CN116147875A - Anti-pollution plane laser generation device of miniature probing type air film - Google Patents
Anti-pollution plane laser generation device of miniature probing type air film Download PDFInfo
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- CN116147875A CN116147875A CN202310441515.4A CN202310441515A CN116147875A CN 116147875 A CN116147875 A CN 116147875A CN 202310441515 A CN202310441515 A CN 202310441515A CN 116147875 A CN116147875 A CN 116147875A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of inner flow aerodynamic optical measurement, and discloses a microminiature probing type air film anti-pollution plane laser generating device. The plane laser generating device comprises a device main body and a protective air film generating system; the circular light beam of the external laser source is conditioned by the plano-convex lens of the device main body and then is injected into the plano-concave cylindrical lens along the central axis of the cavity of the supporting rod, and is conditioned by the plano-concave cylindrical lens to form a rectangular light beam, and then is reflected and expanded by the reflecting mirror to form the planar laser source; the high-pressure air source of the protective air film generating system sprays high-pressure air flow through the high-pressure pipeline, and a high-speed air film is formed on the surface of the reflecting mirror, so that the reflecting mirror is effectively prevented from being polluted. The planar laser generating device has small interference to the flow field to be detected, the generated planar laser light source can be inserted into a closed airflow channel or pipeline with a shell, such as an aero-engine, and the like, and can conveniently adjust the plane light emitting angle of the laser, so that the planar laser generating device is suitable for optical measurement experiments in the aero-engine or other airflow pipelines.
Description
Technical Field
The invention belongs to the technical field of inner flow aerodynamic optical measurement, and particularly relates to a microminiature probing type air film anti-pollution plane laser generating device.
Background
The laser has the advantages of high brightness, good directivity and good monochromaticity, and is often used as a light source for optical measurement experiments. Because planar laser (the thickness is usually 1 mm-2 mm) has the characteristic of being easier to combine with fixed focus imaging and image analysis processing technology, the method is widely applied to optical measurement technologies such as Particle Image Velocimetry (PIV), planar Laser Induced Fluorescence (PLIF), laser profile measurement (LP) and Flow Visualization (FV) and promotes the rapid development of the optical measurement technologies. PIV, PLIF, LP and FV technologies have become the most effective means of flow field measurement and analysis today.
When the PIV, PLIF and other technologies are adopted to carry out flow field optical measurement experimental study, flow field trace particles are required to be uniformly scattered in a flow field, then a plane laser light source is led to a designated measurement section, and flow field parameter distribution characteristics such as relative speed or concentration and temperature of the measurement section are obtained by shooting illuminated (or excited) trace particle images. The trace particles commonly used in PIV experiments include solid powders such as titanium dioxide, aluminum oxide, etc., tiny droplets such as dioctyl sebacate (DEHS), and the trace particles commonly used in PLIF experiments include rhodamine 6G (for concentration measurement), rhodamine B (for temperature measurement), and sodium dihydrogen phosphate fluorescent powder (for temperature or concentration measurement).
However, two types of technical difficulties are commonly encountered when performing flow field measurement experiments in an aircraft engine or other airflow duct using PIV and PLIF techniques. The method comprises the following steps: the guiding problem of the plane laser light source is influenced by the shielding of the pipe wall, the casing or the blades; secondly, the PIV and PLIF measure the problem that the required trace substances pollute the plane laser light source. The two kinds of technical problems are the key to restrict the experimental efficiency of the measurement of the internal flow PIV and the PLIF and even determine the success or failure of the experiment.
Currently, development of a microminiature detection type air film anti-pollution planar laser generating device is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art of inner flow aerodynamic optical measurement technology of aeroengines and the like and provides a microminiature penetration type air film anti-pollution plane laser generating device.
The invention relates to a microminiature probing type air film anti-pollution plane laser generating device which is characterized by comprising a device main body and a protective air film generating system;
the device body is a three-section step pipe body which is sequentially connected from top to bottom, and the outer diameter of the three-section step pipe body is sequentially reduced from top to bottom; the top end of the step pipe body I is a laser access port, and a circular concave cavity is arranged in the step pipe body I; the outer surface of the step pipe body II is provided with a mounting wire opening; the step pipe body III is sequentially provided with a cylinder section and an extension section from top to bottom, the cylinder section is a penetrating type supporting rod, the extension section is provided with a supporting table, and a reflecting mirror is arranged on the supporting table; the inner cavity pipeline of the step pipe body II and the inner cavity pipeline of the step pipe body III are communicated up and down and have the same inner diameter, so that a supporting rod cavity is formed together, and the supporting rod cavity is communicated with the circular concave cavity of the step pipe body I; the central axes of the three-section step pipe body, the round concave cavity and the supporting rod cavity are coincided with the central axis of the device main body; a plano-convex lens is fixedly arranged at the top end of the cavity of the supporting rod, a laser plane angle adjusting block is embedded at the tail end of the cavity of the supporting rod, a plano-concave cylindrical lens is arranged in the laser plane angle adjusting block, and the laser plane angle adjusting block rotates in a range of 0-90 degrees around the central axis of the device main body to drive the central axis of the plano-concave cylindrical lens to rotate in a range of 0-90 degrees around the central axis of the device main body;
the protective air film generation system comprises an external high-pressure air source and a high-pressure pipeline communicated with the high-pressure air source, wherein the high-pressure pipeline is inserted into the circular concave cavity from the side wall of the step pipe body I, extends out through the pipe wall of the step pipe body II, extends to the supporting table along the outer wall of the step pipe body III and is inserted into an inclined hole of the supporting table, and an outlet of the inclined hole is positioned above the reflecting mirror;
the light source outlet of the external laser light source is connected with the laser access port, the round light beam of the external laser light source is conditioned by the plano-convex lens and then is emitted into the plano-concave cylindrical lens along the central axis of the cavity of the support rod, a rectangular light beam is formed by the adjustment of the plano-concave cylindrical lens, and then the rectangular light beam is reflected and expanded by the reflector to form a planar laser light source; high-pressure air of the high-pressure air source flows through the high-pressure pipeline and is sprayed out of the inclined hole outlet, the sprayed high-pressure air forms a high-speed air film, and the high-speed air film flushes the surface of the reflecting mirror.
Further, the pressure range of the high-pressure air source is 0.2-0.5 MPa.
Further, the device main body and the high-pressure pipeline are made of stainless steel.
Further, the outer diameter range of the penetrating type supporting rod is 8 mm-20 mm.
Further, the included angle between the central axis of the inclined hole and the central axis of the device main body is 45 degrees, and the included angle between the mirror surface of the reflecting mirror and the central axis of the device main body is also 45 degrees.
The miniature probing type air film anti-pollution plane laser generating device has the following characteristics:
a. the plane laser light source is generated inside an airflow channel with a shell closed structure, such as an aeroengine, through the penetrating type supporting rod, the plano-convex lens, the plano-concave cylindrical lens and the reflecting mirror.
b. The included angle between the laser plane of the plane laser source and the central axis is randomly adjusted within the range of 0-90 degrees by the laser plane angle adjusting block, and the operation is simple, convenient and flexible.
c. The high-speed air film formed by the protective air film generating system isolates the mirror surface of the reflecting mirror from the pollution source, so that a stable anti-pollution plane laser light source is formed.
d. The penetrating type supporting rod is installed in the tested aeroengine casing or other airflow pipelines through the installation wire opening, the penetrating type supporting rod is small in size and is usually arranged at the downstream of a to-be-tested flow field, and the interference of the to-be-tested flow field is small.
The anti-pollution action section of the microminiature probing type air film anti-pollution plane laser generating device is a tubular nozzle structure of the high-pressure pipeline, high-pressure air of the high-pressure air source flows through the high-pressure pipeline and is sprayed out from the inclined hole, the sprayed high-pressure air forms a high-speed air film, the high-speed air film washes the surface of the reflecting mirror, and a layer of plane protection film is formed on the surface of the reflecting mirror, so that new impurities can be effectively prevented from adhering to the mirror surface of the reflecting mirror, impurities existing in the mirror surface of the reflecting mirror can be blown out, and the blowing-out capability is strong; the high-speed air film is sprayed out along the surface of the reflector, the direction of the high-speed air film is approximately parallel to the reflector, and an included angle of 45 degrees is formed between the high-speed air film and the penetrating type supporting rod. Because the blowing capacity of the high-speed air film is stronger, the device is suitable for measuring the flow field speed with higher flow speed.
The microminiature detection type air film anti-pollution plane laser generating device has small interference on a flow field to be detected, the generated high-energy plane laser light source can detect into a closed air flow channel or pipeline with a shell of an aeroengine and the like, the high-speed air film can remove or isolate water vapor, dust, trace particles and other foreign matters in detected air flow, the light-emitting position of the plane laser light source is prevented from being polluted, and the laser plane angle adjusting block can conveniently adjust the light-emitting angle of the plane laser light source, so that the microminiature detection type air film anti-pollution plane laser generating device is suitable for optical measurement experiments of turbine casings or other air flow pipelines.
Drawings
FIG. 1a is a schematic diagram (cross-sectional view) of a micro-type detection type air film anti-pollution planar laser generating device according to the present invention;
FIG. 1b is a schematic diagram (front view) of a micro-type detection type air film anti-pollution planar laser generating device;
FIG. 1c is a schematic diagram (plan view) of a micro-type detection type air film anti-pollution planar laser generating device;
fig. 2a is a schematic view of the local enlargement of the end a of the micro-penetration type air film anti-pollution planar laser generating device and the light emitting angle of the planar laser light source (the included angle between the light emitting angle and the central axis of the device body is 0 °);
fig. 2b is a schematic view of the local enlargement of the end a of the micro-type probing type air film anti-pollution planar laser generating device and the light emitting angle of the planar laser light source (the included angle between the end a and the central axis of the device body is 90 °).
In the figure, 1. A penetrating type supporting rod; 2. a plano-convex lens; 3. a plano-concave cylindrical lens; 4. a reflecting mirror; 5. a high pressure pipe; 6. a laser access port; 7. a laser plane angle adjusting block; 8. and installing a wire opening.
Description of the embodiments
The invention is described in detail below with reference to the drawings and examples.
Example 1
As shown in fig. 1 a-1 c, the diameter of the penetrating type supporting rod 1 is 12mm, the inner diameter of the supporting rod cavity is 10mm, the laser access port 6 is connected with an external laser light source, and a circular beam generated by the external laser light source is conditioned and contracted by a plano-convex lens 2 with the diameter of 12mm and then is transmitted to the tail end of the supporting rod cavity along the central axis of the supporting rod cavity, and then is further regulated by a plano-concave cylindrical lens 3 to form a rectangular beam. The plano-concave cylindrical lens 3 is fixedly connected to the laser plane angle adjusting block 7 through glass cement. The laser plane angle adjusting block 7 is a hollow threaded joint with the diameter of 8mm, and the threaded joint has two functions: firstly, the plano-concave cylindrical lens 3 is connected to the penetrating type supporting rod 1, secondly, the rotating threaded joint can drive the plano-concave cylindrical lens 3 to rotate within the range of 0-90 degrees, so that the light emitting direction of a rectangular light beam is adjusted, and the position of the threaded joint is fixed through the fastening pin after the adjustment is finished. A45-degree slope is processed on the supporting table, a reflecting mirror 4 with the diameter of 10mm is mounted on the slope through glass cement bonding, and the mirror surface of the reflecting mirror 4 forms an included angle of 45 degrees with the central axis of the device main body. The reflecting mirror 4 reflects the rectangular beam emitted from the plano-concave cylindrical lens 3 and expands the path distance of about 150mm to form a planar laser light source having a thickness of about 1 mm. In addition, as shown in fig. 2a and 2b, when the plano-concave cylindrical lens 3 is rotationally adjusted within the range of 0-90 degrees through the laser plane angle adjusting block 7, the angle between the laser plane of the plane laser light source and the central axis is randomly adjusted within the range of 0-90 degrees through reflection of the 45-degree reflecting mirror 4.
The penetrating type supporting rod 1 is fixed on a tested aeroengine casing or other airflow pipelines through a mounting wire opening 8 with the diameter of 24mm on the outer surface of the step pipe body II, and the light emitting position of the supporting table is penetrated into the interior of the tested pipelines, so that the assumption that a plane laser light source is generated in a closed airflow channel or pipeline with a shell, such as an aeroengine, is realized.
The external diameter of the high-pressure pipeline 5 is 3mm, the inclined hole is 45 degrees, the outlet of the inclined hole is flush with the mirror surface of the reflecting mirror 4, high-pressure air flow is sprayed out from the inclined hole, a high-speed air film is formed on the surface of the reflecting mirror 4, and the high-speed air film can isolate the mirror surface of the reflecting mirror 4 from water vapor, dust, trace particles and other pollution sources in a flow field to be detected, so that the anti-pollution function is realized, the flow of the high-speed air film is small, and the interference on the flow field to be detected is small.
The outer diameter of the penetrating type supporting rod 1 of the embodiment is 12mm, and the penetrating type supporting rod belongs to a microminiature penetrating type structure. In addition, as the plane expansion of the laser light source is required, the light-emitting position of the penetrating type supporting rod 1 is about 150mm away from the flow field to be detected and is positioned at the downstream of the flow field to be detected, the penetrating type supporting rod 1 has less interference on the flow field to be detected.
Although embodiments of the invention have been disclosed in the foregoing description and illustrated in the drawings, it will be understood by those skilled in the art that the present invention is not limited to the specific details and illustrations of features and steps set forth herein, and that all features of the invention disclosed, or steps of the method or process, except for mutually exclusive features and/or steps, may be combined in any manner without departing from the principles of the invention.
Claims (5)
1. The miniature probing type air film anti-pollution plane laser generating device is characterized by comprising a device main body and a protective air film generating system;
the device body is a three-section step pipe body which is sequentially connected from top to bottom, and the outer diameter of the three-section step pipe body is sequentially reduced from top to bottom; the top end of the step pipe body I is provided with a laser access port (6), and a circular concave cavity is arranged in the step pipe body I; the outer surface of the step pipe body II is provided with a mounting wire opening (8); the step pipe body III sequentially comprises a cylinder section and an extension section from top to bottom, the cylinder section is a penetrating type supporting rod (1), the extension section is provided with a supporting table, and a reflecting mirror (4) is arranged on the supporting table; the inner cavity pipeline of the step pipe body II and the inner cavity pipeline of the step pipe body III are communicated up and down and have the same inner diameter, so that a supporting rod cavity is formed together, and the supporting rod cavity is communicated with the circular concave cavity of the step pipe body I; the central axes of the three-section step pipe body, the round concave cavity and the supporting rod cavity are coincided with the central axis of the device main body; a plano-convex lens (2) is fixedly arranged at the top end of a cavity of the support rod, a laser plane angle adjusting block (7) is embedded at the tail end of the cavity of the support rod, a plano-concave cylindrical lens (3) is arranged in the laser plane angle adjusting block (7), and the laser plane angle adjusting block (7) rotates in a range of 0-90 degrees around the central axis of the device main body to drive the central axis of the plano-concave cylindrical lens (3) to rotate in a range of 0-90 degrees around the central axis of the device main body;
the protective air film generation system comprises an external high-pressure air source and a high-pressure pipeline (5) communicated with the high-pressure air source, wherein the high-pressure pipeline (5) is inserted into a circular concave cavity from the side wall of the step pipe body I, extends out through the pipe wall of the step pipe body II, extends to the supporting table along the outer wall of the step pipe body III and is inserted into an inclined hole of the supporting table, and an inclined hole outlet is positioned above the reflecting mirror (4);
the light source outlet of the external laser light source is connected with the laser access port (6), a round light beam of the external laser light source is conditioned by the plano-convex lens (2) and then is injected into the plano-concave cylindrical lens (3) along the central axis of the cavity of the support rod, a rectangular light beam is formed by the adjustment of the plano-concave cylindrical lens (3), and then a plane laser light source is formed after the reflection and expansion of the reflector (4); the high-pressure air of the high-pressure air source flows through the high-pressure pipeline (5) and is sprayed out from the outlet of the inclined hole, the sprayed high-pressure air forms a high-speed air film, and the high-speed air film flushes the surface of the reflector (4).
2. The micro-miniature penetration type air film anti-pollution planar laser generating device according to claim 1, wherein the pressure range of the high-pressure air source is 0.2-0.5 MPa.
3. The miniature probe-type air film anti-pollution planar laser generating device according to claim 1, wherein the device main body and the high-pressure pipeline (5) are made of stainless steel.
4. The microminiature penetration type air film anti-pollution plane laser generating device according to claim 1, wherein the penetration type supporting rod (1) has an outer diameter ranging from 8mm to 20mm.
5. The miniature probe-type air film anti-pollution planar laser generating device according to claim 1, wherein an included angle between the central axis of the inclined hole and the central axis of the device main body is 45 degrees, and an included angle between the mirror surface of the reflecting mirror (4) and the central axis of the device main body is also 45 degrees.
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