CN110907122B - Laser sheet light deflection device and wind tunnel optical measurement experiment system - Google Patents
Laser sheet light deflection device and wind tunnel optical measurement experiment system Download PDFInfo
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- CN110907122B CN110907122B CN201911134680.5A CN201911134680A CN110907122B CN 110907122 B CN110907122 B CN 110907122B CN 201911134680 A CN201911134680 A CN 201911134680A CN 110907122 B CN110907122 B CN 110907122B
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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
- G01M9/02—Wind tunnels
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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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Abstract
The invention discloses a laser sheet light deflection device for wind tunnel experiments, which comprises a box body, wherein an optical glass window is arranged on the side wall of one long edge of the box body, an inlet flange connecting hole and an outlet flange connecting hole are respectively formed in the side walls of two short edges of the box body, and a movable electric sliding door, a rotatable wind shield and a rotatable reflector are sequentially arranged in the box body along the length direction. The reflector is arranged in a downstream flow field of an experimental section of a wind tunnel optical measurement experimental system, namely in the laser sheet light deflection device, external laser sheet light penetrates through the optical glass window and enters the experimental section through the wind shield, the electric sliding door and the inlet flange connecting hole after passing through the reflector, so that a sheet light source is provided for a model in the experimental section, reflection and refraction cannot be formed in optical glass of the experimental section, optical interference in the optical experimental process is greatly reduced, and the measurement precision and effect are improved.
Description
Technical Field
The invention relates to the technical field of wind tunnel optical measurement experiment systems, in particular to a laser sheet light deflection device for a wind tunnel experiment and a wind tunnel optical measurement experiment system.
Background
With the progress of science and technology, the requirements on wind tunnel optical experiments are higher and higher. How to effectively drive laser sheet light into a flow field and flexibly adjust the back pressure of the wind tunnel is a very complicated problem. According to the prior art, a cone-shaped plug is used for blocking a downstream outlet to form back pressure, laser sheet light penetrates through an optical glass window to be driven into a flow field in an experimental section, when a model in the experimental section is of a circular section, the laser sheet light can form refraction and reflection on the circular section, optical experimental measurement is seriously interfered, and shooting precision and effect are reduced.
Therefore, the novel laser sheet light deflection device which has a simple structure, is anti-interference and can adjust back pressure has a very strong practical value.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the novel laser sheet light deflection device and the wind tunnel optical measurement experiment system can provide a sheet light source for a wind tunnel experiment, resist interference and adjust back pressure.
In order to solve the technical problems, the invention is realized by the following technical scheme: a laser sheet light deflection device for wind tunnel experiments comprises a box body, wherein the interior of the box body is a cavity, an optical glass window is arranged on the side wall of one long side of the box body, an inlet flange connecting hole and an outlet flange connecting hole are respectively formed in the side walls of two short sides of the box body, and an electric sliding door, a wind shield and a reflector are sequentially arranged in the box body along the length direction;
the electric sliding door comprises two sliding doors, and the two sliding doors move oppositely along the width direction of the box body and are used for adjusting the back pressure in the wind tunnel system; a space is reserved between the two movable doors and is used for allowing the laser sheet to pass through;
the wind shield comprises two flat plates with variable included angles, and a gap for allowing the laser sheet to pass through is reserved at the included angle of the two flat plates;
the reflector is used for reflecting the laser sheet light transmitted through the optical glass window and then sequentially emitting the laser sheet light through the gap of the wind shield and the distance between the electric sliding doors.
Furthermore, the top of the electric sliding door is fixedly installed on an upper sliding door guide rail of the top wall of the box body in a sliding fit manner, the bottom of the electric sliding door is fixedly installed on a pulley assembly on the bottom plate of the box body in a sliding fit manner, the upper sliding door guide rail and the pulley assembly are installed in a right-to-right manner, and the electric sliding door moves between the upper sliding door guide rail and the pulley assembly.
Furthermore, the upper guide rail of the sliding door is a linear line rail, and the pulley component is a combined piece formed by matching the linear line rail and the limiting pulley.
Furthermore, the bottom fixed connection deep bead of deep bead is revolved the post, the deep bead is revolved the post and is close to the one end of bottom half can be dismantled and be connected with the hand screw, the deep bead is revolved the post and can be clockwise or anticlockwise rotated.
Furthermore, the bottom of the reflector is fixedly connected with a reflector rotating column, one end of the reflector rotating column, which is close to the bottom of the box body, is detachably connected with a hand-screwed screw, and the reflector rotating column can rotate clockwise or anticlockwise.
Further, the inlet flange connecting hole and the outlet flange connecting hole are any one of a circle, an ellipse or a regular polygon.
Further, the diameter of the inlet flange connecting hole is D1, the diameter of the outlet flange connecting hole is D2, and the length of D2 is D1-2D 1;
the total width of the two movable doors when the movable doors are closed is 1.2D 1-2D 1, the horizontal distance L1 between the wind shield rotary column and the inlet flange connecting hole is D1-2D 1, and the horizontal distance L2 between the reflector rotary column and the wind shield rotary column is 0.1D 1-0.5D 1.
Further, a gap of the wind shield is a light path outlet, the maximum distance between the two flat plates is a light path inlet, the width L3 of the light path outlet is 1 mm-5 mm, the length L4 of the flat plates is 0.5D 1-2D 1, and the width L5 of the light path inlet is 0.3D 1-0.6D 1.
Furthermore, the triple prism includes two mutually perpendicular's printing opacity faces and connects two the plane of reflection of printing opacity, forms the enclosure space.
The invention also provides a wind tunnel optical measurement experiment system which comprises a wind tunnel air inlet device, an experiment section, a wind tunnel exhaust device and the laser sheet light deflection device which can be used for the wind tunnel experiment.
Compared with the prior art, the invention has the advantages that:
the reflector is arranged in a downstream flow field of an experimental section of a wind tunnel optical measurement experimental system, namely, in the laser sheet light deflection device, external laser sheet light penetrates through an optical glass window and enters the experimental section through a wind shield, an electric sliding door and an inlet flange connecting hole after passing through the reflector, so that a sheet light source is provided for a model in the experimental section, reflection and refraction cannot be formed in the optical glass of the experimental section even when the model with a circular section is shot, optical interference in the optical experimental process is greatly reduced, and the measurement precision and effect are improved;
two, through electronic sliding door and sliding door upper guideway, loose pulley assembly mutually support, realize the accurate regulation of electronic sliding door aperture to back pressure in the wind-tunnel optical measurement experimental system can not take place the phenomenon of jamming simultaneously according to the experiment needs change, makes the experimental conditions more accurate adjustable, has improved the simulation authenticity of wind-tunnel experiment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is an overall structure diagram of a laser sheet light deflection device for wind tunnel experiments according to the present invention;
FIG. 2 is a schematic view of the assembly of a wind deflector with a wind deflector bollard;
FIG. 3 is a schematic view of the mirror and mirror post assembly;
1. a sliding door upper guide rail; 2. an inlet flange connection hole; 3. a sheave assembly; 4. an electric sliding door; 5. a wind deflector; 6. a wind deflector spin post; 7. a mirror; 8. rotating the reflector; 9. an optical glass window; 10. a box body; 11. an outlet flange connection hole; 12. screwing the screw by hand; 51. an optical path outlet; 52. an optical path inlet; 71. a reflective surface; 72. a light-transmitting surface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example one
The laser sheet light deflection device for the wind tunnel experiment as shown in fig. 1 comprises a box body 10 with a cavity inside, wherein an optical glass window 9 is installed on one long side wall of the box body 10, in this embodiment, the rear side wall of the box body 10, an inlet flange connecting hole 2 and an outlet flange connecting hole 11 are respectively formed on two short side walls, the outer sides of the inlet flange connecting hole 2 and the outlet flange connecting hole 11 are respectively and fixedly connected with an inlet flange and an outlet flange, the inlet flange is connected to an experiment section, and the outlet flange is connected to a wind tunnel exhaust device; a movable electric sliding door 4, a rotatable wind shield 5 and a rotatable reflector 7 are sequentially arranged in the box body 10 along the length direction, and preferably, the movable electric sliding door, the rotatable wind shield and the rotatable reflector are arranged at the center of the box body 10 along the width direction; in this embodiment, the reflector is installed in a downstream flow field of an experimental section of a wind tunnel optical measurement experimental system, that is, in the laser sheet light deflection device, external laser sheet light penetrates through the optical glass window 9, passes through the reflector 7, and then enters the experimental section through the wind shield 5, the electric sliding door 4 and the inlet flange connecting hole 2, so that a sheet light source is provided for a model in the experimental section, and even if the model with a circular section is shot, reflection and refraction cannot be formed in the optical glass in the experimental section.
Preferably, the electric sliding door 4 comprises two moving doors, and the two moving doors move oppositely along the width direction of the box body 10 and are used for adjusting the magnitude of back pressure in the wind tunnel system; a space is reserved between the two movable doors and is used for allowing the laser sheet to pass through; the top of the electric sliding door 4 is fixedly mounted on an upper sliding door guide rail 1 of the top wall of the box body 10 in a sliding fit manner, the bottom of the electric sliding door 4 is fixedly mounted on a pulley component 3 of a bottom plate of the box body 10 in a sliding fit manner, the upper sliding door guide rail 1 and the pulley component 3 are mounted in a right-facing manner, the electric sliding door 4 moves between the upper sliding door guide rail 1 and the pulley component 3, more specifically, the upper sliding door guide rail 1 is a linear rail, and the pulley component 3 is an assembly of the linear rail and a limiting pulley in a matching manner; in order to realize the accurate removal of electronic sliding door 4, at the bottom or the side installation servo motor of two sliding doors, cooperation lead screw or hold-in range module realize two sliding doors simultaneously and move in opposite directions, if remove or keep away from this central line simultaneously to the central line of 1 width direction of box and remove simultaneously, thereby adjust the size of distance between two sliding doors, and then change the back pressure in the wind-tunnel optical measurement experimental system according to the experiment needs, can not take place the phenomenon of jamming moreover.
As shown in fig. 2, the wind deflector 5 comprises two flat plates with a variable included angle, and a gap for passing the laser sheet is reserved at the included angle of the two flat plates; the design that the included angle of two flat boards is adjustable is convenient for adjust the size of the included angle between two flat boards according to the wind-force size in the wind tunnel experiment system to minimize the influence that speculum 7 received wind-force, improve the stability of laser piece light.
In order to realize the rotation function of deep bead 5 the bottom fixed connection deep bead of deep bead 5 is revolved post 6, and the deep bead is revolved post 6 and can be clockwise or anticlockwise rotated, and the bottom of post 6 is revolved at the deep bead still detachable be connected with hand screw 12, when needs angle regulation, only need through manual loosen hand screw 12, rotate the deep bead revolve post 6 again behind the required position screw up hand screw 12 can, simple structure, convenient operation.
As shown in fig. 3, the reflecting mirror 7 includes a triangular prism for reflecting the laser sheet light transmitted through the optical glass window 9 and passing through the wind guard 5 and the power sliding door 4 in sequence; more specifically, the triangular prism includes two light-transmitting surfaces 72 perpendicular to each other and a reflecting surface 71 connecting the two light-transmitting surfaces 72.
In order to realize the rotating function of the reflector 7, a reflector rotary column 8 is fixedly connected to the bottom of the reflector 7, the reflector rotary column 8 can rotate clockwise or anticlockwise, a hand screw 12 is also detachably connected to the bottom of the reflector rotary column 8, and the adjusting mode is the same as that of the wind shield 5.
Preferably, the bottoms of the wind shield rotary column 6 and the reflector rotary column 8 can be connected with a rotating motor through a coupler, so that electric rotation is realized, the adjustment is more intelligent, and the precision is higher.
Preferably, the inlet flange connecting hole 2 and the outlet flange connecting hole 11 are any one of circular, oval or regular polygon, and holes can be selectively opened according to the types of the connecting flanges of the components of the wind tunnel experiment system.
Preferably, the diameter of the inlet flange connecting hole 2 is D1, the diameter of the outlet flange connecting hole 11 is D2, and the length of D2 is D1-2D 1, so that the wind can be smoothly discharged from the outlet flange connecting hole 11; two total width when the floating gate is closed is 1.2D1 ~ 2D1, ensures to cover completely when two floating gates are being close the closed condition import flange connecting hole 2, the deep bead revolves post 6 and is D1 ~ 2D1 with the horizontal distance L1 of import flange connecting hole 2, ensures that deep bead 5 can not influence the wind pressure in the wind tunnel system, the horizontal distance L2 of reflector spiral post 8 and deep bead spiral post 6 is 0.1D1 ~ 0.5D1, reduces the influence to speculum 7 as far as possible under the condition that does not influence the light path.
Preferably, the gap of the wind shield 5 is a light path outlet 51, the maximum distance between the two flat plates is a light path inlet 52, the width L3 of the light path outlet 51 is 1 mm-5 mm, the width L3 can be flexibly adjusted according to the type of laser light, the length L4 of the flat plates is 0.5D 1-2D 1, and the width L5 of the light path inlet 52 is 0.3D 1-0.6D 1, so that the reflector 7 can be completely shielded under the condition that the wind pressure is not influenced as much as possible.
The laser sheet light deflection device for the wind tunnel experiment has the specific using process that: before the experiment begins, firstly, a hand-screw 12 is loosened, a wind shield rotary column 6 and a reflector rotary column 8 are rotated to rotate a wind shield 5 and a reflector 7 to required positions respectively, the size of an included angle between two flat plates in the wind shield 5 and the distance between two movable doors of an electric movable door 4 are adjusted according to the size of wind power and the type of laser light, and the wind shield rotary column and the reflector rotary column are connected to an experiment section and a wind tunnel exhaust device respectively through an inlet flange and an outlet flange.
Starting an experiment, laser emits laser sheet light, the laser sheet light is emitted into the box body 10 from the optical glass window 9 on the rear side wall of the box body 10, is reflected by the reflecting mirror 7, sequentially penetrates through a gap of the wind shield 5 and a gap between the electric sliding doors 4 and is shot to an experiment section, a sheet light source is provided for a time shooting model, and in the experiment process, the gap between the electric sliding doors 4 can be adjusted according to needs, so that the back pressure in the wind tunnel system is adjusted.
Example two
The laser sheet light deflection device for wind tunnel experiments as shown in the attached figures 1-3 comprises a box body 10 with a cavity inside, wherein an optical glass window 9 is installed on the side wall of one long side of the box body 10, and an inlet flange connecting hole 2 and an outlet flange connecting hole 11 are respectively formed on the side walls of two short sides of the box body; the difference between the first embodiment and the second embodiment is that the total width of the two movable doors when the movable doors are closed is 1.2D1, the horizontal distance L1 between the wind deflector stud 6 and the inlet flange connecting hole 2 is D1, the horizontal distance L2 between the mirror stud 8 and the wind deflector stud 6 is 0.1D1, the width L3 of the optical path outlet 51 is 1mm, the length L4 of the flat plate is 0.5D1, the width L5 of the optical path inlet 52 is 0.3D1, and the use process is the same as that of the first embodiment in sequence.
EXAMPLE III
The laser sheet light deflection device for wind tunnel experiments as shown in the attached figures 1-3 comprises a box body 10 with a cavity inside, wherein an optical glass window 9 is installed on the side wall of one long side of the box body 10, and an inlet flange connecting hole 2 and an outlet flange connecting hole 11 are respectively formed on the side walls of two short sides of the box body; the difference between the first embodiment and the second embodiment is that the total width of the two movable doors when the movable doors are closed is 2D1, the horizontal distance L1 between the wind deflector stud 6 and the inlet flange connecting hole 2 is 2D1, the horizontal distance L2 between the mirror stud 8 and the wind deflector stud 6 is 0.5D1, the width L3 of the optical path outlet 51 is 5mm, the length L4 of the flat plate is 2D1, the width L5 of the optical path inlet 52 is 0.6D1, and the use process and the principle are the same as those of the first embodiment.
Example four
The laser sheet light deflection device for wind tunnel experiments as shown in the attached figures 1-3 comprises a box body 10 with a cavity inside, wherein an optical glass window 9 is installed on the side wall of one long side of the box body 10, and an inlet flange connecting hole 2 and an outlet flange connecting hole 11 are respectively formed on the side walls of two short sides of the box body; the difference between the first embodiment and the second embodiment is that the total width of the two movable doors when the movable doors are closed is 1.6D1, the horizontal distance L1 between the wind shield rotary column 6 and the inlet flange connecting hole 2 is 1.5D1, the horizontal distance L2 between the mirror rotary column 8 and the wind shield rotary column 6 is 0.3D1, the width L3 of the optical path outlet 51 is 3mm, the length L4 of the flat plate is 1.2D1, the width L5 of the optical path inlet 52 is 0.5D1, and the use process is the same as the principle of the first embodiment.
EXAMPLE five
A wind tunnel optical measurement experiment system comprises a wind tunnel air inlet device, an experiment section, a wind tunnel exhaust device and a laser sheet light deflection device which can be used for wind tunnel experiments according to any one of the first embodiment to the fourth embodiment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a laser piece light deflection device that can be used to wind tunnel experiment, includes that inside is box (10) of cavity, its characterized in that: an optical glass window (9) is installed on the side wall of one long side of the box body (10), an inlet flange connecting hole (2) and an outlet flange connecting hole (11) are respectively formed in the side walls of the two short sides, and an electric sliding door (4), a wind shield (5) and a reflector (7) are sequentially installed in the box body (10) along the length direction;
the electric sliding door (4) comprises two movable doors, and the two movable doors move oppositely along the width direction of the box body (10) and are used for adjusting the back pressure in the wind tunnel system; a space is reserved between the two movable doors and is used for allowing the laser sheet to pass through;
the wind shield (5) comprises two flat plates with variable included angles, and a gap for allowing the laser sheet to pass through is reserved at the included angle of the two flat plates;
the reflector (7) is used for reflecting the laser sheet light transmitted through the optical glass window (9) and then sequentially emitting the laser sheet light through the gap of the wind shield (5) and the distance between the electric sliding doors (4);
wherein: the top of the electric sliding door (4) is fixedly arranged on an upper sliding door guide rail (1) on the top wall of the box body (10) in a sliding fit manner, the bottom of the electric sliding door (4) is fixedly arranged on a pulley component (3) on a bottom plate of the box body (10) in a sliding fit manner, the upper sliding door guide rail (1) and the pulley component (3) are installed in a right-to-side manner, and the electric sliding door (4) moves between the upper sliding door guide rail (1) and the pulley component (3);
servo motors are arranged at the bottoms or the side edges of the two movable doors, and the two movable doors can move simultaneously and oppositely by matching with a screw rod or a synchronous belt module;
the upper guide rail (1) of the sliding door is a linear rail, and the pulley component (3) is a combined piece formed by matching the linear rail and a limiting pulley.
2. The laser sheet light deflection device for wind tunnel experiments according to claim 1, characterized in that: the bottom fixed connection deep bead of deep bead (5) is revolved post (6), deep bead is revolved post (6) and is close to the one end of box (10) bottom can be dismantled and be connected with hand screw (12), but deep bead revolves post (6) clockwise or anticlockwise rotation.
3. The laser sheet light deflection device for wind tunnel experiments according to claim 2, characterized in that: the bottom fixed connection reflector of speculum (7) revolves post (8), reflector revolves post (8) is close to the one end of box (10) bottom can be dismantled and is connected with hand screw (12), reflector revolves post (8) and can clockwise or anticlockwise rotate.
4. The laser sheet light deflection device for wind tunnel experiments according to claim 1, characterized in that: the inlet flange connecting hole (2) and the outlet flange connecting hole (11) are any one of circular, oval or regular polygon.
5. The laser sheet light deflection device for wind tunnel experiments according to claim 3, wherein: setting the diameter of the inlet flange connecting hole (2) to be D1, the diameter of the outlet flange connecting hole (11) to be D2, and D2 is more than or equal to D1 and less than or equal to 2D 1;
the total width of the two movable doors when the movable doors are closed is 1.2D 1-2D 1, the horizontal distance between the wind shield rotary column (6) and the inlet flange connecting hole (2) is 1D 1-2D 1, and the horizontal distance between the reflector rotary column (8) and the wind shield rotary column (6) is 0.1D 1-0.5D 1.
6. The laser sheet light deflection device for wind tunnel experiments according to claim 3, wherein: a gap of the wind shield (5) is a light path outlet (51), the maximum distance between the two flat plates is a light path inlet (52), the width of the light path outlet (51) is 1mm or more and L3 or more and 5mm or less, the length of the flat plate is 0.5D1 or more and L4 or more and 2D1 or less, and the width of the light path inlet (52) is 0.3D1 or more and L5 or more and 0.6D1 or less.
7. The laser sheet light deflection device for wind tunnel experiments according to any one of claims 1 to 6, wherein: the reflector (7) is a triangular prism reflector and comprises two light transmission surfaces (72) which are perpendicular to each other and a reflecting surface (71) which is connected with the two light transmission surfaces (72).
8. A wind tunnel optical measurement experiment system is characterized in that: the laser sheet light deflection device comprises a wind tunnel air inlet device, an experiment section, a wind tunnel exhaust device and the laser sheet light deflection device which can be used for wind tunnel experiments and is as claimed in any one of claims 1 to 7.
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| CN115824566A (en) * | 2023-02-21 | 2023-03-21 | 中国空气动力研究与发展中心空天技术研究所 | Plane cascade wind tunnel PIV experiment light path arrangement method |
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| CN110907122A (en) | 2020-03-24 |
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