Light guide device for measuring flow field of gas compressor, measuring system and mounting method

Abstract

The invention discloses a light guide device for gas compressor flow field measurement, a measurement system and an installation method, and relates to the technical field of gas compressor flow field measurement. A first light guide plate, a second light guide plate, a third light guide plate and a fourth light guide plate of the light guide device are located at the axial position of a to-be-measured target area in a gas compressor, the first light guide plate and the second light guide plate are symmetrically distributed, and the third light guide plate and the fourth light guide plate are symmetrically distributed; the first light guide plate and the third light guide plate are used for making first laser emitted by the first laser generator enter a to-be-measured target area through the optical access window, and the second light guide plate and the fourth light guide plate are used for making second laser emitted by the second laser generator enter the to-be-measured target area through the optical access window. And the first laser and the second laser intersect in the to-be-measured target area. The catheter device can ensure that a laser measuring point can cover the whole to-be-measured target area, and the hidden danger of laser path distortion caused by large curvature of an optical access window can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor flow field measurement, and particularly to a light guiding device, a measurement system and an installation method for compressor flow field measurement. Background Art

[0002] Deeply understanding the internal flow characteristics of a compressor is extremely important for improving the compressor design ability. Experimental research is the most fundamental way to understand the internal flow characteristics of a compressor and master the flow mechanism. Fine flow field measurement can reveal the flow mechanism, evaluate the aerodynamic performance, and guide the optimization direction. At the same time, it also has important significance for verifying numerical simulations, correcting simulation algorithms, and improving design ideas. Modern compressor internal flow field measurement technologies are mainly divided into contact measurement and non-contact measurement. However, traditional contact measurement has defects such as low spatial resolution, serious blockage effect, and single measurement position, and can no longer meet the fine measurement requirements of the compressor internal flow field. Therefore, non-contact measurement of the compressor flow field has developed rapidly.

[0003] Non-contact measurement uses the emitted laser to irradiate the target area to be measured, and it has the characteristics of high measurement accuracy, wide application range, and no need for contact. The measurement system in the related technology uses a laser generator as the light source, and an optical access window is opened on the casing wall. The laser emitted by the laser generator enters the compressor through the optical access window. However, the measurement system in the related technology cannot ensure that the measurement points can completely reach all positions in the compressor rotor channel, so comprehensive compressor flow field information cannot be obtained.

[0004] Therefore, providing a measurement system that can obtain comprehensive compressor flow field information is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The present invention discloses a light guiding device, a measurement system and an installation method for compressor flow field measurement to solve the technical problem that the measurement system in the related technology cannot ensure that the measurement points completely reach all positions in the compressor rotor channel, resulting in the inability to obtain comprehensive compressor flow field information.

[0006] To solve the above problems, the present invention adopts the following technical solutions: The first aspect of the present invention provides a light guiding device for compressor flow field measurement.

[0007] The light guiding device for compressor flow field measurement of the present invention includes a first light guide plate, a second light guide plate, a third light guide plate and a fourth light guide plate. Among them, the first light guide plate, the second light guide plate, the third light guide plate and the fourth light guide plate are located at the axial position of the target area to be measured inside the compressor, and the first light guide plate and the second light guide plate are symmetrically distributed, and the third light guide plate and the fourth light guide plate are symmetrically distributed; the first light guide plate and the third light guide plate are used to make the first laser emitted by the first laser generator enter the target area to be measured through the optical access window, and the second light guide plate and the fourth light guide plate are used to make the second laser emitted by the second laser generator enter the target area to be measured through the optical access window, and the first laser and the second laser intersect in the target area to be measured.

[0008] According to an optional embodiment, the light guiding device for compressor flow field measurement further includes a fifth light guide plate and a sixth light guide plate. The fifth light guide plate and the sixth light guide plate are located at the axial position of the target area to be measured inside the compressor, and the fifth light guide plate and the sixth light guide plate are symmetrically distributed. The fifth light guide plate and the sixth light guide plate are respectively used to make the first laser reflected twice by the third light guide plate and the second laser reflected twice by the fourth light guide plate enter the target area to be measured through the optical access window.

[0009] According to an optional embodiment, a first fixing bracket is provided between the first light guide plate and the fifth light guide plate, and the first fixing bracket is used to connect the first light guide plate and the fifth light guide plate; a second fixing bracket is provided between the second light guide plate and the sixth light guide plate, and the second fixing bracket is used to connect the second light guide plate and the sixth light guide plate.

[0010] According to an optional embodiment, one end of the first fixing bracket is fixedly connected to the first light guide plate, and the fifth light guide plate is rotatably arranged at the other end of the first fixing bracket; one end of the second fixing bracket is fixedly connected to the second light guide plate, and the sixth light guide plate is rotatably arranged at the other end of the second fixing bracket.

[0011] According to an optional embodiment, the value range of the laser incident angle β is: [20°, 30°], and the laser incident angle β is the included angle formed by the intersection of the first laser and the second laser.

[0012] According to an optional embodiment, the value range of the reflection angle α of the fifth light guide plate and the sixth light guide plate is: (45° - β / 4, 90° - β / 4), where the reflection angle α is the angle when the first laser is reflected on the fifth light guide plate, or the reflection angle α is the angle when the second laser is reflected on the sixth light guide plate.

[0013] According to an optional embodiment, the value range of the installation angle γ of the fifth light guide plate and the sixth light guide plate is: (β / 4, 45° - β / 4), where the installation angle γ is the included angle between the fifth light guide plate and the horizontal direction, or the installation angle γ is the included angle between the sixth light guide plate and the horizontal direction.

[0014] The second aspect of the present invention discloses a measurement system for compressor flow field measurement.

[0015] The measurement system for compressor flow field measurement of the present invention includes the light guide device for compressor flow field measurement according to any one of the technical solutions in the present invention.

[0016] The third aspect of the present invention discloses an installation method for a light guide device for compressor flow field measurement.

[0017] The installation method for the light guide device for compressor flow field measurement according to any one of the technical solutions in the present invention includes the following steps: Based on the geometric space of the target area to be measured, determine the laser incident angle β; Based on the laser incident angle β, obtain the first installation position data of the first light guide plate, the second light guide plate, the third light guide plate and the fourth light guide plate, where the first installation position data at least includes the installation angle of each light guide plate and the distance from the target area to be measured; Obtain the second installation position data of the first laser generator and the second laser generator, where the second installation position data at least includes the installation angle of each laser generator and the distance from the first light guide plate, the second light guide plate, the third light guide plate and / or the fourth light guide plate; The first installation position data and the second installation position data are used to make the first laser emitted by the first laser generator and the second laser emitted by the second laser generator enter the target area to be measured through the optical access window, and the first laser and the second laser intersect in the target area to be measured.

[0018] According to an optional embodiment, before installing the first light guide plate, the second light guide plate, the third light guide plate and the fourth light guide plate, the following steps are further included: Determine the reflection angle α of the fifth light guide plate and the sixth light guide plate through the laser incident angle β, and based on the reflection angle α, determine the installation angle γ of the fifth light guide plate and the sixth light guide plate and the distance between the fifth light guide plate and the sixth light guide plate and the target area to be measured.

[0019] The technical solution adopted by the present invention can achieve the following beneficial effects: In a first aspect, for the light guiding device used in the compressor flow field measurement of the present invention, after the first laser emitted by the first laser generator irradiates the third light guiding plate, it is reflected to the first light guiding plate. After the second laser emitted by the second laser generator irradiates the fourth light guiding plate, it is reflected to the second light guiding plate. Through the reflection of the first light guiding plate, the second light guiding plate, the third light guiding plate and the fourth light guiding plate, on the premise of ensuring that the emission angles of the first laser generator and the second laser generator meet the layout requirements, the laser incident angle can be reduced, so that even in the case of a narrow channel, the first laser and the second laser can make the laser measurement points cover the entire target area to be measured, in order to obtain more comprehensive compressor flow field information.

[0020] That is, for the light guiding device used in the compressor flow field measurement of the present invention, it solves the technical problem that the measurement system in the related art cannot ensure that the measurement points completely reach all positions in the compressor rotor channel, resulting in the inability to obtain comprehensive compressor flow field information.

[0021] In a second aspect, for the light guiding device used in the compressor flow field measurement of the present invention, through the reflection of the first light guiding plate, the second light guiding plate, the third light guiding plate and the fourth light guiding plate, the distance between the first laser and the second laser at the optical access window can be reduced, thereby reducing the area of the optical access window, making the geometric curvature of the optical access window smaller, so as to weaken the influence of the casing wall curvature on the optical path. This can not only reduce the possibility of path distortion when the first laser and the second laser pass through the optical access window, but also reduce the local gap caused by the incomplete matching of the curved casing wall and the optical window, and can also avoid the problem that the internal flow field of the compressor changes due to an overly large optical access window. By reducing the area of the optical access window, the present invention can also suppress beam offset and maintain the straightness of the laser beam to meet the sub-millimeter-level measurement accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the light guiding device for compressor flow field measurement according to an embodiment of the present application; Figure 2 is a schematic diagram of the optical path when the reflection angles of the fifth light guiding plate and the sixth light guiding plate in the embodiment of the present application are the largest; Figure 3 is a schematic diagram of the optical path when the reflection angles of the fifth light guiding plate and the sixth light guiding plate in the embodiment of the present application are the smallest; Figure 4It is a schematic diagram of the optical access path of the rotor channel in the embodiment of the present application.

[0024] In the figure: 110, the first light guide plate; 120, the second light guide plate; 130, the third light guide plate; 140, the fourth light guide plate; 150, the fifth light guide plate; 160, the sixth light guide plate; 170, the first fixing bracket; 180, the second fixing bracket; 210, the first laser generator; 220, the second laser generator; 310, the area to be measured; 320, the optical access window; 330, the casing; 340, the laser measurement point; 350, the measurement area; 360, the hub. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0026] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0027] The measurement system in the related art uses a laser generator as the light source, and an optical access window is opened on the casing wall surface. The laser emitted by the laser generator enters the compressor interior through the optical access window. The inventor found in the research that this kind of measurement system has at least the following defects: (1) The characteristic size of the rotor blade channel of the compressor is usually dozens of millimeters, while the diameter of the laser emission device (including the optical collimation system) generally exceeds 15 cm, resulting in a serious shortage of physical installation space; (2) The three-dimensional shape of the blades of some compressors has a large twist and there are large and small blades, resulting in the twisted blades blocking the channel, and the blade channel is narrow, so that the laser cannot irradiate the area to be measured; (3) The geometric curvature of the casing wall surface of some compressors is relatively large, so that the curvature of the optical access window opened on the casing wall surface is relatively large, which may cause the problem of laser path distortion. The above defects cause the measurement system in the related art to be unable to ensure that the measurement points can completely reach all positions in the rotor channel, and thus it is impossible to obtain comprehensive compressor flow field information.

[0028] Through multi-path combination, the present application can construct a reliable optical path, expand the measurement range, ensure that the laser incident angle is within a reasonable range, and at the same time ensure that the laser measurement points can cover the entire target area to be measured, so as to obtain more comprehensive compressor flow field information. In addition, the opening area of the optical access window can be reduced, and the hidden danger of laser path distortion caused by the large curvature of the optical access window can be reduced, ensuring more accurate measurement of the flow field.

[0029] The following combines the attached Figures 1 to 4 drawings, and through specific embodiments and their application scenarios, the light guiding device, measurement system and installation method provided by the present application for compressor flow field measurement are described in detail.

[0030] The first aspect of this embodiment will be described in detail for the light guiding device for compressor flow field measurement.

[0031] The light guiding device of this embodiment is used for compressor flow field measurement, and is particularly suitable for compressors with highly twisted blades, narrow channels and / or curved casings.

[0032] The light guiding device for compressor flow field measurement in this embodiment includes a first light guiding plate 110, a second light guiding plate 120, a third light guiding plate 130 and a fourth light guiding plate 140, as Figure 1 shown. The first light guiding plate 110, the second light guiding plate 120, the third light guiding plate 130 and the fourth light guiding plate 140 are located at the axial position of the target area 310 to be measured inside the compressor, and the first light guiding plate 110 and the second light guiding plate 120 are symmetrically distributed, and the third light guiding plate 130 and the fourth light guiding plate 140 are symmetrically distributed, as Figure 1 shown. The light guiding device for compressor flow field measurement in this embodiment is divided into two symmetrically arranged parts, and the two parts are symmetrically arranged on both sides of the center line. The first light guiding plate 110 and the third light guiding plate 130 are a group, which are used to reflect the first laser emitted by the first laser generator 210; the second light guiding plate 120 and the fourth light guiding plate 140 are a group, which are used to reflect the second laser emitted by the second laser generator 220.

[0033] In some embodiments, the first light guiding plate 110 and the third light guiding plate 130 are used to make the first laser emitted by the first laser generator 210 enter the target area 310 to be measured through the optical access window 320, and the second light guiding plate 120 and the fourth light guiding plate 140 are used to make the second laser emitted by the second laser generator 220 enter the target area 310 to be measured through the optical access window 320, and the first laser and the second laser intersect in the target area 310 to be measured, as Figures 1 to 4As shown in the figure. The path of the first laser can be changed by the first light guide plate 110 and the third light guide plate 130, and the path of the second laser can be changed by the second light guide plate 120 and the fourth light guide plate 140. The first laser and the second laser can bypass the occlusion of the twisted blade on the channel, ensuring that the laser measurement point 340 can reach the high-density flow field area of the channel, including key positions such as the blade root and the tip clearance.

[0034] The light guide device for compressor flow field measurement in this embodiment is divided into two symmetrically arranged parts, which can reflect the first laser and the second laser respectively. The compressor flow field is measured by two lasers. Compared with a single laser, the requirements for the detector can be reduced, the measurement accuracy can be improved, and the problem of using a single laser that requires a detector with extremely high frequency resolution can be avoided. On the other hand, the symmetric optical path design effectively improves the spatial resolution and anti-interference performance of the measurement system.

[0035] In the light guide device for compressor flow field measurement in this embodiment, after the first laser emitted by the first laser generator 210 irradiates the third light guide plate 130, it is reflected to the first light guide plate 110. After the second laser emitted by the second laser generator 220 irradiates the fourth light guide plate 140, it is reflected to the second light guide plate 120. Through the reflection of the first light guide plate 110, the second light guide plate 120, the third light guide plate 130 and the fourth light guide plate 140, on the premise that the emission angles of the first laser generator 210 and the second laser generator 220 meet the layout requirements, the laser incident angle can be reduced, so that even in the case of a narrow channel, the laser measurement point 340 can cover the entire target area to be measured 310, in order to obtain more comprehensive compressor flow field information.

[0036] That is, the light guide device for compressor flow field measurement in this embodiment solves the technical problem that the measurement system in the related art cannot ensure that the measurement points completely reach all positions in the compressor rotor channel, resulting in the inability to obtain comprehensive compressor flow field information.

[0037] On the other hand, the light guiding device for compressor flow field measurement in this embodiment can reduce the distance between the first laser and the second laser at the optical access window 320 through the reflection of the first light guide plate 110, the second light guide plate 120, the third light guide plate 130, and the fourth light guide plate 140. As a result, the area of the optical access window 320 can be reduced, making the geometric curvature of the optical access window 320 smaller to weaken the influence of the curvature of the casing 330 wall on the optical path. This can not only reduce the possibility of path distortion when the first laser and the second laser pass through the optical access window 320, but also reduce the local gap caused by the incomplete matching between the curved casing 330 wall and the optical window, and can also avoid the problem of the change of the internal flow field of the compressor caused by the over-large optical access window 320. By reducing the area of the optical access window 320 in this embodiment, beam offset can also be suppressed while maintaining the straightness of the laser beam to meet the sub-millimeter measurement accuracy requirements.

[0038] In some embodiments, the light guiding device for compressor flow field measurement further includes a fifth light guide plate 150 and a sixth light guide plate 160, as Figure 1 shown. The fifth light guide plate 150 and the sixth light guide plate 160 are located at the axial position of the target area 310 to be measured inside the compressor, and the fifth light guide plate 150 and the sixth light guide plate 160 are symmetrically distributed, as Figure 1 shown. The fifth light guide plate 150 and the sixth light guide plate 160 are respectively used to make the first laser reflected by the third light guide plate 130 twice and the second laser reflected by the fourth light guide plate 140 twice enter the target area 310 to be measured through the optical access window 320.

[0039] As Figure 1 shown, the path of the first laser emitted by the first laser generator 210 is as follows: the first laser irradiates on the third light guide plate 130, after being reflected by the third light guide plate 130, the first laser irradiates on the first light guide plate 110, after being reflected by the first light guide plate 110, the first laser irradiates on the third light guide plate 130 again, after being reflected by the third light guide plate 130, the first laser irradiates on the fifth light guide plate 150, and after being reflected by the fifth light guide plate 150, it irradiates on the target area 310 to be measured.

[0040] Referring again to Figure 1 , the path of the second laser emitted by the second laser generator 220 is as follows: after the second laser irradiates on the fourth light guide plate 140, after being reflected by the fourth light guide plate 140, the second laser irradiates on the second light guide plate 120, after being reflected by the second light guide plate 120, the second laser irradiates on the fourth light guide plate 140 again, after being reflected by the fourth light guide plate 140, the second laser irradiates on the sixth light guide plate 160, and after being reflected by the sixth light guide plate 160, it irradiates on the target area 310 to be measured.

[0041] The light guiding device for compressor flow field measurement in this embodiment can enhance the folding property of the first laser and the second laser by arranging the fifth light guiding plate 150 and the sixth light guiding plate 160, which is beneficial for the first laser and the second laser to bypass more obstacles to cover the entire target area to be measured 310. That is to say, in this embodiment, by increasing the number of light guiding plates, the ability of the first laser and the second laser to avoid complex blade layouts is improved; on the other hand, by arranging the fifth light guiding plate 150 and the sixth light guiding plate 160, the first laser and the second laser can achieve a longer equivalent optical path in a limited space, which is beneficial for the first laser and the second laser to penetrate deep into the blade channels, and is also beneficial for the first laser and the second laser entering the compressor to irradiate the optical access window 320 in an almost perpendicular manner to reduce refractive distortion, thereby improving the measurement accuracy.

[0042] In some embodiments, a first fixing bracket 170 is provided between the first light guiding plate 110 and the fifth light guiding plate 150. The first fixing bracket 170 is used to connect the first light guiding plate 110 and the fifth light guiding plate 150, as Figure 1 shown. A second fixing bracket 180 is provided between the second light guiding plate 120 and the sixth light guiding plate 160. The second fixing bracket 180 is used to connect the second light guiding plate 120 and the sixth light guiding plate 160, as Figure 1 shown.

[0043] Preferably, one end of the first fixing bracket 170 is fixedly connected to the first light guiding plate 110, and the fifth light guiding plate 150 is rotatably arranged at the other end of the first fixing bracket 170. One end of the second fixing bracket 180 is fixedly connected to the second light guiding plate 120, and the sixth light guiding plate 160 is rotatably arranged at the other end of the second fixing bracket 180. Exemplarily, the first fixing bracket 170 and the first light guiding plate 110, and the second fixing bracket 180 and the second light guiding plate 120 can be fixedly connected by means such as welding, bonding, and connecting with fixing parts. The first fixing bracket 170 and the fifth light guiding plate 150, and the second fixing bracket 180 and the sixth light guiding plate 160 can be rotatably connected by hinge. Specifically, the installation angles of the fifth light guiding plate 150 and the sixth light guiding plate 160 can be adjusted manually or automatically. The structures of the rotational connections between the first fixing bracket 170 and the fifth light guiding plate 150, and between the second fixing bracket 180 and the sixth light guiding plate 160 can be the structures in the prior art and will not be elaborated here.

[0044] The light guiding device for compressor flow field measurement in this embodiment is provided with the first fixing bracket 170 and the second fixing bracket 180. The first light guiding plate 110 and the second light guiding plate 120 can be fixed by the first fixing bracket 170 and the second fixing bracket 180 to ensure the stability of the optical paths of the first laser and the second laser.

[0045] In this embodiment, the fifth light guide plate 150 is rotatably arranged at the other end of the first fixed bracket 170, and the sixth light guide plate 160 is rotatably arranged at the other end of the second fixed bracket 180. After the precise calibration of the first laser generator 210 and the second laser generator 220 with the first to fourth light guide plates 110-140 is completed, the installation angles γ of the fifth light guide plate 150 and the sixth light guide plate 160 can be adjusted based on the real-time working conditions of the compressor to achieve fine adjustment of the incident angles of the first laser and the second laser, thereby completing the precise optical path coverage of the target area. On the other hand, in this embodiment, the fifth light guide plate 150 is rotatably arranged at the other end of the first fixed bracket 170, and the sixth light guide plate 160 is rotatably arranged at the other end of the second fixed bracket 180. By simply adjusting the installation angles of the fifth light guide plate 150 and the sixth light guide plate 160 appropriately, it can be applicable to different target areas 310 to be measured. That is, the light guide device of this embodiment can achieve flexible measurement of various working conditions without disassembly of the precursor, significantly improving the integrity of complex flow field data and providing a reliable experimental basis for the evaluation and optimization of the aerodynamic performance of the compressor.

[0046] In some embodiments, the value range of the laser incident angle β is: [20°, 30°]. The laser incident angle β is the included angle formed by the intersection of the first laser and the second laser. As Figures 2 to 4 shown. That is, the laser incident angle β is 20°-30°, including 20° and 30°.

[0047] The light guide device for compressor flow field measurement in this embodiment, with the laser incident angle β being 20°-30°, has at least the following advantages: (1) It is beneficial to obtain a reasonable laser frequency bandwidth, reduce the interference of signal-to-noise ratio, and can be applicable to a relatively wide speed distribution in the compressor, such as the high-speed tip region and the low-flow separation region; (2) It is beneficial for the laser to enter the compressor interior through the optical access window 320, avoiding the potential hazards of deviation of the refraction angle or optical distortion caused by too large a laser incident angle, and also avoiding the problem that the laser measurement point 340 cannot reach the target area 310 to be measured due to too small an incident angle; (3) It can improve the reliability of the optical path passing through the blade gap, reduce the multi-path reflection interference (such as scattered light on the blade surface), and is beneficial for the two laser beams to pass through the blade channels inside the compressor and for the first laser and the second laser to intersect in the target area 310 to be measured; (4) It is beneficial to reduce the installation requirements for the fifth light guide plate 150 and the sixth light guide plate 160, and has a relatively high tolerance for the installation angles of the fifth light guide plate 150 and the sixth light guide plate 160 (up to ±1°).

[0048] In some embodiments, the value range of the reflection angle α of the fifth light guide plate 150 and the sixth light guide plate 160 is: (45° - β / 4, 90° - β / 4), where the reflection angle α is the angle when the first laser is reflected on the fifth light guide plate 150, or the reflection angle α is the angle when the second laser is reflected on the sixth light guide plate 160. AsFigures 2 to 4 as shown

[0049] In some embodiments, the installation angle γ of the fifth light guide plate 150 and the sixth light guide plate 160 ranges from: (β / 4, 45° - β / 4), where the installation angle γ is the angle between the fifth light guide plate 150 and the horizontal direction, or the installation angle γ is the angle between the sixth light guide plate 160 and the horizontal direction, as Figure 2 and Figure 3 shown

[0050] As Figure 2 shown, taking the first laser as an example, when the first laser is horizontally irradiated to point L, at this time the first laser cannot irradiate the third light guide plate 130, and the reflection angle α at this time is the critical maximum value (90° - β / 4), and the installation angle of the fifth light guide plate 150 is the critical minimum value β / 4. Similarly, the critical maximum value of the reflection angle α of the second laser is (90° - β / 4), and the critical minimum value of the installation angle of the sixth light guide plate 160 is β / 4.

[0051] As Figure 3 shown, taking the first laser as an example, when the first laser is irradiated on the fifth light guide plate 150 perpendicular to the normal of the third light guide plate 130, since the laser incident angle is very small and the laser generator has a certain size, the laser generator cannot be placed at points G and H of the reflection point. At this time, the reflection angle α is the critical minimum value (45° - β / 4), and the installation angle of the fifth light guide plate 150 is the critical maximum value (45° - β / 4). Similarly, the critical maximum value of the reflection angle α of the second laser is (45° - β / 4), and the critical minimum value of the installation angle of the sixth light guide plate 160 is (45° - β / 4).

[0052] The light guide device for compressor flow field measurement in this embodiment has a simple structure. Only two laser generators, four fixed light guide plates and two adjustable light guide plates are needed to complete the construction of the bilateral optical path. The number of components is small and the installation process is simplified; the modular light guide plate group and the mirror-symmetrical structure design significantly reduce the overall volume and manufacturing cost of the device and are suitable for a variety of compressor experimental scenarios.

[0053] The second aspect of this embodiment details the measurement system for compressor flow field measurement.

[0054] The measurement system for compressor flow field measurement in this embodiment includes the light guide device for compressor flow field measurement in any one of the technical solutions in the first aspect of this embodiment. Without limitation, the measurement system also includes structures such as a first laser generator 210, a second laser generator 220, and a detector. The remaining structures of the measurement system can be the same as those in the prior art and will not be elaborated here.

[0055] The measurement system for compressor flow field measurement in this embodiment can also enable the laser measurement point 340 to reach the target area to be measured 310 even in the case of a narrow channel, so as to obtain more comprehensive compressor flow field information, and is also beneficial to reducing the area of the optical access window 320.

[0056] The third aspect of this embodiment details the installation method of the light guiding device for compressor flow field measurement.

[0057] The installation method of the light guiding device for compressor flow field measurement according to any one of the technical solutions in the first aspect of this embodiment includes the following steps: Step 100: Determine the laser incident angle β based on the geometric space of the target area to be measured 310.

[0058] Step 200: Based on the laser incident angle β, obtain the first installation position data of the first light guiding plate 110, the second light guiding plate 120, the third light guiding plate 130, and the fourth light guiding plate 140. Among them, the first installation position data at least includes the installation angles of each light guiding plate and the distance from the target area to be measured 310.

[0059] Step 300: Obtain the second installation position data of the first laser generator 210 and the second laser generator 220. Among them, the second installation position data at least includes the installation angles of each laser generator and the distance from the first light guiding plate 110, the second light guiding plate 120, the third light guiding plate 130, and / or the fourth light guiding plate 140.

[0060] Step 400: The first installation position data and the second installation position data are used to enable the first laser emitted by the first laser generator 210 and the second laser emitted by the second laser generator 220 to enter the target area to be measured 310 through the optical access window 320, and the first laser and the second laser intersect in the target area to be measured 310.

[0061] Exemplarily, the third light guiding plate 130 and the fourth light guiding plate 140 can be horizontally installed, and then based on the laser incident angle β, the coordinates of each incident point are determined by the ray tracing method, and then the incident angle and the reflection angle are determined, so as to determine the installation positions and installation angles of the first light guiding plate 110, the second light guiding plate 120, the first laser generator 210, and the second laser generator 220.

[0062] For the installation method of the light guiding device for compressor flow field measurement in this embodiment, the lasers emitted by the first laser generator 210 and the second laser generator 220 can also enable the laser measurement point 340 to cover the entire target area to be measured 310 even in the case of a narrow channel through the action of the first light guiding plate 110, the second light guiding plate 120, the third light guiding plate 130, and the fourth light guiding plate 140, so as to obtain more comprehensive compressor flow field information, and is also beneficial to reducing the area of the optical access window 320.

[0063] In some embodiments, before installing the first light guide plate 110, the second light guide plate 120, the third light guide plate 130, and the fourth light guide plate 140, the following steps are further included: Determine the reflection angle α of the fifth light guide plate 150 and the sixth light guide plate 160 through the laser incident angle β, and determine the installation angle γ of the fifth light guide plate 150 and the sixth light guide plate 160 and the distances between the fifth light guide plate 150 and the sixth light guide plate 160 and the target area 310 to be measured based on the reflection angle α.

[0064] Exemplarily, when the light guide device includes the fifth light guide plate 150 and the sixth light guide plate 160, first determine the installation position data of the fifth light guide plate 150 and the sixth light guide plate 160 based on the incident angle β, and then determine the installation position data of the first light guide plate 110, the second light guide plate 120, the third light guide plate 130, the fourth light guide plate 140, the first laser generator 210, and the second laser generator 220 through the ray tracing method.

[0065] Specifically, determining the laser incident angle β, the installation position data of the fifth light guide plate 150 and the sixth light guide plate 160, and the installation position data of the first light guide plate 110, the second light guide plate 120, the third light guide plate 130, the fourth light guide plate 140, the first laser generator 210, and the second laser generator 220 includes the following steps (illustrated by taking the first laser emitted by the first laser generator 210 as an example): First, after analyzing the geometric space of the target area 310 to be measured and determining the area to be measured, select a laser incident angle within a reasonable range. Exemplarily, if the channel of the target area 310 to be measured is relatively large, a slightly larger laser incident angle can be selected; if the channel of the target area 310 to be measured is relatively small, a slightly smaller laser incident angle can be selected. The laser incident angle β is 20° - 30°.

[0066] Second, the horizontal distance from the last laser reflection point to the laser measurement point 340 can be determined based on the size of the casing 330, and then the laser light path is drawn to determine the incident points of the laser on the first light guide plate 110 and the third light guide plate 130. According to the incident points and the horizontal distance, determine the laser reflection angle and the installation angles of the first light guide plate 110 and the third light guide plate 130. Reasonably select the sizes of the first light guide plate 110, the third light guide plate 130, and the fifth light guide plate 150 according to requirements. Finally, based on the above conditions, determine the installation position and the emission inclination angle of the first laser generator 210. The sizes of the first light guide plate 110, the third light guide plate 130, and the fifth light guide plate 150 can be designed according to the light path requirements and space requirements.

[0067] With Figure 2 and Figure 3For example, after determining the laser incident angle β, assume that the horizontal distance from the incident point (also known as the reflection point) L, W to the laser measuring point 340 is x. Further, the angle range of the reflection angle α can be determined by the value of the laser incident angle β. Figure 3 As shown, at this time, the reflection angle α obtains a critical maximum value of 90°-β / 4, and the installation angle γ of the fifth light guide plate 150 is β / 4. Figure 4 As shown, at this time, the reflection angle α obtains the critical minimum value, and the installation angle γ=α of the fifth light guide plate 150. Further, the positions of the reflection points L and W are determined by the horizontal distance x, thereby determining the installation position of the fifth light guide plate 150.

[0068] Furthermore, based on the conditions obtained above, the following optical path construction steps are implemented: First, the third light guide plate 130 is arranged horizontally along the center line, and the precise coordinates of point G are determined by the ray tracing method, and the incident angle of the first laser on the surface of the third light guide plate 130 and its corresponding reflection angle are calculated accordingly. Then, the reflection angle of the first light guide plate 110 is derived according to the principle of optical path symmetry, and the position of the incident point on the first light guide plate 110 is simultaneously determined. Through cross-iterative calculation, the correlation equation between the incident angle of the first light guide plate 110 and the reflection angle of the third light guide plate 130 is established, and finally the optimal installation position of the first laser generator 210 is solved. At this point, the topological construction of the upper optical path system is completed, and the lower optical path system is configured according to the principle of mirror symmetry.

[0069] During the assembly stage, after completing the precise calibration of the laser and each light guide plate, the directivity of the first laser or the second laser is fine-tuned by adjusting the installation angle γ of the fifth light guide plate 150 and the sixth light guide plate 160, thereby completing the precise optical path coverage of the target area 310 to be measured.

[0070] Furthermore, if Figure 4 As shown, the target area 310 to be measured is located on the wheel hub 360, the laser measuring point 340 is located on the wheel hub 360, and the measuring area 350 is between the optical access window 320 and the wheel hub 360. Determine the laser incident angle β, and assume that the limit height from the optical access window 320 to the laser measuring point 340 is h, and the vertical projection width d of the first laser beam and the second laser beam at the optical access window 320 is: d=2×h×tanβ / 2.

[0071] It should be noted that, in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0072] In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0073] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A light guide device for compressor flow field measurement, characterized in that: Comprising a first light guide plate (110), a second light guide plate (120), a third light guide plate (130) and a fourth light guide plate (140), wherein the first light guide plate (110), the second light guide plate (120), the third light guide plate (130) and the fourth light guide plate (140) are located at an axial position of a target area (310) to be measured inside the compressor, and the first light guide plate (110) and the second light guide plate (120) are symmetrically distributed, and the third light guide plate (130) and the fourth light guide plate (140) are symmetrically distributed; The first light guide plate (110) and the third light guide plate (130) are used to allow a first laser emitted by a first laser generator (210) to enter the target area (310) to be measured through an optical access window (320); the second light guide plate (120) and the fourth light guide plate (140) are used to allow a second laser emitted by a second laser generator (220) to enter the target area (310) to be measured through the optical access window (320); and the first laser and the second laser intersect in the target area (310) to be measured.

2. The light guide device for compressor flow field measurement according to claim 1, characterized in that: The invention also comprises a fifth light guide plate (150) and a sixth light guide plate (160), wherein the fifth light guide plate (150) and the sixth light guide plate (160) are located at an axial position of a target area (310) to be measured inside the compressor, and the fifth light guide plate (150) and the sixth light guide plate (160) are symmetrically distributed. The fifth light guide plate (150) and the sixth light guide plate (160) are respectively used to allow the first laser light secondary reflected by the third light guide plate (130) and the second laser light secondary reflected by the fourth light guide plate (140) to enter the target area (310) to be measured through the optical access window (320).

3. The light guide device for compressor flow field measurement according to claim 2, characterized in that: A first fixing bracket (170) is provided between the first light guide plate (110) and the fifth light guide plate (150), and the first fixing bracket (170) is used to connect the first light guide plate (110) and the fifth light guide plate (150); and a second fixing bracket (180) is provided between the second light guide plate (120) and the sixth light guide plate (160), and the second fixing bracket (180) is used to connect the second light guide plate (120) and the sixth light guide plate (160).

4. The light guiding device for compressor flow field measurement according to claim 3, characterized in that: One end of the first fixed bracket (170) is fixedly connected to the first light guide plate (110), and the fifth light guide plate (150) is rotatably arranged on the other end of the first fixed bracket (170); One end of the second fixed bracket (180) is fixedly connected to the second light guide plate (120), and the sixth light guide plate (160) is rotatably arranged on the other end of the second fixed bracket (180).

5. The light guiding device for compressor flow field measurement according to any one of claims 2 to 4, characterized in that: The laser incident angle β has a value range of [20°, 30°], and the laser incident angle β is an angle formed by the intersection of the first laser and the second laser.

6. The light guiding device for compressor flow field measurement according to claim 5, characterized in that: The value range of the reflection angle α of the fifth light guide plate (150) and the sixth light guide plate (160) is: (45°-β / 4, 90°-β / 4), wherein the reflection angle α is the angle at which the first laser is reflected when irradiated on the fifth light guide plate (150), or the reflection angle α is the angle at which the second laser is reflected when irradiated on the sixth light guide plate (160).

7. The light guiding device for compressor flow field measurement according to claim 6, characterized in that: The value range of the installation angle γ of the fifth light guide plate (150) and the sixth light guide plate (160) is: (β / 4, 45°-β / 4), wherein the installation angle γ is the angle between the fifth light guide plate (150) and the horizontal direction, or the installation angle γ is the angle between the sixth light guide plate (160) and the horizontal direction.

8. A measurement system for compressor flow field measurement, characterized in that: A light guiding device for compressor flow field measurement comprising any one of claims 1 to 7.

9. A method for installing a light guide device for compressor flow field measurement according to any one of claims 1 to 7, characterized in that: The steps include: Determining a laser incident angle β based on the geometric space of the target area (310) to be measured; Based on the laser incident angle β, first installation position data of the first light guide plate (110), the second light guide plate (120), the third light guide plate (130) and the fourth light guide plate (140) are obtained, wherein the first installation position data at least includes the installation angle of each light guide plate and the distance from the target area (310) to be measured; Acquiring second installation position data of the first laser generator (210) and the second laser generator (220), wherein the second installation position data at least includes the installation angle of each laser generator, and the distance from the first light guide plate (110), the second light guide plate (120), the third light guide plate (130) and / or the fourth light guide plate (140); The first installation position data and the second installation position data are used to enable a first laser emitted by a first laser generator (210) and a second laser emitted by a second laser generator (220) to enter the target area to be measured (310) through an optical access window (320), and the first laser and the second laser to intersect in the target area to be measured (310).

10. The method for installing the light guide device for compressor flow field measurement according to claim 9, characterized in that: Before installing the first light guide plate (110), the second light guide plate (120), the third light guide plate (130) and the fourth light guide plate (140), the following steps are also included: The reflection angle α of the fifth light guide plate (150) and the sixth light guide plate (160) is determined by the laser incident angle β, and the installation angle γ of the fifth light guide plate (150) and the sixth light guide plate (160) and the distance between the fifth light guide plate (150) and the sixth light guide plate (160) and the target area (310) to be measured are determined based on the reflection angle α.

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