A visualization test system and method for a heavy-duty gas turbine inlet duct

Abstract

The present application belongs to the technical field of impeller machine test measurement, and discloses a visual test system and method for an inlet passage of a heavy-duty gas turbine, wherein the system comprises an inlet fan, a pressure stabilizing chamber, an outlet fan, a flow meter, a particle image velocimetry component, a probe measurement component and an inlet passage model test piece; the particle image velocimetry component is used to obtain two-dimensional velocity data of gas at the outlet of the inlet passage model test piece; and the probe measurement component is used to determine the circumferential gas flow field parameter distribution at the outlet of the inlet passage model test piece according to the obtained gas velocity information and pressure information at different circumferential positions of the outlet of the inlet passage model test piece. The experimental system of the present application combines the particle image velocimetry component with the probe measurement component, and uses the probe experimental results obtained by the probe measurement component to check the experimental results of the particle image velocimetry component, thereby improving the accuracy of measurement.

Description

Technical Field

[0001] This invention belongs to the field of turbomachinery testing and measurement technology, and specifically relates to a visualization testing system and method for the air intake of a heavy-duty gas turbine. Background Technology

[0002] With the continuous growth of energy demand, gas turbines, as efficient and clean energy conversion devices, are widely used in power generation, petrochemicals, and other fields. Heavy-duty gas turbines, in particular, have become an important component of the modern energy industry due to their high power output and low emissions. However, the intake duct, as a crucial auxiliary component of heavy-duty gas turbines, directly affects compressor efficiency and, consequently, overall turbine performance through its airflow uniformity and losses. Therefore, accurate flow testing and analysis of heavy-duty gas turbine intake ducts are essential.

[0003] Current gas turbine inlet design typically relies on numerical simulations and probe tests. However, while numerical simulations can provide some design guidance, they may deviate from actual conditions. Probe tests, which yield high-resolution flow field results, require complex equipment, high testing costs, and significant time investment. Furthermore, contact-based physical probes can significantly interfere with the flow field and reduce test accuracy, posing challenges to flow analysis and design optimization within the inlet. Currently, non-contact measurement methods, such as particle image velocity measurement (PIV), are widely used in turbomachinery measurement. Using the PIV method, high spatial resolution flow parameter distributions at the inlet outlet can be obtained quickly and accurately, providing support for flow analysis and gas turbine inlet optimization design.

[0004] However, existing PIV methods suffer from poor particle tracking in near-wall flow testing, resulting in low accuracy in this area. Therefore, developing a coupled PIV and physical probe testing method, combining the advantages of both methods, is one way to achieve high-precision measurement of gas turbine inlet ducts. Summary of the Invention

[0005] To address the above problems, this invention provides a visualization testing system and method for the intake duct of a heavy-duty gas turbine, employing the following technical solution:

[0006] A visualization test system for the intake duct of a heavy-duty gas turbine includes an inlet fan, a pressure stabilizing chamber, an outlet fan, a flow meter, a particle image velocimetry component, a probe measurement component, and an intake duct model test piece.

[0007] The outlet of the inlet fan is connected to the inlet of the inlet duct model test piece, the inlet of the pressure stabilizing chamber is connected to the outlet of the inlet fan, the outlet of the pressure stabilizing chamber is connected to the inlet of the inlet duct model test piece, the outlet of the inlet duct model test piece is connected to the inlet of the outlet fan through a pipeline component, and the flow meter is installed on the pipeline component.

[0008] The particle image velocimetry component is used to acquire two-dimensional gas velocity data at the outlet of the inlet model test piece; the probe measurement component is used to determine the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece based on the acquired gas velocity and pressure information at different circumferential positions at the outlet of the inlet model test piece.

[0009] Furthermore, it also includes a fan control cabinet, which is electrically connected to the inlet fan and the outlet fan.

[0010] Furthermore, the particle image velocimetry component includes a particle generator, a laser sheet light source, a camera, and a synchronizer, and the pipeline component includes a first air intake pipeline;

[0011] The particle generator's outlet is connected to the inlet of the inlet fan. The laser sheet light source is configured to switch between the two sides of the first air intake duct. One end of the first air intake duct is connected to the outlet of the air intake model test piece, and the other end of the first air intake duct is connected to the inlet of the outlet fan. The synchronizer is communicatively connected to the laser sheet light source and the camera, and the camera is located downstream of the first air intake duct.

[0012] Furthermore, the piping component also includes a cubic window, which is disposed between the outlet of the first air intake pipe and the inlet of the outlet fan.

[0013] Furthermore, the probe measurement component includes an inlet total pressure probe, an outlet five-hole probe, an outlet boundary layer probe, a probe displacement mechanism, a pressure scanning valve, and an atmospheric pressure sensor; the pipeline component includes a second air intake pipeline.

[0014] The second intake pipe has one end configured to connect to the outlet of the intake model test piece, and the other end configured to connect to the inlet of the outlet fan. The pressure scanning valve is connected to the inlet total pressure probe, the outlet five-hole probe, and the outlet boundary layer probe through a pipe. The outlet boundary layer probe, the pressure scanning valve, and the atmospheric pressure sensor are all installed on the second intake pipe. The inlet total pressure probe is installed at the inlet of the intake model test piece. Multiple probe displacement mechanisms are arranged circumferentially along the second intake pipe, and each probe displacement mechanism is equipped with one outlet five-hole probe.

[0015] Furthermore, the laser sheet light source includes a laser, a light guide arm, a sheet-to-light converter, and a laser displacement mechanism;

[0016] The light guide arm and the sheet light converter are sequentially arranged downstream of the laser, and the sheet light converter is arranged on the laser displacement mechanism.

[0017] Furthermore, the first air intake duct is made of plexiglass.

[0018] Furthermore, the second air intake pipe is made of carbon steel.

[0019] This invention also provides a visualization test method for the inlet of a heavy-duty gas turbine, implemented based on the aforementioned visualization test system for the inlet of a heavy-duty gas turbine, comprising the following steps:

[0020] Start the outlet high-pressure main blower and the inlet blower, monitor the gas flow rate at the outlet of the inlet model test piece through the flow meter, and adjust the power of the outlet high-pressure main blower and the inlet blower so that the gas flow rate at the outlet of the inlet model test piece reaches the set value.

[0021] PIV tests were conducted using a particle image velocimetry (PIV) device to obtain two-dimensional velocity data of the gas at the outlet of the inlet model test piece.

[0022] Probe tests are conducted using a probe measurement component. Based on the gas velocity and pressure information obtained at different circumferential positions at the outlet of the inlet model test piece, the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece is determined. The PIV test results are verified by the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece, and the flow field parameters of the near-wall region at the outlet of the inlet model test piece are supplemented.

[0023] Furthermore, a PIV test is conducted using a particle image velocimetry (PIV) device to obtain two-dimensional gas velocity data at the outlet of the inlet model test piece, including the following steps:

[0024] Start the particle generator, adjust the position of the laser sheet light source so that the laser plane emitted by the laser sheet light source coincides with the position of the cross section to be measured in the first air intake pipe, and adjust the camera focal length so that the camera focal plane coincides with the cross section to be measured.

[0025] The laser sheet light source is controlled by a synchronizer to trigger and the camera exposure is synchronized, and the camera acquires a test cross-section photo A on one side of the first air intake duct.

[0026] The position of the laser sheet light source is changed to the other side of the first air intake pipe so that the laser plane emitted by the laser sheet light source coincides with the position of the cross section to be measured in the first air intake pipe. The triggering of the laser sheet light source and the exposure of the camera are synchronized by the synchronizer. The camera acquires the cross section B to be measured on the other side of the first air intake pipe.

[0027] Based on photographs A and B of the cross-section to be tested, determine the two-dimensional velocity data of the gas at the outlet of the inlet model test piece.

[0028] The beneficial effects of this invention are:

[0029] 1. The experimental system of this invention combines a particle image velocimetry component with a probe measurement component. The probe experiment results performed by the probe measurement component are used to verify the experimental results of the particle image velocimetry component, thereby improving the accuracy of the measurement.

[0030] 2. The particle image velocimetry component of this invention can obtain detailed flow field information at the air intake outlet for subsequent analysis and design.

[0031] 3. The experimental system of this invention ensures the accuracy of the PIV test by the particle image velocimetry component through the use of a voltage stabilizing cavity, a cubic window, and a light-blocking structure, and obtains reliable test results.

[0032] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1A schematic diagram of a visualization test system for a heavy-duty gas turbine inlet is shown according to an embodiment of the present invention.

[0035] Figure 2 A schematic diagram of the installation of the first intake duct and the intake duct model test piece according to an embodiment of the present invention is shown;

[0036] Figure 3 A diagram showing the PIV optical scheme arrangement during a PIV experiment according to an embodiment of the present invention is provided.

[0037] Figure 4 A schematic diagram of the installation of the second air intake pipe and the air intake model test piece according to an embodiment of the present invention is shown.

[0038] In the figure: 1. Inlet fan; 2. Pressure stabilizing chamber; 3. Fan control cabinet; 4. Piping components; 5. Outlet fan; 6. Flow meter; 7. Inlet duct model test piece; 8. Particle generator; 9. Laser sheet light source; 10. Camera; 11. First inlet duct pipeline; 12. Viewing window; 13. Connecting pipe; 14. Section to be measured; 15. Outlet five-hole probe; 16. Probe displacement mechanism; 17. Second inlet duct pipeline; 18. Photograph A of the section to be measured; 19. Photograph B of the section to be measured. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0041] This invention provides a visualization test system and method for the intake duct of a heavy-duty gas turbine. By proposing a corresponding wind tunnel test rig construction scheme and constructing an optical and probe coupled test scheme, detailed flow field information at the intake duct outlet can be obtained, providing support for high-precision testing of the intake duct of heavy-duty gas turbines.

[0042] like Figure 1 As shown, a visualization test system for the intake duct of a heavy-duty gas turbine includes an inlet fan 1, a pressure stabilizing chamber 2, a fan control cabinet 3, an outlet fan 5, a flow meter 6, a particle image velocity measuring component, a probe measuring component, and an intake duct model test piece 7.

[0043] The outlet of the inlet fan 1 is connected to the inlet of the inlet model test piece 7, and the outlet of the inlet model test piece 7 is connected to the inlet of the outlet fan 5 through the pipeline component 4. The flow meter 6 is installed on the pipeline component 4.

[0044] The fan control cabinet 3 is electrically connected to the inlet fan 1 and the outlet fan 5. The gas flow rate in the pipeline component 4 is obtained through the flow meter 6. The fan control cabinet 3 is used to adjust the power of the inlet fan 1 and the outlet fan 5 according to the monitored gas flow rate in the pipeline component 4, so as to achieve the gas flow rate required for the experiment.

[0045] The particle image velocimetry component is used to acquire two-dimensional gas velocity data at the outlet of the inlet model test piece 7; the probe measurement component is used to determine the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7 based on the acquired gas velocity and pressure information at different circumferential positions at the outlet of the inlet model test piece 7.

[0046] The probe measurement component is also used to verify the PIV test results by measuring the flow field parameter distribution of the circumferential gas at the outlet of the inlet model test piece 7, and to supplement the flow field parameters of the near-wall region at the outlet of the inlet model test piece 7.

[0047] The inlet of the pressure stabilizing chamber 2 is connected to the outlet of the inlet fan 1, and the outlet of the pressure stabilizing chamber 2 is connected to the inlet of the inlet model test piece 7. The pressure stabilizing chamber 2 is not only beneficial to the PIV test, but also ensures the uniformity of the inlet flow of the inlet of the inlet model test piece 7.

[0048] like Figure 1 and Figure 2 As shown, for example, the particle image velocimetry component includes a particle generator 8, a laser sheet light source 9, a camera 10, a synchronizer, and a data analysis module, and the pipeline component 4 includes a first air intake pipeline 11.

[0049] The particle generator 8 is connected to the inlet of the inlet fan 1. The particle generator 8 is connected to the inlet fan 1 and then passes through the pressure stabilizing chamber 2. This can make the airflow distribution uniform within a short distance and make the tracer particles diffuse evenly. Together with the outlet fan 5, it forms a front-blowing and rear-suction mode to simulate the actual operation of the air intake.

[0050] For example, when conducting PIV tests using particle image velocimetry components, the visualization test system for the heavy-duty gas turbine inlet operates in a darkroom, and the inner cone portion of the inlet model test piece 7 is shielded to avoid the influence of laser reflection.

[0051] For example, because the inner cone portion of the intake duct model test piece 7 will obstruct the laser, the PIV test needs to be conducted in two separate tests, and the results are then stitched together. The position of the camera 10 remains unchanged in both tests, while the position of the laser sheet light source 9 is configured to switch between the two sides of the first intake duct 11.

[0052] For example, the laser sheet light source 9 includes a laser, a light guide arm, a sheet light converter, and a laser displacement mechanism. The light guide arm and the sheet light converter are sequentially arranged downstream of the laser. The sheet light converter is arranged on the laser displacement mechanism. The light guide arm is used to change the direction of the laser emitted by the laser and guide the laser to the sheet light converter. The sheet light converter is used to convert the laser into a sheet light source to illuminate the cross section 14 to be measured on the first air inlet pipe 11. The laser displacement mechanism is used to adjust the position of the sheet light converter or the laser so that the laser plane coincides with the position of the cross section 14 to be measured.

[0053] One end of the first air intake pipe 11 is configured to connect to the outlet of the air intake model test piece 7, and the other end of the first air intake pipe 11 is configured to connect to the inlet of the outlet fan 5. For example, the first air intake pipe 11 is made of plexiglass.

[0054] The synchronizer is communicatively connected to the laser sheet light source 9 and the camera 10. The synchronizer is used to control the laser sheet light source 9 to trigger and synchronize the exposure with the camera 10. The camera 10 is located downstream of the first air intake duct 11.

[0055] like Figure 2 As shown, the pipeline component 4 also includes a cubic window 12, which is located between the outlet of the first air intake pipeline 11 and the inlet of the outlet fan 5, and can reduce optical distortion during measurement.

[0056] For example, the piping component 4 also includes a connecting pipe 13, through which the window 12 is connected to the outlet of the first air intake pipe 11.

[0057] The data analysis module is used to analyze the photos of the test section 14 on both sides of the first air intake pipe 11 acquired from the camera 10, obtain the gas velocity distribution of the test section 14 on both sides of the first air intake pipe 11, and stitch the gas velocity distribution of the test section 14 on both sides of the first air intake pipe 11 to obtain the two-dimensional gas velocity data at the outlet of the air intake model test piece 7.

[0058] like Figure 4 As shown, for example, the probe measurement component includes an inlet total pressure probe, an outlet five-hole probe 15, an outlet boundary layer probe, a probe displacement mechanism 16, a pressure scanning valve, an atmospheric pressure sensor, and a data processing module, and the pipeline component 4 includes a second air intake pipeline 17.

[0059] One end of the second air intake pipe 17 is configured to connect to the outlet of the air intake model test piece 7, and the other end of the second air intake pipe 17 is configured to connect to the inlet of the outlet fan 5. For example, the material of the second air intake pipe 17 is carbon steel.

[0060] It should be noted that when conducting PIV tests using the particle image velocimetry component, the first air intake pipe 11 is connected to the outlet of the air intake model test piece 7, and when conducting probe tests using the probe measurement component, the second air intake pipe 17 is connected to the outlet of the air intake model test piece 7.

[0061] The pressure scanning valve is connected to the inlet total pressure probe, the outlet five-hole probe 15, and the outlet boundary layer probe through pipelines. The pressure scanning valve is also connected to the data processing module. The outlet boundary layer probe, the pressure scanning valve, and the atmospheric pressure sensor are all installed on the second air intake pipeline 17.

[0062] An inlet total pressure probe is installed at the inlet of the inlet of the inlet model test piece 7 to transmit the gas pressure at the inlet of the inlet of the inlet of the inlet model test piece 7 to the pressure scanning valve. Multiple probe displacement mechanisms 16 are evenly distributed along the circumference of the second inlet pipe. Each probe displacement mechanism 16 is equipped with an outlet five-hole probe 15, which is used to transmit the gas pressure inside the second inlet pipe 17 to the pressure scanning valve. The probe displacement mechanism 16 is used to adjust the position of the outlet five-hole probe 15, which acquires the pressure at different positions inside the second inlet pipe 17. It should be noted that the outlet five-hole probe 15 and the outlet boundary layer probe are interchangeable.

[0063] The outlet boundary layer probe is used to transmit the gas pressure near the wall of the second air intake pipe 17 to the pressure scanning valve, and the atmospheric pressure sensor is used to send the acquired atmospheric pressure value during the experiment to the data processing module.

[0064] The pressure scanning valve converts the gas pressure at the inlet of the intake model test piece 7, the pressure at different locations inside the second intake pipe 17, and the gas pressure near the pipe wall of the second intake pipe 17 into electrical signals and sends them to the data processing module.

[0065] The data processing module is used to determine the total gas pressure and velocity at the outlet of the inlet of the inlet model test piece 7, as well as the circumferential gas flow field parameter distribution at the outlet of the inlet of the inlet model test piece 7, based on the gas pressure at the inlet of the inlet of the inlet model test piece 7, the pressure at different positions inside the second inlet pipe 17, the gas pressure near the pipe wall of the second inlet pipe 17, and the atmospheric pressure value.

[0066] Based on the aforementioned visualization test system for heavy-duty gas turbine inlets, this embodiment of the invention also provides a visualization test method for heavy-duty gas turbine inlets, comprising the following steps:

[0067] S1. Start the outlet high-pressure main blower and the inlet blower 1. Monitor the gas flow rate at the outlet of the inlet model test piece 7 through the flow meter 6. Adjust the power of the outlet high-pressure main blower and the inlet blower 1 through the blower control cabinet 3 so that the gas flow rate at the outlet of the inlet model test piece 7 reaches the set value (the flow rate required for the experiment).

[0068] S2. Conduct a PIV test using a particle image velocimetry component to obtain two-dimensional gas velocity data at the outlet of the inlet model test piece 7, including the following steps:

[0069] S21. Start the particle generator 8, adjust the position of the laser sheet light source 9 so that the laser plane emitted by the laser sheet light source 9 coincides with the position of the cross section 14 to be measured of the first air intake pipe 11, adjust the position of the camera 10 so that the camera 10 is facing the outlet of the first air intake pipe 11, and adjust the focal length of the camera 10 so that the focal plane of the camera 10 coincides with the cross section 14 to be measured.

[0070] S22. Start the laser sheet light source 9, synchronizer, and camera 10. Control the laser sheet light source 9 to trigger and synchronize the exposure with the camera 10 through the synchronizer. Figure 3 As shown, a photograph A18 of the cross-section to be tested on one side of the first air intake pipe 11 is obtained by camera 10.

[0071] S23, such as Figure 3 As shown, the position of the laser sheet light source 9 is changed to the other side of the first air intake pipe 11, so that the laser plane emitted by the laser sheet light source 9 coincides with the position of the test section 14 of the first air intake pipe 11. The triggering of the laser sheet light source 9 is controlled by the synchronizer to synchronize with the exposure of the camera 10. The camera 10 acquires the test section photo B19 on the other side of the first air intake pipe 11.

[0072] S24. Based on photographs A18 and B19 of the section to be tested, determine the two-dimensional gas velocity data at the outlet of the inlet model test piece 7, including the following steps:

[0073] The data analysis module analyzes the photograph A18 of the test section on one side of the first air intake pipe 11 acquired from the camera 10 to obtain the gas velocity distribution of the test section 14 on one side of the first air intake pipe 11.

[0074] The data analysis module analyzes the photograph B19 of the test section on the other side of the first air intake pipe 11 acquired from the camera 10 to obtain the gas velocity distribution of the test section 14 on the other side of the first air intake pipe 11.

[0075] The gas velocity distribution of the test sections 14 on both sides of the first intake pipe 11 is spliced ​​to obtain the two-dimensional gas velocity data at the outlet of the intake model test piece 7.

[0076] S3. Conduct probe tests using probe measurement components. Based on the gas velocity and pressure information obtained at different circumferential positions at the outlet of the inlet model test piece 7, determine the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7. Verify the PIV test results using the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7, and supplement the flow field parameters in the near-wall region at the outlet of the inlet model test piece 7. This includes the following steps:

[0077] S31. Replace the first intake pipe 11 at the outlet of the intake manifold model test piece 7 with the second intake pipe 17. Install an inlet total pressure probe at the inlet of the intake manifold model test piece 7. Install an outlet boundary layer probe, a probe displacement mechanism 16, a pressure scanning valve, and an atmospheric pressure sensor on the second intake pipe 17. Install an outlet five-hole probe 15 on the probe displacement mechanism 16. Connect the inlet total pressure probe, the outlet five-hole probe 15, the outlet boundary layer probe, the atmospheric pressure sensor, and the data processing module to the pressure scanning valve.

[0078] S32. Start the outlet high-pressure main blower and the inlet blower 1. Monitor the gas flow rate at the outlet of the inlet model test piece 7 through the flow meter 6. Adjust the power of the outlet high-pressure main blower and the inlet blower 1 through the blower control cabinet 3 so that the gas flow rate at the outlet of the inlet model test piece 7 reaches the set value (the flow rate required for the experiment).

[0079] S33, the inlet total pressure probe transmits the gas pressure at the inlet of the inlet model test piece 7 to the pressure scanning valve; the outlet five-hole probe 15 transmits the gas pressure inside the second inlet pipe 17 to the pressure scanning valve; the outlet boundary layer probe transmits the gas pressure near the pipe wall of the second inlet pipe 17 to the pressure scanning valve; the atmospheric pressure sensor is used to send the acquired atmospheric pressure value during the experiment to the data processing module.

[0080] S34. The data processing module determines the total gas pressure and velocity at the outlet of the inlet of the inlet model test piece 7, as well as the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7, based on the gas pressure at the inlet of the inlet model test piece 7 obtained from the pressure scanning valve, the gas pressure at different positions inside the second inlet pipe 17, the gas pressure near the pipe wall of the second inlet pipe 17, and the atmospheric pressure value.

[0081] S35. Change the position of the five-hole probe 15 at the outlet by means of the probe displacement mechanism 16, and repeat steps S32-S34 to obtain gas velocity and pressure information at different positions in the circumferential direction of the outlet of the intake model test piece 7.

[0082] S36. Based on the gas velocity and pressure information at different circumferential positions at the outlet of the inlet model test piece 7, determine the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7. Verify the PIV test results through the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece 7, and supplement the flow field parameters in the near-wall region at the outlet of the inlet model test piece 7.

[0083] The embodiments of the present invention can effectively design test benches for tracer particle dispersion, PIV optical experiments and probe testing, and can obtain the flow characteristics of the inlet outlet.

[0084] The embodiments of the present invention demonstrate that detailed flow field information at the intake outlet can be obtained using PIV technology, which can be used for subsequent analysis and design.

[0085] The visualization test system of this invention ensures the accuracy of the PIV test and obtains reliable test results by setting a pressure stabilizing cavity 2 in the air path, setting a cubic window 12 in the optical path, and using a cone-shaped light-blocking treatment on the inner cone of the air intake model test piece 7.

[0086] The visualization test system of this invention combines the PIV test with the traditional probe test, and uses the probe test results to verify the PIV test results, thereby further improving the accuracy of the measurement.

[0087] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A visualization test system for the intake duct of a heavy-duty gas turbine, characterized in that, It includes an inlet fan (1), a pressure stabilizing chamber (2), an outlet fan (5), a flow meter (6), a particle image velocimetry component, a probe measurement component, and an inlet duct model test piece (7); The outlet of the inlet fan (1) is connected to the inlet of the inlet duct model test piece (7), the inlet of the pressure stabilizing chamber (2) is connected to the outlet of the inlet fan (1), the outlet of the pressure stabilizing chamber (2) is connected to the inlet of the inlet duct model test piece (7), the outlet of the inlet duct model test piece (7) is connected to the inlet of the outlet fan (5) through the pipeline component (4), and the flow meter (6) is installed on the pipeline component (4). The particle image velocimetry component is used to acquire two-dimensional gas velocity data at the outlet of the inlet model test piece (7); the probe measurement component is used to determine the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece (7) based on the gas velocity and pressure information at different circumferential positions at the outlet of the inlet model test piece (7). The particle image velocity measurement component includes a particle generator (8), a laser sheet light source (9), a camera (10), and a synchronizer; the pipeline component (4) includes a first air intake pipeline (11). The particle generator (8) is connected to the inlet of the inlet fan (1), the laser sheet light source (9) is configured to switch between the two sides of the first air intake pipe (11), one end of the first air intake pipe (11) is connected to the outlet of the air intake model test piece (7), and the other end of the first air intake pipe (11) is connected to the inlet of the outlet fan (5). The synchronizer is communicatively connected to the laser sheet light source (9) and the camera (10), and the camera (10) is located downstream of the first air intake pipe (11). The pipeline component (4) also includes a cubic window (12), which is disposed between the outlet of the first air intake pipeline (11) and the inlet of the outlet fan (5); The probe measurement components include an inlet total pressure probe, an outlet five-hole probe (15), an outlet boundary layer probe, a probe displacement mechanism (16), a pressure scanning valve, and an atmospheric pressure sensor. The pipeline components (4) include a second air intake pipeline (17). One end of the second intake pipe (17) is configured to be connected to the outlet of the intake model test piece (7), and the other end of the second intake pipe (17) is configured to be connected to the inlet of the outlet fan (5). The pressure scanning valve is connected to the inlet total pressure probe, the outlet five-hole probe (15), and the outlet boundary layer probe through a pipe. The outlet boundary layer probe, the pressure scanning valve, and the atmospheric pressure sensor are all installed on the second intake pipe (17). The inlet total pressure probe is installed at the inlet of the intake model test piece (7). Multiple probe displacement mechanisms (16) are arranged circumferentially along the second intake pipe (17), and each probe displacement mechanism (16) is provided with one outlet five-hole probe (15).

2. The visualization test system for the heavy-duty gas turbine inlet according to claim 1, characterized in that, It also includes a fan control cabinet (3), which is electrically connected to the inlet fan (1) and the outlet fan (5).

3. The visualization test system for the heavy-duty gas turbine inlet according to claim 1, characterized in that, The laser sheet light source (9) includes a laser, a light guide arm, a sheet light converter, and a laser displacement mechanism; The light guide arm and the sheet light converter are sequentially arranged downstream of the laser, and the sheet light converter is arranged on the laser displacement mechanism.

4. The visualization test system for the heavy-duty gas turbine inlet according to claim 1, characterized in that, The first air intake pipe (11) is made of plexiglass.

5. The visualization test system for the heavy-duty gas turbine inlet according to claim 1, characterized in that, The second air intake pipe (17) is made of carbon steel.

6. A visual testing method for the intake duct of a heavy-duty gas turbine, characterized in that, The visualization test system based on the heavy-duty gas turbine inlet as described in any one of claims 1-5 is implemented, including the following steps: Start the outlet high-pressure main blower and the inlet blower (1), monitor the gas flow rate at the outlet of the inlet model test piece (7) through the flow meter (6), adjust the power of the outlet high-pressure main blower and the inlet blower (1) so that the gas flow rate at the outlet of the inlet model test piece (7) reaches the set value. The PIV test was conducted using a particle image velocimetry device to obtain two-dimensional velocity data of the gas at the outlet of the inlet model test piece (7). The probe test is conducted by the probe measurement component. Based on the gas velocity and pressure information at different circumferential positions of the inlet model test piece (7) outlet, the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece (7) is determined. The PIV test results are verified by the circumferential gas flow field parameter distribution at the outlet of the inlet model test piece (7), and the flow field parameters of the near-wall region at the outlet of the inlet model test piece (7) are supplemented.

7. The visualization test method for the intake duct of a heavy-duty gas turbine according to claim 6, characterized in that, The PIV test was conducted using a particle image velocimetry device to obtain two-dimensional gas velocity data at the outlet of the inlet model test piece (7), including the following steps: Start the particle generator (8), adjust the position of the laser sheet light source (9) so that the laser plane emitted by the laser sheet light source (9) coincides with the position of the test section (14) of the first air intake pipe (11), and adjust the focal length of the camera (10) so that the focal plane of the camera (10) coincides with the test section (14). The laser sheet light source (9) is controlled by a synchronizer to trigger and the camera (10) to expose synchronously. The camera (10) acquires a photograph A (18) of the cross section to be tested on one side of the first air intake pipe (11). The position of the laser sheet light source (9) is changed to the other side of the first air intake pipe (11) so that the laser plane emitted by the laser sheet light source (9) coincides with the position of the test section (14) of the first air intake pipe (11). The laser sheet light source (9) is triggered and the camera (10) is exposed synchronously through the synchronizer. The camera (10) acquires the test section photo B (19) on the other side of the first air intake pipe (11). Based on the test section photograph A (18) and the test section photograph B (19), the two-dimensional velocity data of the gas at the outlet of the inlet model test piece (7) are determined.

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