Flow field speed measuring device and speed measuring method for rotor passage of impeller machinery

Abstract

The present invention provides a flow field speed measuring device and a speed measuring method for a rotor channel of an impeller machine, and relates to the technical field of fluid mechanics. The flow field speed measuring device comprises: a laser, which is suitable for generating a first line of laser; a casing, a tracer particle flow field is formed inside the casing, and a rotatable rotor is provided in the tracer particle flow field; a transparent window, which is arranged on the window of the casing; a sheet light source forming component, which is suitable for reflecting the first line of laser into the inside of the casing and forming a plurality of sheet light sources that can move along the radial direction of the rotor; a camera component, which is suitable for photographing tracer particles in the tracer particle flow field through the transparent window based on a plurality of sheet light sources at different radial positions, and obtaining a plurality of frames of particle images corresponding to different radial positions; and a processor, which is suitable for obtaining the flow field speed of the rotor channel based on the plurality of frames of particle images.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid mechanics, and more specifically, to a flow field speed measuring device and a speed measuring method for a rotor channel of an impeller machine. Background Art

[0002] There are various complex internal flows such as vortex systems in the rotor channel of the impeller machinery. The measurement of the internal flow of the mechanical rotor using measurement technologies such as dynamic sensors can only obtain the dynamic static pressure at the wall position of the casing, and cannot obtain the flow data at different radial positions of the rotor. Therefore, non-contact particle image velocimetry technology has attracted attention. However, particle image velocimetry technology based on planar two-dimensional images can only obtain the two-dimensional velocity distribution on a certain cross section in the radial direction of the rotor. In the case of the complexity of three-dimensional flow inside the rotor channel of the machine, the three velocity components on a certain cross section can be obtained using volumetric particle image velocimetry technology. When using volumetric particle image velocimetry technology to measure the flow field inside the channel, it is necessary to generate a light sheet to illuminate the tracer particle group in the tracer particle flow field inside the rotor channel, so as to obtain particle images at different times.

[0003] In the related art, a line laser on the outside of the casing is introduced into the inside of the casing through a light guide arm to generate a sheet light source. However, due to the large diameter of the light guide arm, it will have a greater impact on the flow field. In order to reduce this impact, the light guide arm will not be extended too far into the casing, which in turn limits the measurement range of the flow field in the radial direction of the rotor.

[0004] In the related art, a light sheet is directly generated on the outside of the casing by using a casing and a rotor made of organic plastic. However, an engine using a casing and a rotor made of organic plastic requires a special working solution, which cannot meet the needs of an actual engine, limiting the acquisition of experimental data under real intake conditions. Summary of the invention

[0005] In view of this, the present invention provides a flow field speed measuring device and a speed measuring method for a rotor channel of an impeller machinery, which can more conveniently measure the flow field at different radial positions.

[0006] One aspect of the present invention provides a flow field velocity measuring device for a rotor channel of an impeller machine, the flow field velocity measuring device comprising: a laser 1, adapted to generate a first line laser; a casing 5, wherein a tracer particle flow field is formed inside the casing, and a rotatable rotor is provided in the tracer particle flow field; a transparent window 6, arranged on the window of the casing 5; a sheet light source forming component, adapted to reflect the first line laser into the casing 5, and to form a plurality of sheet light sources that can move along the radial direction of the rotor; wherein the sheet light source forming component comprises: a first mechanism 2, arranged on the outer side of the casing 5, adapted to receive the first line laser, and adjust the output angle of the first line laser to generate a second line laser; a second mechanism 3, installed on the casing 5; a plurality of sheet light sources that can move along the radial direction of the rotor; wherein the ... The first position of the above-mentioned casing 5 is suitable for receiving and reflecting the above-mentioned second line laser to output a third line laser; and the third mechanism 4 is installed at the second position of the above-mentioned casing 5, and is suitable for receiving and reflecting the above-mentioned third line laser to form the above-mentioned light sheet that can move along the above-mentioned radial direction; wherein the above-mentioned first position and the above-mentioned second position are located at different positions on the above-mentioned casing 5 close to the above-mentioned transparent window 6; the camera component 7 is suitable for photographing the tracer particles in the above-mentioned tracer particle flow field through the above-mentioned transparent window 6 based on the multiple above-mentioned light sheets at different radial positions, so as to obtain multiple frames of particle images corresponding to the above-mentioned different radial positions; and the processor is suitable for obtaining the rotor channel flow field velocity based on the above-mentioned multiple frames of particle images.

[0007] According to an embodiment of the present invention, the first mechanism 2 includes: an adjustment unit, suitable for realizing movement with multiple degrees of freedom; and a prism 23, mounted on the adjustment unit; wherein, in the process of driving the prism 23 to realize the movement with multiple degrees of freedom through the adjustment unit, the output angle of the first line laser is adjusted by utilizing the reflection of the first line laser by the prism 23.

[0008] According to an embodiment of the present invention, the second mechanism 3 includes: a first base 33, installed at the first position, a first portion of the first base 33 is located outside the casing 5, and a second portion of the first base 33 is embedded in the casing 5; a second base 32, installed on the first portion of the first base 33; a lens 31, installed on the second base 32; and a reflector 34, installed on the second portion of the first base 33; wherein the second line laser passes through the lens 31, is incident on the reflector 34 and is reflected, and outputs the third line laser.

[0009] According to an embodiment of the present invention, the third mechanism 4 includes: a clamping frame 41, which is installed at the second position and located on the outside of the casing 5; the clamping frame 41 is provided with a first through hole; an adjusting arm 42, one end of which is provided with a supporting surface 422, the adjusting arm 42 passes through the first through hole and the supporting surface 422 extends into the inner side of the casing 5; and a cylindrical mirror 43, which is fixed on the supporting surface 422 and is suitable for receiving the third line laser to form the light sheet; wherein, in the process of driving the cylindrical mirror 43 to move along the radial direction by the supporting surface 422, the cylindrical mirror 43 is used to reflect the third line laser and form the light sheet, thereby realizing the movement of the light sheet along the radial direction.

[0010] According to an embodiment of the present invention, the above-mentioned adjustment unit includes: a first adjustment subunit 21, which is suitable for moving the position of the above-mentioned prism 23 along a first direction, and is also suitable for rotating the above-mentioned prism 23 around a second direction; and a second adjustment subunit 22, which is installed on the above-mentioned first adjustment subunit 21 and is suitable for rotating the above-mentioned prism 23 around a third direction.

[0011] According to an embodiment of the present invention, the above-mentioned casing 5 is provided with a second through hole at the above-mentioned first position, so that the above-mentioned second mechanism 3 can receive the above-mentioned second line laser through the above-mentioned second through hole; the above-mentioned casing 5 is provided with a third through hole at the above-mentioned second position, so that the above-mentioned third mechanism 4 can adjust the radial position of the above-mentioned light source sheet through the above-mentioned third through hole.

[0012] According to an embodiment of the present invention, the second base 32 is provided with a cavity so that the second line laser passes through the cavity and enters the interior of the casing 5; the first base 33 is provided with a trapezoidal slope so that the reflector 34 can be fixed through the trapezoidal slope.

[0013] According to an embodiment of the present invention, the transparent window 6 includes: a transparent plate 61 installed at the window position on the casing 5; and two pressing blocks installed at both ends of the window on the casing 5, so that the transparent plate 61 cooperates with the window on the casing 5 to seal the flow field airflow.

[0014] According to an embodiment of the present invention, the camera assembly 7 includes: an assembly 73, suitable for adjusting the radial position of the camera assembly 7; a support plate 72, mounted on the assembly 73, on which a plurality of positioning holes are provided; and a camera 71, mounted on the support plate 72, configured to connect different groups of positioning holes of the support plate 72 to adjust the field of view of the camera 71.

[0015] Another aspect of the present invention provides a speed measurement method based on the flow field speed measurement device of the rotor channel of the impeller machinery.

[0016] According to an embodiment of the present invention, a plurality of sheet light sources that can move along the radial direction of the rotor are formed on the inner side of the casing by forming an assembly through a laser and a sheet light source. The flow field at different radial positions can be measured through a transparent window and a camera assembly. The output angle of the first line laser is flexibly adjusted by the first mechanism, the integrated design of the second mechanism and the casing, and the radially adjustable design of the third mechanism, so that the second line laser can enter the interior of the casing and form a sheet light source that can move along the radial direction inside the casing. The interference of the airflow in the flow field is reduced, and the full range measurement of the flow field in the radial direction of the rotor can be achieved. It also avoids the need to replace the materials of the casing and the rotor for ease of measurement, and experimental data at different radial positions under real intake conditions can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of a light-guiding wall of a particle image velocimetry technique for a mechanical rotor channel in the related art is shown.

[0019] Figure 2 A schematic diagram of a casing and a rotor made of transparent organic plastic in the related art is shown.

[0020] Figure 3 A schematic structural diagram of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0021] Figure 4 A schematic structural diagram of a first mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0022] Figure 5 A schematic structural diagram of a first regulating subunit of a flow field speed measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0023] Figure 6 A schematic structural diagram of a second regulating subunit of a flow field speed measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0024] Figure 7 A schematic diagram of a prism of a flow field velocity measuring device of a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0025] Figure 8 A schematic structural diagram of a second mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0026] Fig. 9A schematic diagram of a lens of a flow field velocity measuring device of a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0027] Fig.10 A cross-sectional schematic diagram of a second base of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0028] Fig.11 A cross-sectional schematic diagram of a first base of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0029] Fig.12 A schematic diagram of a reflector of a flow field velocity measuring device of a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0030] Fig.13 A schematic structural diagram of a third mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0031] Fig.14 A schematic diagram of a clamping frame of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0032] Fig.15 A schematic diagram of an adjusting arm of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0033] Fig.16 A schematic diagram of a cylindrical mirror of a flow field velocity measuring device of a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0034] Fig.17 A schematic diagram of a casing of a device for measuring flow field velocity in a rotor passage of a turbomachinery according to an embodiment of the present invention is shown.

[0035] Fig.18 A schematic diagram of a transparent plate of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0036] Fig.19 A schematic diagram of a pressing block of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0037] Fig. 20 A schematic diagram of a camera assembly of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0038] Fig.21 A schematic diagram of a support plate of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0039] Description of reference numerals:

[0040] 1: Laser;

[0041] 2: First institution;

[0042] 21: first regulatory subunit;

[0043] 211: The third component;

[0044] 212: The fourth component;

[0045] 213: Fifth component;

[0046] 22: second regulatory subunit;

[0047] 221: Second component;

[0048] 222: first component;

[0049] 23: Prism;

[0050] 231: Page 1;

[0051] 3: Second institution;

[0052] 31: Lens;

[0053] 32: Second base;

[0054] 321: Side 2;

[0055] 322: fourth through hole;

[0056] 323: Side 3;

[0057] 33: First base;

[0058] 331: Trapezoidal slope;

[0059] 332: fifth through hole;

[0060] 333: Part I;

[0061] 334: Part II;

[0062] 34: reflector;

[0063] 341: Side 4;

[0064] 4: Third institution;

[0065] 41: Clamping frame;

[0066] 411: seventh through hole;

[0067] 412: first through hole;

[0068] 413: threaded hole;

[0069] 42: Adjustment arm;

[0070] 421: Second subject;

[0071] 422: Support surface;

[0072] 423: Adjustment threaded hole;

[0073] 43: Cylindrical mirror;

[0074] 431: First subject;

[0075] 432: cylindrical surface;

[0076] 433: Side 5;

[0077] 5: Receiver;

[0078] 51: window;

[0079] 52: second threaded blind hole;

[0080] 531: second through hole;

[0081] 532: sixth through hole;

[0082] 541: third through hole;

[0083] 542: first threaded blind hole;

[0084] 6: Transparent window;

[0085] 61: Transparent plate;

[0086] 611: female stop mouth;

[0087] 62: Briquetting;

[0088] 621: eighth through hole;

[0089] 622: Boss;

[0090] 7: Camera assembly;

[0091] 71: Camera;

[0092] 72: support plate;

[0093] 721: ninth through hole;

[0094] 722: tenth through hole;

[0095] 73: Components;

[0096] X: first direction;

[0097] V: second direction;

[0098] H: third direction; DETAILED DESCRIPTION

[0099] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0100] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0101] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0102] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0103] Figure 1 A schematic diagram of a light-guiding wall of a particle image velocimetry technique for a mechanical rotor channel in the related art is shown.

[0104] In related technologies, such as Figure 1 As shown in the figure, when lighting is applied at the inlet of the mechanical rotor, the installation angle of the rotor blades will block the light sheet, and the flow field data of the entire mechanical rotor channel cannot be obtained. The line laser generated by the external laser can be introduced into the inner side of the casing through the light guide wall to generate a light sheet. Since the diameter of the light guide arm is relatively large, usually around 20 mm, it will have a significant impact on the flow field whether it is arranged upstream or downstream of the rotor blade top. Figure 1 As shown, in order to minimize the interference to the flow field, the light guide arm needs to be extended a very short distance into the inner side of the casing to measure a fixed position at a very high radial position of the blade. It is impossible to adjust the radial movement of the light guide arm along the blade, thus limiting the acquisition of flow field data at different radial positions of the blade.

[0105] Figure 2 A schematic diagram of a casing and a rotor made of transparent organic plastic in the related art is shown.

[0106] In related technologies, such as Figure 2 As shown in the figure, the casing and the rotor are made of transparent organic plastic (such as acrylic plate), and the engine working fluid is changed to a special working solution. The optical refractive index of the working solution is matched with the casing and the rotor by adjusting the concentration, temperature, pressure and other parameters of the working solution. Therefore, a light sheet can be directly generated outside the engine to illuminate the rotor channel flow field. However, due to its special working solution and organic plastic material, the engine speed is limited to several hundred revolutions. Once the speed is increased, the cavitation phenomenon of the working solution is serious, and the strength is limited, which cannot meet the requirements of high speed and high load of the actual engine, thus limiting the acquisition of experimental data under real intake conditions.

[0107] In summary, the technical problems in related technologies are mainly as follows: the light guide arm is large in size, which will interfere with the flow field and airflow, and will also affect the measurement range in the radial direction of the rotor; the fully transparent casing and rotor cannot meet the needs of the engine, limiting the acquisition of experimental data under real intake conditions.

[0108] The present invention provides a flow field speed measuring device and a speed measuring method for a rotor channel of an impeller machine, in order to solve at least one of the above technical problems.

[0109] Figure 3 A schematic structural diagram of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0110] like Figure 3 As shown, the flow field velocity measuring device of the rotor channel of the impeller machinery includes a laser 1, a casing 5, a transparent window 6, a sheet light source forming component, a camera component 7 and a processor.

[0111] According to an embodiment of the present invention, the laser 1 is suitable for generating a first line of laser light. A tracer particle flow field is formed inside the casing 5, and a rotatable rotor is provided in the tracer particle flow field. A transparent window 6 is arranged on the window of the casing 5. The sheet light source forming component is suitable for reflecting the first line of laser light into the inside of the casing 5, and forming a plurality of sheet light sources that can move along the radial direction of the rotor. The camera component 7 is suitable for photographing the tracer particles in the tracer particle flow field through the transparent window 6 based on a plurality of sheet light sources at different radial positions, and obtaining a plurality of frames of particle images corresponding to different radial positions. The processor is suitable for obtaining the rotor channel flow field velocity based on the plurality of frame particle images.

[0112] According to an embodiment of the present invention, the flow area between different rotor blades of the impeller machine is called a mechanical rotor channel, and the gas flows along the mechanical rotor channel to form a flow field. The particle image velocimetry method scatters some tracer particles with good tracking and reflective properties in the flow field, uses a laser sheet light source to illuminate the cross-sectional area of ​​the flow field, continuously captures particle images of the tracer particles exposed multiple times through a camera module, and uses an image cross-correlation method to analyze the particle images, so as to obtain the average displacement of the particle image in each query area, thereby determining the motion data of the cross-sectional area.

[0113] According to an embodiment of the present invention, the light sheet may illuminate the tip region of the rotor blade to obtain motion data of a cross-sectional region of the flow field.

[0114] In one example, the tip region of the blade mainly includes the position between 80% relative height position of the blade and the wall surface of the casing 5. For example, 80% relative blade height, 89% relative blade height, 90% relative blade height, and blade tip clearance.

[0115] like Figure 3 As shown, the light source sheet forming assembly includes a first mechanism 2 , a second mechanism 3 and a third mechanism 4 .

[0116] According to an embodiment of the present invention, the first mechanism 2 is arranged outside the casing 5, and is suitable for receiving the first line laser, and adjusting the output angle of the first line laser to generate the second line laser. The second mechanism 3 is installed at the first position of the casing 5, and is suitable for receiving and reflecting the second line laser to output the third line laser. The third mechanism 4 is installed at the second position of the casing 5, and is suitable for receiving and reflecting the third line laser to form a light sheet that can move along the radial direction.

[0117] According to an embodiment of the present invention, the first position and the second position are located at different positions on the casing 5 close to the transparent window 6 .

[0118] In one example, the first position is at an edge of the casing 5 adjacent to an upper end of the transparent window 6 , and the second position is at an edge of the casing 5 adjacent to a lower end of the transparent window 6 .

[0119] According to an embodiment of the present invention, a plurality of sheet light sources that can move along the radial direction of the rotor are formed on the inner side of the casing by forming an assembly through a laser and a sheet light source. The flow field at different radial positions can be measured through a transparent window and a camera assembly. The output angle of the first line laser is flexibly adjusted by the first mechanism, the integrated design of the second mechanism and the casing, and the radially adjustable design of the third mechanism, so that the second line laser can enter the interior of the casing and form a sheet light source that can move along the radial direction inside the casing. The interference of the airflow in the flow field is reduced, and the full range measurement of the flow field in the radial direction of the rotor can be achieved. It also avoids the need to replace the materials of the casing and the rotor for ease of measurement, and experimental data at different radial positions under real intake conditions can be obtained.

[0120] Figure 4 A schematic structural diagram of a first mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0121] like Figure 4 As shown, the first mechanism 2 includes an adjustment unit and a prism 23 .

[0122] According to an embodiment of the present invention, the adjustment unit is suitable for realizing multiple degrees of freedom of movement. The prism 23 is mounted on the adjustment unit. In the process of driving the prism 23 to realize multiple degrees of freedom of movement by the adjustment unit, the output angle of the first line of laser light is adjusted by utilizing the reflection of the first line of laser light by the prism 23.

[0123] According to an embodiment of the present invention, the adjustment unit makes the adjustment of the output angle of the first line laser more flexible, forming a mechanism for adjusting the first line laser with multiple degrees of freedom, and can precisely adjust the position of the second line laser incident on the second mechanism, and can successfully reflect the second line laser. Further, the position of the third line laser incident on the third mechanism can be precisely adjusted. By adjusting the output angle of the first line laser, combined with the radial movement of the adjustment arm of the third mechanism, the position of the sheet light source can be accurately adjusted.

[0124] like Figure 4 As shown, the regulating unit includes a first regulating subunit 21 and a second regulating subunit 22 .

[0125] According to an embodiment of the present invention, the first adjusting subunit 21 is adapted to move the position of the prism 23 along the first direction X, and is also adapted to rotate the prism 23 around the second direction V. The second adjusting subunit 22, mounted on the first adjusting subunit 21, is adapted to rotate the prism 23 around the third direction H.

[0126] Figure 5 A schematic structural diagram of a first regulating subunit of a flow field speed measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0127] Figure 6 A schematic structural diagram of a second regulating subunit of a flow field speed measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0128] Figure 7 A schematic diagram of a prism of a flow field velocity measuring device of a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0129] In one example, if Figure 5 , Figure 6 and Figure 7 As shown, the prism 23 may be a silver-plated triangular prism in the shape of a triangular prism, and the first surface 231 of the prism 23 with silver plating on the surface is used to reflect the first line of laser. The first component 222 of the second adjusting subunit 22 can fix the prism 23 by sticking to the other surfaces of the prism 23. The first component 222 of the second adjusting subunit 22 cooperates with the second component 221 through a bearing to realize the rotation of the prism 23 around the third direction H. The fourth component 221 of the second adjusting subunit 22 is connected to the third component 213 of the first adjusting subunit 21, and the connection method may be bolt connection. The first adjusting subunit 21 includes a third component 211, a fourth component 212 and a fifth component 213. The third component 211 is provided with a slide rail, and the fourth component 212 is provided with a matching groove that cooperates with the slide rail to realize the function of moving the prism 23 along the first direction X. The fifth component 213 cooperates with the fourth component 212 through a bearing to realize the function of rotating the prism 23 around the second direction V.

[0130] According to an embodiment of the present invention, by adjusting the parallel movement of the prism in the first direction, the second line laser can smoothly enter the second mechanism and emit reflection. By adjusting the rotation of the prism around the second direction and the third direction, the output angle of the first line laser can be precisely adjusted, and then the position point where the second line laser is reflected in the second mechanism can be precisely adjusted.

[0131] Figure 8 A schematic structural diagram of a second mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0132] like Figure 8 As shown, the second mechanism 3 includes a first base 33 , a second base 32 , a lens 31 and a reflector 34 .

[0133] According to an embodiment of the present invention, the first base 33 is installed at a first position, the first part of the first base 33 is located outside the casing 5, and the second part of the first base 33 is embedded in the casing 5. The second base 32 is installed on the first part of the first base 33. The lens 31 is installed on the second base 32. The reflector 34 is installed on the second part of the first base 33. The second line laser passes through the lens 31, is incident on the reflector 34 and is reflected, and outputs a third line laser.

[0134] According to the embodiment of the present invention, the first base 32 is provided with a cavity so that the second line laser passes through the cavity and enters the interior of the casing 5. The second base 33 is provided with a trapezoidal inclined surface so as to fix the reflector 34 through the trapezoidal inclined surface.

[0135] Fig. 9 A schematic diagram of a lens of a flow field velocity measuring device of a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0136] Fig.10 A cross-sectional schematic diagram of a second base of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0137] Fig.11 A cross-sectional schematic diagram of a first base of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0138] Fig.12 A schematic diagram of a reflector of a flow field velocity measuring device of a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0139] In one example, if Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, the lens 31 can be a flat rectangular high lens. The lens 31 is fixed to the second surface 321 of the second base 32 by gluing. The other side opposite to the third surface 323 of the second base 32 is connected to the first part 333 of the first base 33. The second part 334 of the first base 33 is embedded in the casing 5. The reflector 34 can be a flat rectangular silver-plated reflector, the fourth surface 341 of the reflector 34 is used to reflect the second line laser, and the other side symmetrical to the fourth surface 341 of the reflector 34 is connected to the trapezoidal inclined surface 331 of the second part 334 of the first base 33, and the reflector 34 is fixed by gluing.

[0140] In one example, the second base 32 is provided with a triangular cavity, and the first base 33 is provided with a trapezoidal cavity. The curvature radius of the lower end surface of the second portion 334 of the first base 33 is the same as the radius of the inner side of the casing 5.

[0141] According to the embodiment of the present invention, through the lens, the triangular cavity of the second base and the trapezoidal cavity of the first base, the second line laser can enter the second mechanism and be reflected on the reflector to output the third line laser. At the same time, the lens, the second base and the first base can also cooperate with the casing to form a sealed space to seal the flow field and airflow, forming a reflection mechanism integrated with the casing.

[0142] Fig.13 A schematic structural diagram of a third mechanism of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0143] like Fig.13 As shown, the third mechanism 4 includes a clamping frame 41 , an adjustment arm 42 and a cylindrical mirror 43 .

[0144] According to an embodiment of the present invention, the clamping frame 41 is installed at the second position and is located outside the casing 5. The clamping frame 41 is provided with a first through hole. One end of the adjusting arm 42 is provided with a supporting surface 422, the adjusting arm 42 passes through the first through hole and the supporting surface 422 extends into the inner side of the casing 5. The cylindrical mirror 43 is fixed on the supporting surface 422, and is suitable for receiving the third line laser to form a sheet light source. In the process of driving the cylindrical mirror 43 to move in the radial direction by the supporting surface 422, the cylindrical mirror 43 is used to reflect the third line laser and form a sheet light source, so as to realize the movement of the sheet light source in the radial direction.

[0145] Fig.14 A schematic diagram of a clamping frame of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0146] Fig.15 A schematic diagram of an adjusting arm of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0147] Fig.16 A schematic diagram of a cylindrical mirror of a flow field velocity measuring device of a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0148] In one example, if Fig.14 , Fig.15 and Fig.16 As shown, the first body 431 of the cylindrical mirror 43 is provided with a cylindrical surface 432, which may be a silver-plated surface, for reflecting the third line laser and forming a light sheet. The fifth surface 433 of the cylindrical mirror 43 opposite to the cylindrical surface 432 is connected to the support surface 422 of the adjustment arm 42, which may be an inclined surface, and the cylindrical mirror 43 may be fixed on the support surface 422 of the adjustment arm 42 by gluing. The adjustment arm 42 passes through the first through hole 412 of the clamping frame 41 to realize the movement of the light sheet along the radial direction.

[0149] In one example, the second body 421 of the adjustment arm 42 may be in the shape of a rod. The clamping frame 41 is provided with a threaded hole 413 on the side, and after the radial position of the light sheet is determined, the adjustment arm 42 may be fastened by engaging the top screw with the threaded hole 413 to define the radial position of the light sheet at this moment, and the adjustment arm 42 may be adjusted to move in the radial direction and rotate along its own axis.

[0150] In one example, if Fig.15 As shown, there is a gap between the second body 421 of the adjustment arm 42 and the support surface 422, and the gap is provided with an adjustment threaded hole 423. In the process of adjusting and installing the third mechanism 4, the top screw can be matched with the adjustment threaded hole 423 to adjust the inclination angle of the axis of the support surface 422 and the second body 421, so that the plane where the light source sheet is located is perpendicular to the radial direction.

[0151] In one example, the pasting of the cylindrical mirror 43 and the support surface 422 and the adjustment of the inclination angle between the support surface 422 and the axis of the second body 421 are all performed on the outside of the casing 5. The maximum dimension of the cylindrical mirror 43 along the radial direction after pasting should be smaller than the diameter of the second body 421 of the adjustment arm 42, so that the pasted cylindrical mirror 43 and the adjustment arm 42 can pass through the first through hole 412.

[0152] Fig.17 A schematic diagram of a casing of a device for measuring flow field velocity in a rotor passage of a turbomachinery according to an embodiment of the present invention is shown.

[0153] like Fig.17 As shown, the casing 5 is provided with a second through hole 531 at the first position so that the second mechanism 3 can receive the second line laser through the second through hole 531. The casing 5 is provided with a third through hole 541 at the second position so that the third mechanism 4 can move the light sheet through the third through hole 541.

[0154] In one example, the first through hole 531 can be an arc-shaped groove through hole, and the second portion 334 of the first base 33 is embedded in the second through hole 531 of the receiver 5. The first through hole 412 of the clamping frame 41 cooperates with the third through hole 541 of the receiver 5, so that the end of the adjustment arm 42 with the support surface 422 can extend into the inner side of the receiver 5.

[0155] In one example, the two fourth through holes 322 of the second base 32, the two fifth through holes 332 of the first base 33 and the two sixth through holes 532 of the first position of the casing 5 are matched by bolts. The clamping frame 41 is also provided with two seventh through holes 411 which are matched with the two first threaded blind holes 542 of the second position of the casing 5 by bolts.

[0156] According to an embodiment of the present invention, the transparent window 6 includes a transparent plate 61 and two pressing blocks. The transparent plate 61 is installed at the window position on the casing 5. The two pressing blocks are installed at both ends of the window on the casing 5, so that the transparent plate 61 cooperates with the window on the casing 5 to seal the flow field airflow.

[0157] Fig.18 A schematic diagram of a transparent plate of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0158] Fig.19 A schematic diagram of a pressing block of a flow field velocity measuring device for a rotor channel of an impeller machine according to an embodiment of the present invention is shown.

[0159] In one example, if Fig.17 , Fig.18 and Fig.19 As shown, the casing 5 is provided with a window 51 with a circumferential range of 45°, and three equidistant second threaded blind holes 52 are arranged at both ends of the window 51 in the circumferential direction. A male stop is arranged on the inner side of the casing of the window 51. The transparent plate 61 can be a flat annular acrylic plate with a circumferential range of 45°, and the thickness can be 5mm±0.5mm. A female stop 611 is arranged around the transparent plate 61, and the male stop is tightly matched with the female stop 611; the two pressing blocks 62 are each provided with three eighth through holes 621, which are matched with the three equidistant second threaded blind holes 52 at both ends of the window 51 in the circumferential direction to tighten the cooperation between the transparent plate 61 and the window 51, so as to form a transparent window 6. The bosses 622 of the two pressing blocks 62 are connected to the transparent plate 61, and the curvature radius of the pressing end surface of the boss 622 is the same as the curvature radius of the transparent plate 61.

[0160] Fig. 20 A schematic diagram of a camera assembly of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0161] Fig.21 A schematic diagram of a support plate of a flow field velocity measuring device for a rotor channel of a turbomachinery according to an embodiment of the present invention is shown.

[0162] According to an embodiment of the present invention, the camera assembly 7 includes an assembly 73 , a support plate 72 and a camera 71 .

[0163] According to an embodiment of the present invention, the assembly 73 is adapted to adjust the radial position of the camera assembly 7. The support plate 72 is mounted on the assembly 73, and a plurality of positioning holes are provided on the support plate 72. The camera 71 is mounted on the support plate 72 and is configured to connect different groups of positioning holes of the support plate 72 to adjust the field of view of the camera 71.

[0164] In one example, if Fig. 20 and Fig.21As shown, the center of the support plate 72 is provided with multiple groups of four ninth through holes 721 in a square layout, which are used to connect the multi-degree-of-freedom adjustable component 73 similar to the first adjusting subunit 21. Multiple groups of tenth through holes 722 symmetrically located at the center are provided on both sides of the center of the support plate 72, and the multiple tenth through holes 722 serve as multiple groups of positioning holes for connecting the camera 71. The multiple tenth through holes 722 in each group are symmetrical to the center line and present a certain angle, for example, 30 degrees, for example, 60 degrees. The camera 71 may include a first camera and a second camera, and the angle between the first camera and the second camera may be set by connecting the multiple tenth through holes 722 in different groups of the support plate 72.

[0165] In one example, the support plate 72 is arranged obliquely along the installation angle direction of the blade tip.

[0166] In one example, the component 73 can adjust the radial position of the camera 71 along the radial direction of the impeller to measure the flow field of the rotor channel at different radial positions.

[0167] The present invention also provides a speed measuring method based on a flow field speed measuring device of a rotor channel of an impeller machine.

[0168] In one example, before starting the speed measurement work, a black matte tape may be pasted on the blades of the mechanical rotor to be measured to reduce the reflection on the surface of the rotor blades.

[0169] The main installation process of the flow field speed measuring device for the rotor channel of the impeller machinery is as follows: the rotor of the impeller machinery to be measured is pushed out of the casing 5, and the second mechanism 3, the third mechanism 4 and the transparent window 6 are sequentially installed on the casing 5. The positions of the laser 1, the camera assembly 7 and the first mechanism 2 are adjusted.

[0170] The process of forming a light sheet of the flow field speed measuring device of the rotor channel of the impeller machinery: turn on the laser 1. Through the adjustment of the first mechanism 2, the first line of laser emitted by the laser 1 is reflected, and the second line of laser is incident on the second mechanism 3. Through the movement or rotation of the adjustment arm 42 of the third mechanism 4, the cylindrical mirror 43 receives the third line of laser from the second mechanism 3 to form a light sheet. By adjusting the height of the laser 1, or adjusting the position of the second line of laser incident on the second mechanism 3 through the first mechanism 2, or adjusting the radial position of the adjustment arm 42 or the inclination angle of the support surface 422 through the third mechanism 4, or adjusting in coordination with each other, a light sheet can be formed at different radial positions.

[0171] The velocity measurement method of the flow field velocity measurement device of the rotor channel of the impeller machinery according to the present invention is as follows: based on the light sheet formed at different radial positions, the camera component 7 shoots the tracer particles in the tracer particle flow field to obtain multiple frames of particle images at different radial positions. The multiple frames of particle images are processed by the processor to obtain the flow field velocity of the rotor channel.

[0172] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A flow field velocity measuring device for a rotor channel of an impeller machine, characterized in that: The flow field velocity measuring device comprises: A laser (1) adapted to generate a first line of laser light; A casing (5), wherein a tracer particle flow field is formed inside the casing, and a rotatable rotor is provided in the tracer particle flow field; A transparent window (6) is arranged on the window of the casing (5); A light sheet forming component, adapted to reflect the first line laser into the interior of the casing (5) and form a plurality of light sheets that can move along the radial direction of the rotor; Wherein, the sheet light source forming component comprises: A first mechanism (2) is arranged outside the casing (5) and is adapted to receive the first line of laser light and adjust the output angle of the first line of laser light to generate a second line of laser light; A second mechanism (3) is installed at a first position of the casing (5) and is adapted to receive and reflect the second line of laser light to output a third line of laser light; and A third mechanism (4) is mounted at a second position of the casing (5), and is adapted to receive and reflect the third line laser to form the light sheet that can move along the radial direction; wherein the first position and the second position are located at different positions on the casing (5) close to the transparent window (6); A camera component (7) is adapted to photograph the tracer particles in the tracer particle flow field through the transparent window (6) based on the plurality of light sheets at different radial positions, so as to obtain a plurality of particle images corresponding to the different radial positions; and The processor is adapted to obtain the flow field velocity of the rotor channel based on the multiple frames of particle images.

2. The flow field velocity measuring device of the rotor channel of the impeller machinery according to claim 1, characterized in that: The first mechanism (2) comprises: an adjustment unit adapted to achieve movement with multiple degrees of freedom; and A prism (23) mounted on the adjustment unit; In the process of driving the prism (23) to achieve the movement of the multiple degrees of freedom by the adjustment unit, the output angle of the first line laser is adjusted by utilizing the reflection of the first line laser by the prism (23).

3. The flow field velocity measuring device for the rotor channel of the turbomachinery according to claim 1, characterized in that: The second mechanism (3) comprises: A first base (33) is installed at the first position, a first portion of the first base (33) is located outside the casing (5), and a second portion of the first base (33) is embedded in the casing (5); A second base (32) mounted on the first part of the first base (33); a lens (31) mounted on the second base (32); and A reflector (34) mounted on the second part of the first base (33); The second line of laser light passes through the lens (31), is incident on the reflector (34) and is reflected, and outputs the third line of laser light.

4. The device for measuring flow field velocity of a rotor channel of a turbomachinery according to claim 1, characterized in that: The third institution (4) comprises: A clamping frame (41) is installed at the second position and is located outside the casing (5); the clamping frame (41) is provided with a first through hole; an adjusting arm (42), wherein one end of the adjusting arm (42) is provided with a supporting surface (422), the adjusting arm (42) passes through the first through hole and the supporting surface (422) extends into the inner side of the casing (5); and A cylindrical mirror (43) fixed on the support surface (422) and adapted to receive the third line of laser light to form the light sheet; In the process of driving the cylindrical mirror (43) to move along the radial direction via the support surface (422), the cylindrical mirror (43) is utilized to reflect the third line laser and form the light source sheet, thereby achieving movement of the light source sheet along the radial direction.

5. The device for measuring flow field velocity of a rotor channel of a turbomachinery according to claim 2, characterized in that: The adjustment unit comprises: A first adjusting subunit (21), adapted to move the position of the prism (23) along a first direction, and also adapted to rotate the prism (23) around a second direction; and The second adjusting subunit (22) is mounted on the first adjusting subunit (21) and is suitable for rotating the prism (23) around a third direction.

6. The device for measuring flow field velocity of a rotor channel of a turbomachinery according to claim 1, characterized in that: The casing (5) is provided with a second through hole at the first position, so that the second mechanism (3) can receive the second line of laser through the second through hole; The casing (5) is provided with a third through hole at the second position, so that the third mechanism (4) can adjust the radial position of the light sheet through the third through hole.

7. The flow field velocity measuring device for the rotor channel of a turbomachinery according to claim 3, characterized in that: The second base (32) is provided with a cavity so that the second line laser can enter the interior of the casing (5) through the cavity; and the first base (33) is provided with a trapezoidal inclined surface so that the reflector (34) can be fixed via the trapezoidal inclined surface.

8. The device for measuring flow field velocity of a rotor channel of a turbomachinery according to claim 1, characterized in that: The transparent window (6) comprises: A transparent plate (61) mounted at the window position on the casing (5); and Two pressing blocks are installed at both ends of the window on the casing (5), so that the transparent plate (61) cooperates with the window on the casing (5) to seal the flow field airflow.

9. The device for measuring flow field velocity of a rotor channel of a turbomachinery according to claim 1, characterized in that: The camera assembly (7) comprises: An assembly (73) adapted to adjust the radial position of the camera assembly (7); A support plate (72) is mounted on the component (73), wherein the support plate (72) is provided with a plurality of groups of positioning holes; and The camera (71) is mounted on the support plate (72) and is configured to connect different groups of positioning holes of the support plate (72) to adjust the field of view of the camera (71).

10. A speed measurement method based on the flow field speed measurement device of the rotor channel of an impeller machine according to any one of claims 1 to 9.

Images