Swirler flow test device and test method

Abstract

The invention discloses a swirler flow test device and method, and belongs to the technical field of aviation gas turbine engines, the swirler flow test device comprises a pressure stabilizing cylinder and a swirler test piece, the input end of the pressure stabilizing cylinder is used for inputting high-pressure air, and the swirler test piece is arranged at the output end of the pressure stabilizing cylinder; the swirler test piece comprises a first-stage swirler clamp and a second-stage swirler clamp for fixing a second-stage swirler; a simulation flow channel corresponding to the first-stage swirler is arranged at the center position of the first-stage swirler clamp, a first-stage swirler plug used for plugging the first-stage swirler is arranged on the end face of the first-stage swirler, and a second-stage swirler plug used for plugging the second-stage swirler is arranged on the end face of the second-stage swirler; the second-stage swirler is provided with a venturi structure, the molded surface of the simulation runner is the same as the venturi structure of the second-stage swirler, and the throat diameter of the simulation runner is equal to the throat diameter of the venturi structure of the second-stage swirler. The method has the advantage that the swirler flow testing precision is improved.

Description

Technical Field

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

[0002] In the combustion chamber of an aviation gas turbine engine, swirlers with different structures are generally designed to organize combustion. The structural parameters of the swirler have a great influence on the swirler flow rate, outlet flow field and oil mist field, thus 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 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 turbines as a swirl combustion organization device. Compared with the single-stage swirler, the two-stage swirler has 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, it is necessary to accurately measure the air flow of the two-stage swirler and provide evaluation criteria to ensure the performance of the combustion chamber.

[0003] At present, the vortex finder flow test is the main means to evaluate whether the vortex finder meets the design requirements. Its flow data is also the basis for vortex finder combination pairing. Therefore, how to conduct flow tests on vortex finders and match the two-stage vortex finder combination is the main problem to be solved in the combustion chamber design. In the vortex finder test, it is necessary to test the vortex finder flow by designing a test fixture. The existing test fixture does not simulate the actual working flow channel of the vortex finder in design, so that the test flow cannot reflect the actual working state. The operating sealing performance is poor during use, resulting in large deviations in the flow test results. The flow test results are affected by environmental parameters and are difficult to accurately correct, resulting in low accuracy. Summary of the invention

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

[0005] According to one aspect of the present invention, there is provided a vortex finder flow test device, comprising a pressure stabilizing cylinder and a vortex finder test piece, wherein the input end of the pressure stabilizing cylinder is used to input high-pressure air, and the vortex finder test piece is arranged at the output end of the pressure stabilizing cylinder, and the vortex finder test piece comprises 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 arranged at the center position of the primary vortex finder fixture, and a primary vortex finder plug for blocking the primary vortex finder is arranged 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, and a secondary vortex finder plug for blocking the secondary vortex finder is arranged 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 installation groove is set on the plane of the first-level vortex finder installation groove, and a first-level O-ring is set in the first-level sealing ring installation groove, which is used for sealing the first-level vortex finder installation end face; a second-level sealing ring installation groove is set on the plane of the second-level vortex finder installation groove, and a second-level O-ring is set in the second-level sealing ring installation groove, which is used for sealing the second-level vortex finder installation 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 comprises 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 flow test device and a test method are provided, which include the following steps:

[0012] Step S1: using a primary vortex finder fixture to test the primary vortex finder air flow rate, and correcting the test result;

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

[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 part, query the standard air flow rate Mb recorded by the standard part, 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 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, and 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 to make the pressure in the pressure stabilizing cylinder within the test requirements; after the pressure in the pressure stabilizing cylinder is stabilized, collecting the air mass flow in the flowmeter, and recording the temperature, pressure value in the pressure stabilizing cylinder and the ambient temperature and pressure value.

[0021] Optionally, the use of a first-level vortex finder fixture to test the first-level vortex finder air flow includes: installing the second-level vortex finder on the second-level vortex finder fixture, and 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 to make the pressure in the pressure-stabilizing cylinder within the test requirements; after the pressure in the pressure-stabilizing cylinder is stabilized, collecting the air mass flow in the flowmeter, and recording the temperature, pressure value in the pressure-stabilizing cylinder and the ambient temperature and pressure value.

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

[0023] 1. The flow channel with the same structure as the venturi tube of the second-stage vortex finder is set in the first-stage vortex finder flow test fixture, so that the flow rate of the first-stage vortex finder 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 flowers and improve the combustion performance;

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

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

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

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

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

[0031] Figure 3 The structural diagram of the secondary vortex flow device test fixture for this application;

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

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

[0034] Legend:

[0035] 1. Regulating valve; 2. Flow meter; 3. Pressure stabilizing cylinder; 4. Test piece; 5. Pressure test probe; 6. Inlet pipe; 7. Exhaust pipe; 401. Primary vortex finder; 402. Primary vortex finder fixture; 403. O-ring; 404. Sealing ring mounting groove; 405. Simulated flow channel; 406. Primary vortex finder mounting groove; 407. Primary vortex finder plug; 408. Primary clamp; 411. Secondary vortex finder; 412. Secondary vortex finder fixture; 413. Secondary vortex finder mounting hole; 414. Secondary vortex finder mounting groove; 417. Venturi tube; 418. Secondary vortex finder plug; 419. Secondary clamp. 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 flow meter 2 connected to the input end of the pressure stabilizing cylinder 3. The high-pressure gas enters the pressure stabilizing cylinder 3 after passing through the regulating valve 1 and the flow meter 2 in sequence. The regulating valve 1 includes an air inlet pipe 6 and an exhaust pipe 7. The regulating valve 1 is used to accurately control the gas flow and pressure to ensure that the pressure of the gas entering the pressure stabilizing cylinder 3 is within the set range, and the flow meter 2 is used to monitor and record the gas flow entering the pressure stabilizing cylinder 3 in real time to ensure the stability of the airflow and the accuracy of the data during the test, thereby providing a reliable control and monitoring means for the flow measurement of the vortex flow meter.

[0040] Reference Figure 2 and Figure 3 The vortex flow test device includes a pressure stabilizing cylinder 3 and a vortex flow test piece 4. The input end of the pressure stabilizing cylinder 3 is used to input high-pressure air. The vortex flow test piece 4 is arranged at the output end of the pressure stabilizing cylinder 3. The vortex flow test piece 4 includes a primary vortex flow device 401 fixture and a secondary vortex flow device 411 fixture for fixing a secondary vortex flow device 411; the primary vortex flow device 401 fixture is provided with a primary vortex flow device 401 installation groove for installing the primary vortex flow device 401, and a simulated flow channel 405 corresponding to the primary vortex flow device 401 is arranged at the center of the primary vortex flow device 401 fixture. A primary vortex flow device 401 plug for blocking the primary vortex flow device 401 is arranged on the end face of the primary vortex flow device 401; the secondary vortex flow device 411 fixture is provided with a secondary vortex flow device 411 installation groove for installing the secondary vortex flow device 411, and the secondary vortex flow device 411 is provided with a simulated flow channel 405 corresponding to the primary vortex flow device 401. A plug for sealing the secondary vortex finder 411 is arranged on the end face of the first vortex finder 401; by inputting stable high-pressure air into the pressure stabilizing cylinder 3, the air source is ensured to be stable, thereby providing reliable conditions for the vortex finder flow test; the first and second vortex finder 411 fixtures are respectively used to fix and test the vortex finders, wherein the mounting groove and the simulated flow channel 405 of the first vortex finder 401 fixture are designed to accurately simulate the actual working state of the vortex finder, so that the test flow is closer to the actual use; at the same time, the plug arranged on the end face of the first 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 of the first and second 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 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. A secondary vortex finder 411 mounting hole is also provided on the fixture of the secondary vortex finder 411, and the venturi 417 structure extends into the mounting hole of the secondary vortex finder 411; by designing the profile and throat diameter in the simulated flow channel 405 that are exactly the same as the venturi 417 structure of the secondary vortex finder 411, the simulated flow channel 405 can accurately replicate the fluid flow characteristics of the secondary vortex finder 411 under actual working conditions, thereby ensuring that the air flow rate and flow field distribution during the test are consistent with those in actual use. This design effectively improves the accuracy and representativeness of the test results, and provides more reliable experimental data support for evaluating the performance of the secondary vortex finder 411.

[0042] 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. By designing the depth of the installation groove of the first-stage vortex finder 401 to be equal to the thickness of the installation surface of the first-stage vortex finder 401, it is ensured that the first-stage vortex finder 401 can be completely embedded in the installation groove, and a stable installation and good sealing are achieved; and the depth of the installation groove of the second-stage vortex finder 411 is designed to be less than the thickness of the end surface of the second-stage vortex finder 411, so that the second-stage vortex finder 411 will be partially exposed during installation, which increases 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 installation groove 404 is provided on the plane of the primary vortex finder 401 installation groove, and a primary O-type sealing ring 403 is provided in the primary sealing ring installation groove 404, which is used for sealing the installation end face of the primary vortex finder 401; a secondary sealing ring installation groove 404 is provided on the plane of the secondary vortex finder 411 installation groove, and a secondary O-type sealing ring 403 is provided in the secondary sealing ring installation groove 404, which is used for sealing the installation end face of the secondary vortex finder 411. By respectively providing corresponding sealing ring installation grooves 404 on the planes of the primary and secondary vortex finder 411 installation grooves, and installing O-type sealing rings 403 therein, it is ensured that the primary and secondary vortex finders 411 can achieve effective sealing of the end faces during installation, preventing airflow leakage during the test process, further improving the accuracy and reliability of the test, and at the same time ensuring the sealing performance of the vortex finder 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 clamp 408 connected to the first-stage vortex finder 401 plug, and the second-stage vortex finder 411 fixture is provided with a second-stage clamp 419 connected to the second-stage vortex finder 411 plug. Both the first-stage clamp 408 and the second-stage clamp 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 convenience and reliability of the device. The clamping member of the lever structure usually includes a lever arm, a fulcrum (pivot point), a clamping block or a pressure plate, a fixed base, and an operating handle, wherein the lever arm is connected to the fixed base through a fulcrum, and the operator applies force through the operating handle to rotate the lever arm around the fulcrum, and applies a large clamping force to the vortex finder plug through the clamping block or the 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, and the temperature test probe and the pressure test probe 5 are distributed at the center position of the axial direction of the pressure stabilizing cylinder 3. In the test process, the gas temperature and pressure in the pressure stabilizing cylinder 3 can be accurately measured in real time. Such an 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 probe and the pressure test probe 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 primary vortex finder 401 fixture to test the air flow of the primary vortex finder 401, and correcting the test result.

[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 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.

[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 uses the regulating valve 1 to control the air pressure entering the pressure stabilizing cylinder 3, and after the air pressure is stabilized, the air flow through the vortex finder is measured by the flow meter 2, and the environmental parameters such as the temperature and pressure in the pressure stabilizing cylinder 3 are recorded at the same time, and 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 result.

[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 at 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 in 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, then adjust the air pressure entering the pressure stabilizing cylinder 3 to maintain it within the test requirements, and use the flow meter 2 to measure the air flow through the secondary vortex finder 411 after the air pressure stabilizes, and record the temperature, pressure and other environmental parameters in the pressure stabilizing cylinder 3. Then, the known flow data of the standard parts is used for correction to eliminate the influence of equipment differences and environmental conditions on the test results, thereby obtaining 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 double-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, ensures that the airflow distribution and combustion efficiency in actual applications achieve the best effect, 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 standard air flow M1, query the standard air flow Mb recorded by the standard, and calculate the correction coefficient ε=Mb / M1; In this step, first measure the actual air flow M1 of the standard. The standard is a reference device whose air flow is known, and its flow Mb under standard conditions is known and reliable. By measuring M1 and comparing it with the standard flow 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 exact values ​​under standard conditions.

[0058] Step Y2: Test the air flow Mi of the primary vortex finder 401 or the secondary 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 primary vortex finder 401 or the secondary vortex finder 411) to obtain a preliminary flow value Mi. This measurement is carried out under the same experimental conditions, which are consistent with the measurement conditions of the standard parts, to ensure that the correction factor can be applied to the 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 tested in step Y2, and the corrected flow Mj = ε × Mi. Multiply the vortex finder flow Mi measured in the previous step by the correction coefficient ε to calculate the corrected flow Mj, that is, Mj = ε × Mi. Through this correction, Mi is adjusted to a flow value Mj consistent with standard conditions. The correction process eliminates the influence of equipment errors and environmental variables, so that the final flow value Mj can more accurately represent 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 the 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 flow meter under standard test conditions, making the flow data measured by different equipment and different environments comparable, which is conducive to unifying the evaluation standards during the design, production and quality control process; 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 in multiple measurements or cross-device testing, to maintain consistency.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 simulated flow channel (405) corresponding to the first-stage vortex finder (401) is arranged 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 arranged 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 primary sealing ring installation groove (404) is arranged on the plane of the primary vortex finder (401) installation groove, and a primary O-type sealing ring (403) is arranged in the primary sealing ring installation groove (404) for sealing the installation end face of the primary vortex finder (401); a secondary sealing ring installation groove (404) is arranged on the plane of the secondary vortex finder (411) installation groove, and a secondary O-type sealing ring (403) is arranged in the secondary sealing ring installation groove (404) for sealing the installation end face of the secondary 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 clamping 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 clamping piece (419) connected to the second-stage vortex finder (411) plug. Both the first-stage clamping piece (408) and the second-stage clamping piece (419) are lever structures.

5. The vortex flow test device according to claim 1, characterized in that: The vortex flow test device also includes a regulating valve (1) and a flow meter (2) connected to the input end of the pressure stabilizing cylinder (3); the 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 flow test method, characterized in that: The steps include: Step S1: using a primary vortex finder (401) fixture to test the air flow of the primary vortex finder (401), and correcting the test result; Step S2: using a secondary vortex finder (411) fixture to test the air flow of the secondary vortex finder (411), and correcting the test result; Step S3: arranging the first-stage vortex finder (401) and the second-stage vortex finder (411) from small to large according to the corrected flow value, and forming a double-stage vortex finder combination according to the matching method of "small matches small" and "large matches large"; 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 flow test method according to claim 7, characterized in that: The method for correcting the test results in step 1 and step 2 includes: 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 tested in step Y2, and the corrected flow rate Mj=ε×Mi.

9. The vortex flow test method according to claim 8, characterized in that: The method of using a primary vortex finder (401) fixture to test the air flow of the primary vortex finder (401) comprises: The primary vortex finder (401) is mounted on a primary vortex finder (401) fixture, and is sealed with a primary vortex finder (401) plug, and the primary 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 flow 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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