Visual test system and method for air inlet channel of heavy-duty gas turbine

Abstract

The invention belongs to the technical field of impeller mechanical test and measurement, and discloses a visual test system and method for a heavy duty gas turbine inlet duct, and the system comprises an inlet fan, a pressure stabilizing cavity, an outlet fan, a flowmeter, a particle image velocity measurement part, a probe measurement part, and an inlet duct model test piece. The particle image velocity measurement component is used for acquiring gas two-dimensional velocity data of an outlet of the gas inlet channel model test piece; and the probe measuring part is used for determining the circumferential gas flow field parameter distribution of the outlet of the air inlet duct model test piece according to the obtained gas velocity information and pressure information at different circumferential positions of the outlet of the air inlet duct model test piece. According to the experimental system provided by the embodiment of the invention, the particle image velocity measurement part is combined with the probe measurement part, and the experimental result of the particle image velocity measurement part is checked by using the probe experimental result of the probe measurement part, so that the measurement accuracy is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of impeller machinery testing and measurement, and in particular relates to a visual testing system and method for an air inlet of a heavy-duty gas turbine. Background Art

[0002] With the continuous growth of energy demand, gas turbines, as an efficient and clean energy conversion device, have been widely used in the fields of electricity, petrochemicals, etc. In particular, heavy-duty gas turbines have become an important part of the modern energy industry due to their high power output and low emission characteristics. However, as an important auxiliary component of heavy-duty gas turbines, the air flow uniformity and loss of the inlet duct directly affect the efficiency of the compressor, and thus affect the performance of the whole machine. Therefore, it is very important to accurately test and analyze the flow of the heavy-duty gas turbine inlet duct.

[0003] Existing gas turbine inlet designs usually rely on numerical simulations and probe tests. However, although numerical simulations can provide certain design guidance, there may be deviations from actual conditions. Probe tests require complex equipment, high testing costs and time to obtain high-resolution flow field results, and contact physical probes will significantly interfere with the flow field and reduce the accuracy of flow field tests, which brings difficulties to flow analysis and design optimization in the inlet. At present, some non-contact measurement methods, such as particle image velocimetry (PIV), have been widely used in the field of turbomachinery measurement. Using the PIV method, high spatial resolution flow parameter distribution at the inlet outlet can be quickly and accurately obtained, providing support for flow analysis and gas turbine inlet optimization design.

[0004] However, the existing PIV method has the problem of poor particle tracking when testing near-wall flow, and the test accuracy of near-wall flow is low. Therefore, developing a test method that couples PIV and physical probes and combines the advantages of the two types of measurement methods is a way to achieve high-precision measurement of the gas turbine inlet duct. Summary of the invention

[0005] In view of the above problems, the present invention provides a visualization test system and method for a heavy-duty gas turbine inlet duct, which adopts the following technical solutions:

[0006] A visualization test system for an air inlet of a heavy-duty gas turbine, comprising an inlet fan, a pressure stabilizing chamber, an outlet fan, a flow meter, a particle image velocity measurement component, a probe measurement component and an air inlet 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 arranged on the pipeline component;

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

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

[0010] Further, the particle image velocity measurement component includes a particle generator, a laser sheet light source, a camera and a synchronizer, and the pipeline component includes a first air inlet pipeline;

[0011] Among them, the outlet of the particle generator is connected to the inlet of the inlet fan, the position of the laser sheet light source is configured to switch on both sides of the first air inlet duct, one end of the first air inlet duct is configured to be connected to the outlet of the air inlet model test piece, and the other end of the first air inlet duct is configured to be connected to the inlet of the outlet fan, the synchronizer is communicatively connected with the laser sheet light source and the camera, and the camera is arranged downstream of the first air inlet duct.

[0012] Furthermore, the pipeline component also includes a cube-shaped window, and the cube-shaped window is arranged between the outlet of the first air inlet pipeline and the inlet of the outlet fan.

[0013] Further, 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, and the pipeline component includes a second intake duct pipeline;

[0014] Among them, one end of the second intake duct pipeline is configured to be connected to the outlet of the intake duct model test piece, and the other end of the second intake duct pipeline is configured to be connected 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 pipeline. The outlet boundary layer probe, the pressure scanning valve and the atmospheric pressure sensor are all arranged on the second intake duct pipeline. The inlet total pressure probe is arranged at the inlet of the intake duct model test piece. The probe displacement mechanism is arranged in plurality along the circumference of the second intake duct, and each of the probe displacement mechanisms is provided with one of the outlet five-hole probes.

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

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

[0017] Furthermore, the first air intake pipe is made of organic glass.

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

[0019] The present invention also provides a visualization test method for a heavy-duty gas turbine inlet duct, which is implemented based on the visualization test system for the heavy-duty gas turbine inlet duct, and includes the following steps:

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

[0021] The PIV test is carried out by using the particle image velocimetry component to obtain the two-dimensional velocity data of the gas at the outlet of the inlet duct model test piece;

[0022] A probe test is carried out using a probe measuring component. The circumferential gas flow field parameter distribution at the outlet of the inlet model test piece is determined based on the gas velocity information and pressure information obtained at different circumferential positions of the outlet of the inlet model test piece. The PIV test results are verified using 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 area of ​​the outlet of the inlet model test piece are supplemented.

[0023] Furthermore, a PIV test is performed by a particle image velocimetry component to obtain two-dimensional velocity data of gas at the outlet of the inlet duct 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 section to be measured of the first air inlet pipeline, and adjust the focal length of the camera so that the focal plane of the camera coincides with the section to be measured;

[0025] The laser sheet light source triggering and camera exposure are controlled synchronously by a synchronizer, and a cross-section photo A to be measured on one side of the first air inlet duct is obtained by the camera;

[0026] The laser sheet light source position is changed to the other side of the first air inlet duct, so that the laser plane emitted by the laser sheet light source coincides with the position of the section to be measured of the first air inlet duct, and the laser sheet light source triggering and camera exposure are controlled synchronously by a synchronizer, and a photo B of the section to be measured on the other side of the first air inlet duct is obtained by the camera;

[0027] According to the cross-section photograph A and the cross-section photograph B to be measured, the two-dimensional velocity data of the gas at the outlet of the inlet duct model test piece is determined.

[0028] Beneficial effects of the present invention:

[0029] 1. The experimental system of the embodiment of the present invention combines a particle image velocimetry component with a probe measurement component, and uses the probe experiment results of the probe measurement component to verify the experimental results of the particle image velocimetry component, thereby improving the accuracy of measurement.

[0030] 2. The particle image velocimetry component of the embodiment of the present invention can obtain detailed flow field information at the inlet duct outlet for subsequent analysis and design.

[0031] 3. The experimental system of the embodiment of the present invention ensures the accuracy of the PIV test of the particle image velocimetry component through the pressure stabilizing chamber, the cube window, and the shading treatment of the shielding structure, and obtains reliable test results.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0036] Figure 3 A PIV optical scheme layout diagram for a PIV experiment according to an embodiment of the present invention is shown;

[0037] Figure 4 A schematic diagram of the installation of a second intake duct pipeline and an intake duct 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. pipeline 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. window; 13. connecting pipe; 14. section to be measured; 15. outlet five-hole probe; 16. probe displacement mechanism; 17. second inlet duct pipeline; 18. photo A of the section to be measured; 19. photo B of the section to be measured. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0041] The present invention provides a visualization test system and method for a heavy-duty gas turbine inlet duct. By proposing a corresponding wind tunnel test bench construction plan and constructing an optical and probe coupling test plan, detailed flow field information at the inlet duct outlet can be obtained, providing support for high-precision testing of the heavy-duty gas turbine inlet duct.

[0042] like Figure 1 As shown, a visualization test system for an air inlet 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 measurement component, a probe measurement component and an air inlet model test piece 7.

[0043] Among them, the outlet of the inlet fan 1 is connected with the inlet of the air inlet duct model test piece 7, the outlet of the air inlet duct model test piece 7 is connected with the inlet of the outlet fan 5 through the pipeline component 4, and the flow meter 6 is arranged on the pipeline component 4.

[0044] The fan control cabinet 3 is electrically connected to the inlet fan 1 and the outlet fan 5, and the gas flow 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 in the pipeline component 4, so as to achieve the gas flow required for the experiment.

[0045] The particle image velocimetry component is used to obtain the two-dimensional velocity data of the gas at the outlet of the inlet duct 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 duct model test piece 7 based on the gas velocity information and pressure information at different circumferential positions of the outlet of the inlet duct model test piece 7 obtained.

[0046] The probe measurement component is also used to verify the PIV test results through the flow field parameter distribution of the circumferential gas at the outlet of the inlet duct model test piece 7, and to supplement the flow field parameters of the near-wall area of ​​the outlet of the inlet duct 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 air inlet duct 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 air inlet duct 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 inlet pipeline 11.

[0049] Among them, the outlet of 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. It can make the airflow distribution uniform within a short distance and make the tracer particles diffuse uniformly. It cooperates with the outlet fan 5 to form a front-blowing and rear-suction mode to simulate the actual operation of the air inlet duct.

[0050] For example, when the PIV test is performed by the particle image velocimetry component, the visualization test system of the heavy-duty gas turbine inlet duct is operated in a dark room, and the inner cone part of the inlet duct model test piece 7 is shielded from light to avoid the influence of laser reflection.

[0051] For example, since the inner cone of the air intake model test piece 7 will block the laser, the PIV test needs to be performed twice, and the results are then spliced. The position of the camera 10 remains unchanged during the two tests, and the position of the laser sheet light source 9 is configured to switch between the two sides of the first air intake pipe 11.

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

[0053] Among them, one end of the first air intake duct 11 is configured to be connected to the outlet of the air intake duct model test piece 7, and the other end of the first air intake duct 11 is configured to be connected to the inlet of the outlet fan 5. For example, the first air intake duct 11 is made of organic glass.

[0054] The synchronizer is in communication connection with the laser sheet light source 9 and the camera 10 , and is used to control the triggering of the laser sheet light source 9 and the exposure of the camera 10 to be synchronized, wherein the camera 10 is arranged downstream of the first air inlet pipeline 11 .

[0055] like Figure 2 As shown, the pipeline component 4 further includes a cube-shaped window 12, which is arranged between the outlet of the first air inlet pipeline 11 and the inlet of the outlet fan 5, so as to reduce optical distortion during measurement.

[0056] For example, the pipeline component 4 further includes a connecting pipe 13 , and the viewing window 12 is connected to the outlet of the first intake pipe 11 via the connecting pipe 13 .

[0057] The data analysis module is used to analyze the photos of the cross-section 14 to be measured on both sides of the first intake duct pipeline 11 obtained from the camera 10, obtain the gas velocity distribution of the cross-section 14 to be measured on both sides of the first intake duct pipeline 11, and splice the gas velocity distribution of the cross-section 14 to be measured on both sides of the first intake duct pipeline 11 to obtain the two-dimensional gas velocity data at the outlet of the intake duct 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 intake duct pipeline 17 .

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

[0060] It should be noted that when the PIV test is performed using the particle image velocimetry component, the first intake duct pipeline 11 is connected to the outlet of the intake duct model test piece 7 , and when the probe test is performed using the probe measurement component, the second intake duct pipeline 17 is connected to the outlet of the intake duct 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 communicated with the data processing module. The outlet boundary layer probe, the pressure scanning valve and the atmospheric pressure sensor are all arranged on the second intake duct pipeline 17.

[0062] The inlet total pressure probe is arranged at the inlet of the inlet duct model test piece 7, and is used to transmit the gas pressure at the inlet of the inlet duct model test piece 7 to the pressure scanning valve; a plurality of probe displacement mechanisms 16 are evenly arranged along the circumference of the second inlet pipeline, and each probe displacement mechanism 16 is provided with an outlet five-hole probe 15, and the outlet five-hole probe 15 is used to transmit the pressure of the gas inside the second inlet pipeline 17 to the pressure scanning valve. The probe displacement mechanism 16 is used to adjust the position of the outlet five-hole probe 15, and the outlet five-hole probe 15 obtains the pressure at different positions inside the second inlet pipeline 17. It should be noted that the outlet five-hole probe 15 and the outlet boundary layer probe are replaceable.

[0063] The outlet boundary layer probe is used to transmit the gas pressure near the wall of the second inlet duct 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 duct model test piece 7, the pressure at different positions inside the second intake duct pipeline 17, and the gas pressure near the pipe wall of the second intake duct pipeline 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 intake duct model test piece 7, as well as the distribution of circumferential gas flow field parameters at the outlet of the intake duct model test piece 7 based on the gas pressure at the inlet of the intake duct model test piece 7, the pressures at different positions inside the second intake duct pipeline 17, the gas pressure near the pipe wall of the second intake duct pipeline 17, and the atmospheric pressure value.

[0066] Based on the above-mentioned visualization test system for the inlet duct of a heavy-duty gas turbine, an embodiment of the present invention further provides a visualization test method for the inlet duct of a heavy-duty gas turbine, comprising the following steps:

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

[0068] S2, performing a PIV test by using a particle image velocity measurement component to obtain two-dimensional velocity data of the gas at the outlet of the inlet duct 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 section 14 to be measured of the first air inlet duct 11, adjust the position of the camera 10 so that the camera 10 faces the outlet of the first air inlet duct 11, and adjust the focal length of the camera 10 so that the focal plane of the camera 10 coincides with the section 14 to be measured.

[0070] S22, start the laser sheet light source 9, the synchronizer and the camera 10, and control the laser sheet light source 9 to trigger and the camera 10 to expose synchronously through the synchronizer, such as Figure 3 As shown, a cross-section photo A18 to be measured on one side of the first air intake pipe 11 is obtained by the 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 inlet duct 11, so that the laser plane emitted by the laser sheet light source 9 coincides with the position of the section 14 to be measured of the first air inlet duct 11, and the triggering of the laser sheet light source 9 and the exposure of the camera 10 are controlled by a synchronizer to be synchronized, and a photo B19 of the section to be measured on the other side of the first air inlet duct 11 is obtained by the camera 10.

[0072] S24, determining the two-dimensional velocity data of the gas at the outlet of the inlet duct model test piece 7 according to the cross-sectional photo A18 and the cross-sectional photo B19, comprising the following steps:

[0073] The data analysis module analyzes the cross-section photo A18 to be measured on one side of the first air intake duct 11 obtained from the camera 10 to obtain the gas velocity distribution of the cross-section 14 to be measured on one side of the first air intake duct 11 .

[0074] The data analysis module analyzes the cross-section photo B19 to be measured on the other side of the first air intake duct 11 obtained from the camera 10 to obtain the gas velocity distribution of the cross-section 14 to be measured on the other side of the first air intake duct 11 .

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

[0076] S3, performing a probe test by using a probe measuring component, determining the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece 7 according to the obtained gas velocity information and pressure information at different circumferential positions of the outlet of the inlet duct model test piece 7, verifying the PIV test results by using the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece 7, and supplementing the flow field parameters of the near-wall area of ​​the outlet of the inlet duct model test piece 7, including the following steps:

[0077] S31. Replace the first intake duct pipeline 11 at the outlet of the intake duct model test piece 7 with the second intake duct pipeline 17, install an inlet total pressure probe at the inlet of the intake duct 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 duct pipeline 17, install an outlet five-hole probe 15 on the probe displacement mechanism 16, and 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 fan and the inlet fan 1, monitor the gas flow at the outlet of the inlet duct model test piece 7 through the flow meter 6, and adjust the power of the outlet high-pressure main fan and the inlet fan 1 through the fan control cabinet 3 so that the gas flow at the outlet of the inlet duct model test piece 7 reaches the set value (the flow required for the experiment).

[0079] S33, the inlet total pressure probe transmits the gas pressure at the inlet of the intake duct model test piece 7 to the pressure scanning valve; the outlet five-hole probe 15 transmits the pressure of the gas inside the second intake duct pipeline 17 to the pressure scanning valve; the outlet boundary layer probe transmits the gas pressure near the pipe wall of the second intake duct pipeline 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.

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

[0081] S35 , changing the position of the outlet five-hole probe 15 through the probe displacement mechanism 16 , repeating steps S32 - S34 , and obtaining the gas velocity information and pressure information at different circumferential positions of the outlet of the inlet duct model test piece 7 .

[0082] S36. Determine the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece 7 based on the gas velocity information and pressure information at different circumferential positions of the outlet of the inlet duct model test piece 7, verify the PIV test results through the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece 7, and supplement the flow field parameters of the near-wall area of ​​the outlet of the inlet duct model test piece 7.

[0083] The embodiment of the present invention can effectively carry out the test bench design for tracer particle dispersion, PIV optical test and probe test, and can obtain the flow characteristics of the inlet outlet.

[0084] The embodiment of the present invention forms detailed flow field information of the inlet outlet that can be obtained by using the PIV technology for subsequent analysis and design.

[0085] The visualization test system of the embodiment of the present invention ensures the accuracy of the PIV test by providing a pressure stabilizing chamber 2 in the gas path, a cube window 12 in the light path, and an inner cone shading treatment on the inlet duct model test piece 7, thereby obtaining reliable test results.

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

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

Claims

1. A visual test system for a heavy-duty gas turbine inlet, characterized in that: It comprises an inlet fan (1), a pressure stabilizing chamber (2), an outlet fan (5), a flow meter (6), a particle image velocity measurement component, a probe measurement component and an air inlet duct model test piece (7); The outlet of the inlet fan (1) is connected to the inlet of the air inlet 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 air inlet model test piece (7), the outlet of the air inlet model test piece (7) is connected to the inlet of the outlet fan (5) through a pipeline component (4), and the flow meter (6) is arranged on the pipeline component (4); The particle image velocimetry component is used to obtain two-dimensional velocity data of the gas at the outlet of the inlet duct 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 duct model test piece (7) based on the gas velocity information and pressure information obtained at different circumferential positions of the outlet of the inlet duct model test piece (7).

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

3. The visualization test system for the inlet duct of a heavy-duty gas turbine according to claim 1, characterized in that: The particle image velocity measurement component comprises a particle generator (8), a laser sheet light source (9), a camera (10) and a synchronizer, and the pipeline component (4) comprises a first air inlet pipeline (11); The outlet of the particle generator (8) is connected to the inlet of the inlet fan (1), the position of the laser sheet light source (9) is configured to switch between the two sides of the first air inlet pipeline (11), one end of the first air inlet pipeline (11) is configured to be connected to the outlet of the air inlet model test piece (7), and the other end of the first air inlet pipeline (11) is configured to be connected to the inlet of the outlet fan (5), the synchronizer is connected to the laser sheet light source (9) and the camera (10), and the camera (10) is arranged downstream of the first air inlet pipeline (11).

4. The visualization test system for the inlet duct of a heavy-duty gas turbine according to claim 3, characterized in that: The pipeline component (4) further comprises a cube-shaped window (12), wherein the cube-shaped window (12) is arranged between the outlet of the first air inlet pipeline (11) and the inlet of the outlet fan (5).

5. The visualization test system for the inlet duct of a heavy-duty gas turbine according to claim 1, characterized in that: The probe measurement component comprises 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, and the pipeline component (4) comprises a second air inlet pipeline (17); One end of the second air intake duct pipeline (17) is configured to be connected to the outlet of the air intake duct model test piece (7), and the other end of the second air intake duct pipeline (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 the pipeline. The outlet boundary layer probe, the pressure scanning valve and the atmospheric pressure sensor are all arranged on the second air intake duct pipeline (17). The inlet total pressure probe is arranged at the inlet of the air intake duct model test piece (7). A plurality of probe displacement mechanisms (16) are arranged along the circumference of the second air intake duct (17), and each of the probe displacement mechanisms (16) is provided with one of the outlet five-hole probes (15).

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

7. The visualization test system for the inlet duct of a heavy-duty gas turbine according to claim 3, characterized in that: The first air intake pipe (11) is made of organic glass.

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

9. A visualization test method for a heavy-duty gas turbine inlet, characterized in that: The visualization test system for the inlet duct of a heavy-duty gas turbine according to any one of claims 1 to 8 is implemented, comprising the following steps: Starting the outlet high-pressure main fan and the inlet fan (1), monitoring the gas flow rate at the outlet of the inlet duct model test piece (7) through the flow meter (6), and adjusting the power of the outlet high-pressure main fan and the inlet fan (1) so that the gas flow rate at the outlet of the inlet duct model test piece (7) reaches a set value; Performing a PIV test by using a particle image velocimetry component to obtain two-dimensional velocity data of gas at the outlet of an inlet duct model test piece (7); A probe test is performed using a probe measuring component, and the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece (7) is determined based on the gas velocity information and pressure information obtained at different circumferential positions of the outlet of the inlet duct model test piece (7). The PIV test results are checked using the circumferential gas flow field parameter distribution at the outlet of the inlet duct model test piece (7), and the flow field parameters of the near-wall area of ​​the outlet of the inlet duct model test piece (7) are supplemented.

10. The visualization test method for the inlet duct of a heavy-duty gas turbine according to claim 9, characterized in that: The method comprises the following steps: performing a PIV test by using a particle image velocity measurement component to obtain two-dimensional velocity data of gas at the outlet of an inlet duct model test piece (7): Starting the particle generator (8), adjusting 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 section to be measured (14) of the first air inlet pipe (11), and adjusting the focal length of the camera (10) so that the focal plane of the camera (10) coincides with the section to be measured (14); The laser sheet light source (9) is triggered and the camera (10) is exposed synchronously by controlling the synchronizer, and a cross-sectional photograph A (18) to be measured on one side of the first air inlet pipe (11) is obtained by the camera (10); The laser sheet light source (9) is changed to the other side of the first air inlet pipe (11), so that the laser plane emitted by the laser sheet light source (9) coincides with the position of the section to be measured (14) of the first air inlet pipe (11), and the triggering of the laser sheet light source (9) and the exposure of the camera (10) are controlled synchronously by a synchronizer, and a photograph B (19) of the section to be measured on the other side of the first air inlet pipe (11) is obtained by the camera (10); According to the cross-sectional photograph A (18) and the cross-sectional photograph B (19) to be measured, the two-dimensional velocity data of the gas at the outlet of the inlet duct model test piece (7) is determined.

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