A Coanda jet test device for optical measurement

Abstract

The present invention provides a Coanda jet test device for optical measurement, which belongs to the field of jet circulation control technology. The test device includes a test body, a mounting seat, a test block and two side plates; the test body has a gas flow channel, and the gas flow channel has an inlet end and an outlet end; the mounting seat is detachably mounted on the outlet end, and the mounting seat has a contraction flow channel connected to the gas flow channel, the inner wall of the contraction flow channel is smoothly connected to the inner wall of the gas flow channel, and the opening of the contraction flow channel away from the outlet end is a jet gap; the test block is connected to the mounting seat, located on the side of the mounting seat away from the test body, and the test block is located on either side of the jet gap, and the surface of the test block close to the jet gap is a Coanda surface; the side plates are transparent structures, the two side plates are parallel to each other and clamped on both sides of the test block respectively, and the jet gap is located between the two side plates. The present application observes the flow structure and attachment and separation of the airflow on the Coanda surface by setting a side plate with a transparent structure.

Description

Technical Field

[0001] The invention belongs to the technical field of jet circulation control, and in particular relates to a Coanda jet test device for optical measurement. Background Art

[0002] Jet circulation control technology achieves rudderless flight control by driving compressed air jets to generate virtual rudders. It is a key technology that may bring revolutionary changes to future aircraft design.

[0003] However, when the jet velocity is high, the centrifugal force is greater than the pressure difference caused by the velocity difference, and the jet will separate, resulting in control failure. Therefore, it is necessary to study the complex flow structure and attachment and separation of the jet on the Coanda surface at different jet velocities to provide relevant data for subsequent research. Summary of the invention

[0004] The purpose of this application is to provide a Coanda jet test device for optical measurement to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] An embodiment of the present application provides a Coanda jet test device for optical measurement, including a test body, a mounting seat, a test block and two side panels; the test body has a gas flow channel, and the gas flow channel has an inlet end and an outlet end; the mounting seat can be detachably mounted on the outlet end, and the mounting seat has a contraction flow channel connected to the gas flow channel, the inner wall of the contraction flow channel is smoothly connected to the inner wall of the gas flow channel, and the opening of the contraction flow channel away from the outlet end is a jet gap; the test block is connected to the mounting seat, located on a side of the mounting seat away from the test body, and the test block is located on either side of the jet gap, and the surface of the test block on the side close to the jet gap is a Coanda surface; the side panels are transparent structures, the two side panels are parallel to each other and are respectively clamped on both sides of the test block, and the jet gap is located between the two side panels.

[0007] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0008] In the present application, a test body and a mounting seat are arranged to cooperate to form a channel for airflow to pass through, and a test block is arranged outside the jet gap. The surface of the test block on the side close to the jet gap is a Coanda surface. The operator can observe the flow structure and attachment and separation of the airflow on the Coanda surface through the side panel with a transparent structure, thereby providing relevant test data for subsequent research; and a detachable connection is arranged between the mounting seat and the test body, and the size of the jet gap can be adjusted by replacing different mounting seats, thereby improving the diversity of test data; at the same time, the test block can also be replaced, and the curvature radius of the Coanda surface can be adjusted by replacing the test block, thereby improving the flexibility of use of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 The overall structure of the test device provided in some embodiments of the present application is shown in FIG. Figure 1 ;

[0011] Figure 2 The overall structure of the test device provided in some embodiments of the present application is shown in FIG. Figure 2 ;

[0012] Figure 3 is a cross-sectional view of a test device provided in some embodiments of the present application Figure 1 ;

[0013] Figure 4 This application is about Figure 3 Detailed view of point A;

[0014] Figure 5 It is a schematic diagram of the structure of the test subject provided by some embodiments of the present application;

[0015] Figure 6 is a schematic diagram of the structure of a mounting base and a test block provided in some embodiments of the present application;

[0016] Figure 7 is a schematic diagram of the structure of the side panels provided in some embodiments of the present application;

[0017] Figure 8 is a cross-sectional view of a test device provided in some embodiments of the present application Figure 2 ;

[0018] Fig. 9 This application is about Figure 8 Detail of point B;

[0019] Fig.10 is a cross-sectional view of a test device provided in some embodiments of the present application Figure 3 ;

[0020] Fig.11 is a cross-sectional view of a test device provided in some embodiments of the present application Figure 4 ;

[0021] Fig.12 This application is about Fig.11 Detailed view of point C;

[0022] Fig.13 is a cross-sectional view of a test device provided in some embodiments of the present application Figure 5 .

[0023] In the figure: 100-test body, 110-gas flow channel, 111-inlet end, 112-outlet end, 200-mounting seat, 210-contraction flow channel, 211-jet gap, 220-base, 221-first protrusion, 221a-first slide groove, 222-second protrusion, 222a-second slide groove, 223-mounting channel, 230-upper nozzle, 231-first slider, 240-lower nozzle, 241-second slider, 300-test block, 310-Coanda profile, 320-convex strip, 330-first connecting hole, 340-countersunk hole, 400-side plate, 410-mounting groove, 500-pressure rake. DETAILED DESCRIPTION

[0024] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0025] The present application embodiment provides a Coanda jet test device for optical measurement, referring to Figures 1 to 3 As shown, the test device includes a test body 100, a mounting seat 200, a test block 300 and two side plates 400. The test body 100 has a gas flow channel 110, and the gas flow channel 110 has an inlet end 111 and an outlet end 112. During the test, the gas flow enters the gas flow channel 110 from the inlet end 111 and is output from the outlet end 112. The shape of the interior of the gas flow channel 110 is set according to the actual test requirements.

[0026] The mounting base 200 can be detachably mounted on the outlet end 112. The mounting base 200 has a contraction channel 210, which is connected to the gas channel 110, and the inner wall of the contraction channel 210 is smoothly connected to the inner wall of the gas channel 110. The gas channel 110 and the contraction channel 210 have a smooth transition without steps, which prevents the gas flow from deflecting or turning, reduces the resistance of the gas in the gas channel 110 and the contraction channel 210 during the test, and reduces interference factors. The opening of the contraction channel 210 away from the opening end is a jet gap 211.

[0027] The test block 300 is connected to the mounting base 200 and is located on a side of the mounting base 200 away from the test body 100, and the test block 300 is located on either side of the jet gap 211. The surface of the test block 300 on the side close to the jet gap 211 is a Coanda surface 310. The airflow ejected from the jet gap 211 can be sprayed on the Coanda surface 310, and the complex flow structure and adhesion and separation conditions of the jet on the Coanda surface 310 are tested.

[0028] The side panel 400 is a transparent structure. In the drawings provided in the embodiments of the present application, in order to more clearly show the side panel 400 and the matching relationship between the side panel 400 and other components, the side panel 400 is drawn as a non-transparent structure in the drawings. The two side panels 400 are parallel to each other and are clamped on both sides of the test block 300, respectively, and the jet gap 211 is located between the two side panels 400. The side panel 400 limits the jet to the range corresponding to the Coanda profile 310, which is more conducive to studying and observing the flow state of the jet. At the same time, the two side panels 400 are parallel to each other, so the size of the gap between the two side panels 400 remains unchanged, avoiding the change of the gap affecting the flow of the jet on the Coanda profile 310. The side panel 400 with a transparent structure can reduce the visual obstruction of the operator to observe the jet, and facilitates the operator to directly observe the complex flow structure and attachment and separation of the jet on the Coanda profile 310. In some preferred embodiments, the color rendering effect of the jet can be improved by changing the external light conditions, or by changing the color of the jet, or by other methods, so as to facilitate observation of the jet.

[0029] In the test device provided in the embodiment of the present application, the jet slit 211 is located on either side of the Coanda surface 310. After the airflow is ejected from the jet slit 211, it directly contacts the Coanda surface 310. The operator can observe the flow structure and adhesion and separation of the airflow on the Coanda surface 310 through the transparent side panel 400, thereby providing relevant test data for subsequent research.

[0030] The mounting seat 200 is detachably connected to the test body 100, and the jet gap 211 is set on the mounting seat 200. Therefore, by setting a plurality of different mounting seats 200, different mounting seats 200 have jet gaps 211 of different sizes. By replacing the mounting seat 200, the size of the jet gap 211 can be adjusted to change the test conditions, thereby obtaining more diverse test data. In addition, the size of the contraction channel 210 inside different mounting seats 200 can be set to be different. By replacing different mounting seats 200, the size of the contraction channel 210 can be adjusted, thereby improving the use flexibility of the entire test device. In addition, the test block 300 can also be replaced, and multiple models of test blocks 300 can be set. The curvature radius of the Coanda profile 310 of different test blocks 300 is different. By replacing the test block 300, the curvature radius of the Coanda profile 310 of the test device can be changed to conduct more tests.

[0031] The test device provided in the embodiment of the present application can carry out supersonic Coanda jet tests according to actual test requirements, using one or more of the size of the jet gap 211, the size of the contraction channel 210, and the radius of curvature of the Coanda surface 310 as independent variables.

[0032] In some embodiments, the side panel 400 may be made of optical glass, which has a clear texture and good light transmittance, and is more conducive to the observation of the flow field state.

[0033] In some embodiments of the present application, reference Figure 6 As shown, the mounting base 200 includes a base 220, an upper nozzle 230 and a lower nozzle 240. The base 220 is detachably mounted on the outlet end 112. The upper nozzle 230 and the lower nozzle 240 are located on a side of the base 220 away from the outlet end 112, and both the upper nozzle 230 and the lower nozzle 240 are detachably mounted on the base 220, and the upper nozzle 230 and the lower nozzle 240 are arranged opposite to each other to form a contraction flow channel 210.

[0034] The mounting seat 200 is detachably connected to the test body 100, and the upper nozzle 230 and the lower nozzle 240 are detachably connected to the base 220. When the test device is assembled and used, the mounting seat 200 can be replaced as a whole to adjust the variables, or the variables can be adjusted by replacing the upper nozzle 230 and the lower nozzle 240. The upper nozzle 230 and the lower nozzle 240 are arranged opposite to each other to form a contraction channel 210. By replacing any one of them, the size of the contraction channel 210 and the size of the jet gap 211 can be adjusted.

[0035] By replacing one of the upper nozzle 230 and the lower nozzle 240, the size of the jet gap 211 can be changed. Figure 4 , Fig. 9 and Fig.12As shown, the height of the jet gap 211 is indicated by h; if the upper nozzle 230 and the lower nozzle 240 are replaced at the same time, the relative position of the jet gap 211 and the Coanda surface 310 can be adjusted while the size of the jet gap 211 remains unchanged, so as to obtain more diverse test data.

[0036] The base 220 is generally provided with a through hole, Figure 6 As shown, the through hole is located between the contraction channel 210 and the gas channel 110, and the inner wall of the through hole and the contraction channel 210 and the gas channel 110 are smoothly transitioned without steps.

[0037] In some embodiments of the present application, the base 220 is provided with a first protrusion 221 and a second protrusion 222 which are arranged to protrude away from the outlet end 112. Figure 3 , Figure 8 , Fig.10 , Fig.11 as well as Fig.13 The first protrusion 221 and the second protrusion 222 are disposed opposite to each other and form a mounting channel 223 therebetween. Figure 6 The upper nozzle 230 is installed in the installation channel 223 and fixedly connected to the first protrusion 221 , and the lower nozzle 240 is installed in the installation channel 223 and fixedly connected to the second protrusion 222 .

[0038] The upper nozzle 230 and the lower nozzle 240 are arranged opposite to each other to form a contraction flow channel 210. During the jet test, the airflow has a relatively large impact force on the upper nozzle 230 and the lower nozzle 240. The first protrusion 221 and the second protrusion 222 are arranged to protrude in a direction away from the outlet end 112, and the upper nozzle 230 and the lower nozzle 240 are fixed in a mounting channel 223 formed by the first protrusion 221 and the second protrusion 222 being arranged opposite to each other, which can increase the contact area between the upper nozzle 230 and the first protrusion 221, and the contact area between the lower nozzle 240 and the second protrusion 222, and improve the connection stability of the upper nozzle 230 and the lower nozzle 240.

[0039] In some preferred embodiments, along the flow direction of the airflow, the spacing between the first protrusion 221 and the second protrusion 222 is gradually reduced, that is, the size of the installation channel 223 is gradually reduced. After the upper nozzle 230 and the lower nozzle 240 are fixedly installed, even if the upper nozzle 230 and the lower nozzle 240 are subjected to the impact force of the airflow, the upper nozzle 230 and the lower nozzle 240 can also partially transfer the force to the protrusion connected thereto, reducing the force on the connecting piece between the upper nozzle 230 and the first protrusion 221 and the force on the connecting piece between the lower nozzle 240 and the second protrusion 222, further improving the position stability of the upper nozzle 230 and the lower nozzle 240 during use, and avoiding the displacement of the position of the upper nozzle 230 and the lower nozzle 240 affecting the result of the jet test.

[0040] The two side plates 400 clamped on both sides of the test block 300 also cover the two ends of the installation channel 223 respectively, and the side plates 400 are simultaneously tightly fixed to the first protrusion 221, the second protrusion 222, the upper nozzle 230 and the lower nozzle 240 to block the installation channel 223. Both ends of the installation channel 223 need to be blocked by the side plates 400 to ensure that the airflow entering from the inlet end 111 is finally output through the jet gap 211, so as to avoid the airflow leaking to the external environment through the installation channel 223.

[0041] The side plate 400 is also tightly fixed to the upper nozzle 230 and the lower nozzle 240 to restrict the contraction channel 210, ensuring that the airflow entering from the inlet end 111 of the gas channel 110 can be completely restricted to flow in the contraction channel 210 after flowing to the mounting seat 200, and finally ejected from the jet gap 211. If the side panel 400 is only pressed against the first protrusion 221 and the second protrusion 222, but not against the upper nozzle 230 and the lower nozzle 240, then after the airflow enters the mounting seat 200, it will diffuse from the range of the contraction flow channel 210 to the gap between the upper nozzle 230 and the side panel 400, and the gap between the lower nozzle 240 and the side panel 400, which will affect the flow state of the airflow and affect subsequent observation tests. At the same time, the airflow is also easy to enter the gap between the upper nozzle 230 and the first protrusion 221, and the gap between the lower nozzle 240 and the second protrusion 222, affecting the stability of the overall structure of the test device.

[0042] The first protrusion 221 and the second protrusion 222 may be formed integrally with the base 220, or may be fixed to the base 220 by bolts or other fasteners. The first protrusion 221 and the second protrusion 222 are also tightly fixed to the side plate 400, further stabilizing the positions of the first protrusion 221 and the second protrusion 222, thereby improving the overall operation stability of the device.

[0043] The upper nozzle 230 is fixedly connected to the two side panels 400 and the first protrusion 221 at the same time, and the lower nozzle 240 is fixedly connected to the two side panels 400 and the second protrusion 222 at the same time. The positions of the upper nozzle 230 and the lower nozzle 240 are fixed in multiple directions. The fixed structure is stable and not prone to shaking. When conducting a jet test, it can minimize the interference of the device on the test structure and improve the accuracy of the test data.

[0044] In some specific embodiments, the side plate 400 and the upper nozzle 230, the side plate 400 and the lower nozzle 240, the side plate 400 and the first protrusion 221, and the side plate 400 and the second protrusion 222 are usually fixed with connecting bolts, and a sealing strip is also provided to assist. On the one hand, it is easy to disassemble and assemble, and on the other hand, it can also ensure that the contraction flow channel 210 has good air tightness. Furthermore, the side plate 400 is also pressed against the surface of the base 220 provided with the first protrusion 221 and the second protrusion 222, refer to Figure 1 As shown, the installation stability of the side panel 400 is enhanced.

[0045] The upper nozzle 230 and the lower nozzle 240 can be replaced according to specific test requirements. The jet gap 211 is located between the upper nozzle 230 and the lower nozzle 240. By changing the size of the upper nozzle 230 and the lower nozzle 240, the size of the jet gap 211 can be changed, and the position of the jet gap 211 relative to the Coanda profile 310 can be changed. Figure 4 , Fig. 9 and Fig.12 As shown, upper nozzles 230 and lower nozzles 240 of different sizes can form different jet gaps 211. In addition, the upper nozzles 230 and lower nozzles 240 face each other to form a contraction channel 210, and the size of the contraction channel 210 can be changed by changing the inner wall surface of the upper nozzle 230 and the inner wall surface of the lower nozzle 240.

[0046] The connection between the upper nozzle 230 and the first protrusion 221 is usually also made by a connecting bolt, which passes through the first protrusion 221 and then engages with the upper nozzle 230 by thread. The thread groove of the upper nozzle 230 is arranged on the surface away from the contraction flow channel 210 to ensure the integrity of the inner wall surface of the upper nozzle 230. The lower nozzle 240 and the second protrusion 222 are similar.

[0047] In some embodiments of the present application, the side panel 400 is assembled only after the upper nozzle 230 and the lower nozzle 240 are assembled in place.

[0048] In some preferred embodiments, reference Figure 6As shown, the first protrusion 221 is provided with a first slide groove 221a, and the upper nozzle 230 has a first slider 231, and the first slider 231 is installed in the first slide groove 221a, and the assembly direction of the first slider 231 and the first slide groove 221a is perpendicular to the side plate 400. The two ends of the installation channel 223 formed by the first protrusion 221 and the second protrusion 222 facing each other are open ends, and the line connecting the two open ends is perpendicular to the assembled side plate 400. The first slider 231 is arranged to be assembled into the first slide groove 221a in a direction perpendicular to the side plate 400, so that the first slider 231 is better assembled. The first slider 231 is inserted into the first slide groove 221a, which can improve the connection stability between the upper nozzle 230 and the first protrusion 221.

[0049] refer to Figure 6 As shown, the second protrusion 222 is provided with a second slide groove 222a, and the lower nozzle 240 has a second slider 241, which is installed in the second slide groove 222a, and the assembly direction of the second slider 241 and the second slide groove 222a is perpendicular to the side plate 400. The assembly of the lower nozzle 240 and the second protrusion 222 is similar to the assembly of the upper nozzle 230 and the first protrusion 221. By providing the second slider 241 and the second slide groove 222a to cooperate, the assembly convenience and connection stability between the second protrusion 222 and the lower nozzle 240 can be improved.

[0050] When performing the jet test, under the impact of the airflow, the upper nozzle 230 and the lower nozzle 240 have a tendency to move with the airflow, but due to the connection between the upper nozzle 230 and the side plate 400 and the first protrusion 221, and the connection between the lower nozzle 240 and the side plate 400 and the second protrusion 222, the stability of the position of the upper nozzle 230 and the lower nozzle 240 can be ensured. At the same time, due to the cooperation between the first slider 231 and the first slide groove 221a, and the cooperation between the second slider 241 and the second slide groove 222a, the flow direction of the airflow is perpendicular to the assembly direction of the slider and the slide groove. Therefore, when performing the jet test, the slider and the slide groove limit cooperation can also stabilize the position of the upper nozzle 230 and the lower nozzle 240.

[0051] In some preferred embodiments, the first slide groove 221a is located at the end of the first protrusion 221 close to the base 220, and the second slide groove 222a is located at the end of the second protrusion 222 close to the base 220. The first protrusion 221 and the second protrusion 222 are arranged to protrude in a direction away from the opening end relative to the base 220. The closer to the base 220, the greater the structural strength of the first protrusion 221 and the second protrusion 222, and the more force can be borne. The first slide groove 221a and the second slide groove 222a are arranged close to the base 220, and the limiting cooperation effect between the slider and the slide groove is better in the gas flow direction.

[0052] In some embodiments of the present application, reference Figure 6 and Figure 7 As shown, the test block 300 is provided with a convex strip 320, and the side plate 400 is provided with a mounting groove 410. The convex strip 320 is installed in the mounting groove 410, and the width of the mounting groove 410 is greater than the width of the convex strip 320. According to the curvature radius of the Coanda profile 310 required by the actual test, the corresponding test block 300 is replaced. The size of the test block 300 is different, and the contact position between the test block 300 and the side plate 400 is also different. The width of the mounting groove 410 is set to be wider, even if the size of the test block 300 changes, the convex strip 320 of the test block 300 can still be plugged into the mounting groove 410. The convex strip 320 is plugged into the mounting groove 410, which can reduce the probability of air leakage between the contact part of the test block 300 and the side plate 400, and improve the accuracy of the test results.

[0053] Preferably, the test block 300 is further provided with a plurality of first connection holes 330, Figure 6 As shown, the first connection hole 330 is used to be fixedly matched with the side plate 400. Specifically, the connecting piece passes through the side plate 400 and is plugged into the first connection hole 330 to fix the side plate 400 and the test block 300, and the first connection hole 330 is located on the side of the convex strip 320 away from the Coanda profile 310. After the jet is ejected from the jet gap 211, in the process of flowing on the Coanda profile 310, since the first connection hole 330 is located on the side of the convex strip 320 away from the Coanda profile 310, the influence of the connection between the first connection hole 330 and the side plate 400 on the flow of the jet on the Coanda profile 310 can be reduced as much as possible.

[0054] In some embodiments of the present application, reference Figure 3 , Figure 8 and Fig. 9 As shown, the test block 300 is detachably connected to the lower nozzle 240. Along the arrangement direction of the upper nozzle 230 and the lower nozzle 240, there is a height difference between the Coanda profile 310 and the jet gap 211. Figure 4 and Fig. 9 As shown, the height difference is represented by d. The test block 300 and the lower nozzle 240 are detachably connected, and the height difference can be adjusted by replacing different test blocks 300 or different lower nozzles 240.

[0055] In other embodiments of the present application, reference Fig.11 and Fig.12 As shown, the test block 300 is integrally formed with the lower nozzle 240, and the surface of the lower nozzle 240 close to the jet gap 211 is smoothly connected to the Coanda profile 310. The lower nozzle 240 and the test block 300 are integrally formed, and the inner wall surface of the lower nozzle 240 and the Coanda profile 310 are integrally connected without a gap, which can further improve the accuracy of the test results.

[0056] In the case where the test block 300 and the lower nozzle 240 are detachably connected, if the Coanda profile 310 and the surface of the lower nozzle 240 near the jet gap 211 are smoothly connected, there is a gap between the test block 300 and the lower nozzle 240, which will affect the flow of the jet coming out of the jet gap 211, thereby affecting the test results. Therefore, in the case where the test block 300 and the lower nozzle 240 are detachably connected, there is a height difference between the test block 300 and the lower nozzle 240. Due to the existence of the height difference, the connection gap between the test block 300 and the lower nozzle 240 has little effect on the flow structure of the jet, and the detachable connection can replace different test blocks 300 and flexibly adjust the test conditions.

[0057] In some embodiments of the present application, the test block 300 is equipped with a plurality of pressure sensors, and the pressure sensors are used to measure the gas pressure on the surface of the Coanda profile 310. Figure 4 and Figure 6 As shown, the test block 300 is provided with a plurality of countersunk holes 340, and the pressure sensors are installed in the countersunk holes 340. The plurality of countersunk holes 340 are evenly arranged without interfering with each other, and when the pressure sensors are assembled into the corresponding countersunk holes 340 one by one, the installation position and installation level of the pressure sensors ensure the high frequency response of the pressure sensors.

[0058] The test body 100 is also equipped with a pressure rake 500, referring to Figure 3 and Figure 5 As shown, the gas inlet end of the pressure rake 500 is located in the gas flow channel 110, and is located at the end of the gas flow channel 110 close to the mounting seat 200. In some embodiments, the gas flow channel 110 is a tapered flow channel, and at one end close to the mounting seat 200, the size of the gas flow channel 110 gradually stabilizes to form a stable zone, and the pressure rake 500 is located in the stable zone, ensuring the accuracy of data collection by the pressure rake 500.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A Coanda jet test device for optical measurement, characterized in that: include: A test body (100), the test body (100) having a gas flow channel (110), the gas flow channel (110) having an inlet end (111) and an outlet end (112); a mounting seat (200), the mounting seat (200) being detachably mounted on the outlet end (112), the mounting seat (200) comprising a contraction flow channel (210) communicating with the gas flow channel (110), the inner wall of the contraction flow channel (210) being smoothly connected to the inner wall of the gas flow channel (110), and the opening of the contraction flow channel (210) away from the outlet end (112) being a jet slit (211); a test block (300), the test block (300) being connected to the mounting seat (200) and being located on a side of the mounting seat (200) away from the test body (100), and the test block (300) being located on either side of the jet gap (211), and a surface of the test block (300) on a side close to the jet gap (211) being a Coanda-shaped surface (310); Two side plates (400), the side plates (400) being of a transparent structure, the two side plates (400) being parallel to each other and respectively clamped on two sides of the test block (300), and the jet gap (211) being located between the two side plates (400).

2. A Coanda jet test device for optical measurement according to claim 1, characterized in that: The mounting seat (200) comprises a base (220), an upper nozzle (230) and a lower nozzle (240); the base (220) is detachably mounted on the outlet end (112); the upper nozzle (230) and the lower nozzle (240) are located on a side of the base (220) away from the outlet end (112); and the upper nozzle (230) and the lower nozzle (240) are both detachably mounted on the base (220); the upper nozzle (230) and the lower nozzle (240) are arranged opposite to each other to form the contraction flow channel (210).

3. A Coanda jet test device for optical measurement according to claim 2, characterized in that: The base (220) is provided with a first protrusion (221) and a second protrusion (222) which are arranged to protrude away from the outlet end (112); the first protrusion (221) and the second protrusion (222) are arranged to face each other and form a mounting channel (223) therebetween; the upper nozzle (230) is mounted on the mounting channel (223) and fixedly connected to the first protrusion (221); and the lower nozzle (240) is mounted on the mounting channel (223) and fixedly connected to the second protrusion (222); The two side plates (400) respectively cover the two ends of the installation channel (223), and are simultaneously tightly fixed to the first protruding portion (221), the second protruding portion (222), the upper nozzle (230) and the lower nozzle (240) to block the installation channel (223).

4. A Coanda jet test device for optical measurement according to claim 3, characterized in that: The first protruding portion (221) is provided with a first slide groove (221a), the upper nozzle (230) has a first slider (231), the first slider (231) is installed in the first slide groove (221a), and the assembly direction of the first slider (231) and the first slide groove (221a) is perpendicular to the side plate (400); The second protruding portion (222) is provided with a second slide groove (222a), the lower nozzle (240) has a second slider (241), the second slider (241) is installed in the second slide groove (222a), and the assembly direction of the second slider (241) and the second slide groove (222a) is perpendicular to the side plate (400).

5. A Coanda jet test device for optical measurement according to claim 4, characterized in that: The first sliding groove (221a) is located at an end of the first protruding portion (221) close to the base (220), and the second sliding groove (222a) is located at an end of the second protruding portion (222) close to the base (220).

6. A Coanda jet test device for optical measurement according to claim 3, characterized in that: The test block (300) is provided with a convex strip (320), the side plate (400) is provided with a mounting groove (410), the convex strip (320) is installed in the mounting groove (410), and the width of the mounting groove (410) is greater than the width of the convex strip (320), and the test block (300) is further provided with a plurality of first connection holes (330), the first connection holes (330) are located on a side of the convex strip (320) away from the Coanda profile (310), and the first connection holes (330) are used for fixedly matching with the side plate (400).

7. A Coanda jet test device for optical measurement according to claim 2, characterized in that: The test block (300) is detachably connected to the lower nozzle (240), and along the arrangement direction of the upper nozzle (230) and the lower nozzle (240), there is a height difference between the Coanda profile (310) and the jet gap (211).

8. A Coanda jet test device for optical measurement according to claim 2, characterized in that: The test block (300) and the lower nozzle (240) are integrally formed, and a surface of the lower nozzle (240) close to the jet gap (211) is smoothly connected to the Coanda profile surface (310).

9. A Coanda jet test device for optical measurement according to claim 1, characterized in that: The test block (300) is equipped with a plurality of pressure sensors, and the pressure sensors are used to measure the gas pressure on the surface of the Coanda profile surface (310).

10. A Coanda jet test device for optical measurement according to claim 1, characterized in that: The test body (100) is installed with a pressure rake (500), and the gas inlet end of the pressure rake (500) is located in the gas flow channel (110) and close to the mounting seat (200).

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