping member 419 are lever structures. This makes it easier to apply and adjust the clamping force during the test, ensuring that the vortex finder plug is tightly closed to prevent airflow leakage, thereby improving the sealing and accuracy of the test, while also simplifying the operation and increasing the ease of use and reliability of the device. The clamping member of the lever structure generally includes main components such as a lever arm, a fulcrum (pivot point), a clamping block or pressure plate, a fixed base, and an operating handle, wherein the lever arm is connected to the fixed base via a fulcrum, and the operator applies force through the operating handle to rotate the lever arm around the fulcrum, and applies a larger clamping force to the vortex finder plug through the clamping block or pressure plate.

[0045] The inner wall of the pressure stabilizing cylinder 3 is provided with a temperature test probe and a pressure test probe 5, which are distributed at the center position of the pressure stabilizing cylinder 3 in the axial direction. This allows the temperature and pressure of the gas in the pressure stabilizing cylinder 3 to be accurately measured in real time during the test. This arrangement ensures the representativeness and accuracy of the measurement data and can fully reflect the gas state in the pressure stabilizing cylinder 3, thereby providing the necessary environmental parameters for the vortex flow test and ensuring the reliability and consistency of the test results. In a specific embodiment, the temperature test probes and pressure test probes 5 are evenly arranged at 4 to 6 locations along the inner circumferential wall of the pressure stabilizing cylinder 3.

[0046] Reference Figure 4 According to another aspect of the present invention, a vortex flow test device and a test method are provided, which include the following steps:

[0047] Step S1: using a fixture for the first-stage vortex finder 401 to test the air flow of the first-stage vortex finder 401, and correcting the test results.

[0048] Using the first-stage vortex finder 401 fixture to test the air flow of the first-stage vortex finder 401 includes: installing the first-stage vortex finder 401 on the first-stage vortex finder 401 fixture, and sealing it with the first-stage vortex finder 401 plug, and installing the first-stage vortex finder 401 fixture at the output end of the pressure-stabilizing cylinder 3; adjusting the regulating valve 1 so that the pressure in the pressure-stabilizing cylinder 3 is within the test requirements; after the pressure of the pressure-stabilizing cylinder 3 is stabilized, collecting the air mass flow in the flowmeter 2, and recording the temperature, pressure values ​​in the pressure-stabilizing cylinder 3 and the ambient temperature and pressure values.

[0049] Step S1 installs the first-stage vortex finder 401 in a specially designed first-stage vortex finder 401 fixture and ensures that it is firmly fixed and well sealed. Then, the regulating valve 1 is used to control the air pressure entering the pressure stabilizing cylinder 3. After the air pressure stabilizes, the air flow through the vortex finder is measured by the flow meter 2. At the same time, the environmental parameters such as the temperature and pressure in the pressure stabilizing cylinder 3 are recorded. Then, the test results are corrected according to the pre-measured standard parts flow data to eliminate the errors caused by equipment and environmental factors.

[0050] Step S2: using the secondary vortex finder 411 fixture to test the air flow of the secondary vortex finder 411 and correcting the test results.

[0051] Using the secondary vortex finder 411 fixture to test the air flow of the secondary vortex finder 411 includes: installing the secondary vortex finder 411 on the secondary vortex finder 411 fixture, and sealing it with the secondary vortex finder 411 plug, and installing the secondary vortex finder 411 fixture to the output end of the pressure stabilizing cylinder 3; adjusting the regulating valve 1 to make the pressure in the pressure stabilizing cylinder 3 within the test requirements; after the pressure of the pressure stabilizing cylinder 3 is stabilized, collecting the air mass flow in the flowmeter 2, and recording the temperature, pressure values ​​in the pressure stabilizing cylinder 3 and the ambient temperature and pressure values.

[0052] Step S2 is to install the secondary vortex finder 411 in a specially designed secondary vortex finder 411 fixture, ensure that it is firmly fixed and well sealed, and then adjust the air pressure entering the pressure stabilizing cylinder 3 to keep it within the test requirements. After the air pressure stabilizes, use the flow meter 2 to measure the air flow through the secondary vortex finder 411, and record the temperature, pressure and other environmental parameters in the pressure stabilizing cylinder 3. Then, use the known flow data of the standard parts to make corrections, eliminate the influence of equipment differences and environmental conditions on the test results, and obtain more accurate secondary vortex finder 411 flow data.

[0053] Step S3: Arrange the first-stage vortex finder 401 and the second-stage vortex finder 411 from small to large according to the corrected flow value, and form a two-stage vortex finder combination according to the matching method of "small with small" and "large with large".

[0054] A matching method of "small with small" and "large with large" is adopted, that is, the first-stage vortex finder 401 with a smaller flow rate is combined with the second-stage vortex finder 411 with a smaller flow rate, and the first-stage vortex finder 401 with a larger flow rate is combined with the second-stage vortex finder 411 with a larger flow rate to form a two-stage vortex finder combination. This process ensures that the first-stage and second-stage vortex finders 411 have relatively matched flow characteristics when combined, ensuring that their airflow distribution and combustion efficiency in actual applications achieve the best results, thereby improving the overall performance of the combustion chamber.

[0055] Step S4: using the two-stage vortex finder 411 fixture to test the combined air flow of the two-stage vortex finder.

[0056] Reference Figure 5 , the method for correcting the test results in step 1 and step 2 includes:

[0057] Step Y1: Test the air flow rate M1 of the standard part, query the standard air flow rate Mb recorded by the standard part, and calculate the correction coefficient ε = Mb / M1; In this step, first measure the actual air flow rate M1 of the standard part. The standard part is a reference device whose air flow rate is known, and its flow rate Mb under standard conditions is known and reliable. By measuring M1 and comparing it with the standard flow rate Mb, the correction coefficient ε = Mb / M1 is calculated. The correction coefficient ε represents the deviation of the actual test conditions (such as equipment accuracy, ambient temperature and pressure) from the standard conditions. The purpose of this step is to establish a calibration benchmark to ensure that all subsequent tests can be adjusted back to the precise values ​​under standard conditions.

[0058] Step Y2: Test the air flow Mi of the first-stage vortex finder 401 or the second-stage vortex finder 411; In this step, the air flow is measured for the vortex finder that actually needs to be tested (whether it is the first-stage vortex finder 401 or the second-stage vortex finder 411) to obtain a preliminary flow value Mi. This measurement is performed under the same experimental conditions, which are consistent with the measurement conditions of the standard parts, to ensure that the correction coefficient can be applied to subsequent correction steps. Although the measured Mi directly reflects the vortex finder flow in the current experimental environment, it may deviate from the true value due to equipment accuracy or environmental changes, and therefore requires further correction.

[0059] Step Y3: Correct the air flow measured in Step Y2 to obtain the corrected flow rate Mj = ε × Mi. The vortex finder flow rate Mi measured in the previous step is multiplied by the correction factor ε to calculate the corrected flow rate Mj: Mj = ε × Mi. This correction adjusts Mi to the flow rate value Mj consistent with standard conditions. This correction process eliminates the effects of equipment errors and environmental variables, ensuring that the final flow rate value Mj more accurately represents the actual performance of the vortex finder under ideal conditions.

[0060] By calculating the correction coefficient and applying it to the actual measurement results, this method effectively corrects errors caused by test environment, equipment differences, etc., thereby improving the accuracy of flow measurement; the corrected flow data Mj can reflect the performance of the vortex flowmeter under standard test conditions, making the flow data measured by different equipment and different environments comparable, which is conducive to unifying evaluation standards in the design, production and quality control processes; this correction method ensures that the test results are not significantly affected by changes in the environment and equipment, and provides more reliable data support, especially when multiple measurements or cross-device tests are carried out, to maintain consistency.

[0061] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Vortex flow test device, characterized by: The invention comprises a pressure stabilizing cylinder (3) and a vortex finder test piece (4), wherein the input end of the pressure stabilizing cylinder (3) is used to input high-pressure air, the vortex finder test piece (4) is arranged at the output end of the pressure stabilizing cylinder (3), and the vortex finder test piece (4) comprises a primary vortex finder (401) fixture and a secondary vortex finder (411) fixture for fixing the secondary vortex finder (411); The first-stage vortex finder (401) fixture is provided with a first-stage vortex finder (401) installation groove for installing the first-stage vortex finder (401), a simulation flow channel (405) corresponding to the first-stage vortex finder (401) is provided at the center of the first-stage vortex finder (401), and a first-stage vortex finder (401) plug for sealing the first-stage vortex finder (401) is provided on the end surface of the first-stage vortex finder (401); The secondary vortex finder (411) fixture is provided with a secondary vortex finder (411) installation groove for installing the secondary vortex finder (411), and a secondary vortex finder (411) plug for sealing the secondary vortex finder (411) is provided on the end surface of the secondary vortex finder (411); The secondary vortex finder (411) has a venturi (417) structure, the profile of the simulated flow channel (405) is the same as the venturi (417) structure of the secondary vortex finder (411), and the throat diameter of the simulated flow channel (405) is equal to the throat diameter of the venturi (417) structure of the secondary vortex finder (411).

2. The vortex flow test device according to claim 1, characterized in that: The depth of the installation groove of the first-stage vortex finder (401) is equal to the thickness of the installation surface of the first-stage vortex finder (401), and the depth of the installation groove of the second-stage vortex finder (411) is less than the thickness of the end surface of the second-stage vortex finder (411).

3. The vortex flow test device according to claim 2, characterized in that: A first-level sealing ring installation groove (404) is provided on the plane of the first-level vortex finder (401) installation groove, and a first-level O-type sealing ring (403) is provided in the first-level sealing ring installation groove (404) for sealing the installation end face of the first-level vortex finder (401); a second-level sealing ring installation groove (404) is provided on the plane of the second-level vortex finder (411) installation groove, and a second-level O-type sealing ring (403) is provided in the second-level sealing ring installation groove (404) for sealing the installation end face of the second-level vortex finder (411).

4. The vortex flow test device according to claim 3, characterized in that: The first-stage vortex finder (401) clamp is provided with a first-stage pressing piece (408) connected to the first-stage vortex finder (401) plug, and the second-stage vortex finder (411) clamp is provided with a second-stage pressing piece (419) connected to the second-stage vortex finder (411) plug. Both the first-stage pressing piece (408) and the second-stage pressing piece (419) are lever structures.

5. The vortex flow test device according to claim 1, characterized in that: The vortex flow test device further comprises a regulating valve (1) and a flow meter (2) connected to the input end of the pressure stabilizing cylinder (3); high-pressure gas passes through the regulating valve (1) and the flow meter (2) in sequence and then enters the pressure stabilizing cylinder (3).

6. The vortex flow test device according to claim 1, characterized in that: The inner wall of the pressure stabilizing cylinder (3) is provided with a temperature test probe and a pressure test probe (5), and the temperature test probe and the pressure test probe (5) are distributed at the central position of the pressure stabilizing cylinder (3) in the axial direction.

7. A vortex finder flow rate test method, using the vortex finder flow rate test device according to claims 1-6, characterized in that: The steps include: Step S1: using a first-stage vortex finder (401) fixture to test the air flow of multiple first-stage vortex finders (401), and correcting the test results; Step S2: using a secondary vortex finder (411) fixture to test the air flow of multiple secondary vortex finders (411), and correcting the test results; Step S3: Arranging the first-stage vortex finder (401) and the second-stage vortex finder (411) from small to large based on the corrected flow value, and forming a two-stage vortex finder combination according to the matching method of "small with small" and "large with large", that is, combining the first-stage vortex finder (401) with a small flow rate with the second-stage vortex finder (411) with a small flow rate, and combining the first-stage vortex finder (401) with a large flow rate with the second-stage vortex finder (411) with a large flow rate, to form a two-stage vortex finder combination; Step S4: using a two-stage vortex finder (411) fixture to test the combined air flow of the two-stage vortex finder.

8. The vortex finder flow rate test method according to claim 7, characterized in that: Methods for correcting the test results in steps 1 and 2 include: Step Y1: Test the air flow rate M1 of the standard part, query the standard air flow rate Mb recorded by the standard part, and calculate the correction coefficient ε=Mb / M1; Step Y2: testing the air flow Mi of the first-stage vortex finder (401) or the second-stage vortex finder (411); Step Y3: Correct the air flow rate tested in step Y2, and the corrected flow rate Mj=ε×Mi.

9. The vortex finder flow rate test method according to claim 8, characterized in that: The method of using a first-stage vortex finder (401) fixture to test the air flow of the first-stage vortex finder (401) comprises: The first-stage vortex finder (401) is mounted on a first-stage vortex finder (401) fixture, and is sealed using a first-stage vortex finder (401) plug, and the first-stage vortex finder (401) fixture is mounted on the output end of the pressure stabilizing cylinder (3); Adjust the regulating valve (1) so that the pressure in the pressure stabilizing cylinder (3) is within the test requirement range; After the pressure of the pressure stabilizing cylinder (3) is stabilized, the air mass flow in the flow meter (2) is collected, and the temperature and pressure values ​​in the pressure stabilizing cylinder (3) and the ambient temperature and pressure values ​​are recorded.

10. The vortex finder flow rate test method according to claim 9, characterized in that: The method of using the secondary vortex finder (411) fixture to test the air flow of the secondary vortex finder (411) comprises: The secondary vortex finder (411) is mounted on a secondary vortex finder (411) fixture, and is sealed with a secondary vortex finder (411) plug, and the secondary vortex finder (411) fixture is mounted on the output end of the pressure stabilizing cylinder (3); Adjust the regulating valve (1) so that the pressure in the pressure stabilizing cylinder (3) is within the test requirement range; After the pressure of the pressure stabilizing cylinder (3) is stabilized, the air mass flow in the flow meter (2) is collected, and the temperature and pressure values ​​in the pressure stabilizing cylinder (3) and the ambient temperature and pressure values ​​are recorded.

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