A multi-azimuth sealed optical visualization spray atomization characteristic testing device

Abstract

The present application belongs to the technical field of spray atomization experiment and flow optical diagnosis, and discloses a multi-directional sealed optical visualization spray atomization characteristic testing device. The testing device comprises a testing main body, a gas guide ring, an air inlet cylinder, a window mounting seat and a window assembly. The testing main body has a test cavity and a plurality of observation cylinders arranged along the circumference of the test cavity. The observation cylinders are provided with blow holes arranged along the circumference thereof. The gas guide ring is installed in the test cavity, and the air inlet cylinder is arranged in the gas guide ring. The nozzle is installed in the air inlet cylinder. The window mounting seat is installed in the observation cylinder, and the window mounting seat is provided with a blow channel connected with the blow hole. The blow channel has an air inlet pipe and an air outlet pipe. The window assembly is sealingly connected to the window mounting seat. The testing device is provided with a multi-optical observation window structure and a window blow anti-pollution structure, and multi-directional visualization measurement of the stable spray atomization process is realized.

Description

Technical Field

[0001] This invention relates to the field of spray atomization experiments and flow optical diagnostics, and in particular to a multi-directional sealed optical visualization spray atomization characteristic testing device. Background Technology

[0002] As the "heart" of an aircraft, the performance of the aero-engine directly affects the aircraft's thrust-to-weight ratio, range, and economic indicators. With the aviation industry moving towards higher temperatures and lower emissions, the combustion chamber must achieve efficient and stable combustion under extreme aerodynamic and thermal conditions. Fuel atomization, as a crucial step at the combustion chamber inlet, directly impacts flame stability, combustion efficiency, and pollutant emissions. Therefore, in-depth research into the formation and atomization mechanism of fuel spray is of great significance for improving combustion efficiency and reducing pollutant emissions.

[0003] After fuel is atomized by the nozzle, the droplet size, spatial distribution, and evaporation characteristics directly affect flame stability and the quality of the outlet temperature distribution. High-quality atomization can significantly shorten the flame nucleus formation time, widen the combustion boundary, and suppress the formation of local high-temperature zones, thereby reducing the generation of emissions such as nitrogen oxides. As the inlet pressure and temperature of the combustion chamber increase, the nozzle needs to maintain excellent atomization performance under high-pressure conditions, and the spray atomization process needs to be accurately observed and analyzed. This places higher demands on in-depth research into atomization mechanisms and experimental measurement techniques.

[0004] Currently, optical visualization diagnostic techniques such as high-speed shadowing, planar laser-induced fluorescence (PLIF), and particle image velocimetry (PIV) are widely used in atomization experimental research. However, existing spray visualization experimental devices still have some shortcomings in their structural design: First, some experimental devices have a limited number of observation windows, making it difficult to achieve multi-directional optical measurements and restricting the realization of simultaneous multi-parameter measurements. Second, fuel droplets easily adhere to the surface of the optical observation window during injection and diffusion, forming liquid films or contaminants, especially in long-term spray experiments or under high-pressure conditions, where window contamination problems are more pronounced. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-directional sealed optical visualization spray atomization characteristic testing device. This testing device achieves stable multi-directional visualization measurement of the spray atomization process by setting up a multi-optical observation window structure and a window purging and anti-pollution structure.

[0006] To achieve this objective, the present invention adopts the following technical solution: This invention discloses a multi-directional sealed optical visualization spray atomization characteristic testing device, comprising: a testing body having a test chamber and a plurality of observation tubes spaced circumferentially along the test chamber, the observation tubes being provided with purge holes spaced circumferentially thereon; a guide ring installed in the test chamber; an air inlet cylinder passing through the guide ring, the nozzle being installed inside the air inlet cylinder; a window mounting base installed in the observation tubes, the window mounting base being provided with a purge channel connected to the purge holes, the purge channel having an air inlet pipe and an air outlet pipe; and a window assembly sealed to the window mounting base.

[0007] In some embodiments, the air inlet includes a first cylinder, a first flange, and a sealing plate. The first flange and the sealing plate are respectively connected to both ends of the first cylinder. The sealing plate has a first central hole. A limiting mounting plate is detachably mounted on the sealing plate. The limiting mounting plate has a second central hole for mounting the nozzle.

[0008] In some specific embodiments, the sealing plate is provided with a plurality of first mounting holes spaced apart circumferentially along the first central hole, and the limiting mounting plate is provided with a plurality of second mounting holes spaced apart circumferentially along the second central hole; the first mounting member passes through the second mounting hole and is connected to the first mounting hole to fix the limiting mounting plate to the sealing plate.

[0009] In some specific embodiments, the air guide ring includes a second cylinder and a second flange connected to the second cylinder. The second flange is provided with a mounting groove, and the first flange is fixed to the mounting groove.

[0010] In some more specific embodiments, the bottom wall of the mounting groove is provided with a plurality of third mounting holes spaced apart along the circumference of the second cylinder, and the first flange is provided with a plurality of fourth mounting holes spaced apart along its circumference, with the plurality of third mounting holes and the plurality of fourth mounting holes corresponding one to one; the second mounting member passes through the fourth mounting holes and connects with the third mounting holes to install the air inlet cylinder onto the air guide ring.

[0011] In some embodiments, the window assembly includes: a window mounting base, one end of which is connected to the window mounting base, the window mounting base having a window fixing cavity; a window body, the window body being installed in the window fixing cavity; and a window cover plate, the window cover plate being installed on one end of the window mounting base away from the window mounting base.

[0012] In some specific embodiments, the end of the window mounting base facing the window fixing base is provided with a first annular groove, and one end of the window fixing base is fitted into the first annular groove and sealed by sealant.

[0013] In some specific embodiments, the end of the window cover facing the window mounting base is provided with a second annular groove, and the other end of the window mounting base is fitted into the second annular groove and sealed with sealant.

[0014] In some specific embodiments, the window fixing cavity includes a first cavity and a second cavity, the diameter of the first cavity is larger than that of the second cavity, the first cavity is oriented toward the adjacent window mounting base, the window body is mounted in the first cavity, and a sealing ring is provided between the window body and the inner wall of the first cavity.

[0015] In some embodiments, the inner wall of the viewing window mounting base has a recessed annular groove, and the inner wall of the viewing window mounting base abuts against the outer wall of the observation tube to close the opening of the annular groove to form the purging channel.

[0016] The beneficial effects of the multi-directional sealed optical visualization spray atomization characteristic testing device of the present invention are as follows: Because the testing body is equipped with multiple observation tubes spaced circumferentially along the test chamber, each observation tube contains a viewing window assembly, enabling multi-directional optical visualization observation of the spray area. Multiple viewing window assemblies can be used to conduct various iso-optical measurements, thereby more comprehensively acquiring the spray atomization structure and its evolution characteristics, improving the integrity and accuracy of spray measurements. Since the nozzle is installed inside the air inlet cylinder, and a guide ring is provided on the outside of the air inlet cylinder, during the test, some gas flows along the inner wall of the guide ring to form a protective airflow, performing primary purging of the viewing window assembly. The viewing window mounting base is equipped with a purging channel connected to the purging hole, which has an inlet pipe and an outlet pipe, enabling secondary purging of the spray during operation, ensuring the cleanliness of the viewing window assembly and improving the reliability of optical measurements.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the multi-directional sealed optical visualization spray atomization characteristic testing device according to an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the multi-directional sealed optical visualization spray atomization characteristic testing device according to an embodiment of the present invention; Figure 3This is a cross-sectional schematic diagram of the multi-directional sealed optical visualization spray atomization characteristic testing device according to an embodiment of the present invention; Figure 4 yes Figure 3 A partially enlarged schematic diagram of the structure shown.

[0019] Figure label: 100. Test body; 101. Test chamber; 102. Observation tube; 103. Purge port; 200, Air guide ring; 210, Second cylinder; 220, Second flange; 221, Mounting groove; 222, Third mounting hole; 300, Air inlet; 310, First cylinder body; 320, First flange; 321, Fourth mounting hole; 330, Sealing plate; 331, First center hole; 332, First mounting hole; 400. Window mounting bracket; 401. Purge channel; 402. Air inlet pipe; 403. Air outlet pipe; 404. First annular groove; 500, Window assembly; 510, Window mounting base; 511, Window mounting cavity; 5111, First cavity; 5112, Second cavity; 520, Window body; 530, Window cover plate; 531, Second annular groove; 600, Limiting mounting plate; 610, Second center hole; 620, Second mounting hole; 700. Sensor mounting bracket; 800. Fixed flange. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] This invention discloses a multi-directional sealed optical visualization spray atomization characteristic testing device (hereinafter referred to as the testing device for convenience), referenced Figures 1-2 As shown, the testing device includes a testing body 100, an air guide ring 200, an air inlet cylinder 300, a viewing window mounting base 400, and a viewing window assembly 500. The testing body 100 has a test chamber 101 and a plurality of observation cylinders 102 arranged circumferentially around the test chamber 101. Each observation cylinder 102 has a purge hole 103 arranged circumferentially around it. The air guide ring 200 is installed in the test chamber 101. The air inlet cylinder 300 passes through the air guide ring 200, and a nozzle is installed inside the air inlet cylinder 300. The viewing window mounting base 400 is installed in the observation cylinders 102. The viewing window mounting base 400 has a purge channel 401 connected to the purge hole 103. The purge channel 401 has an air inlet pipe 402 and an air outlet pipe 403. The viewing window assembly 500 is sealed and connected to the viewing window mounting base 400. Understandably, since the test body 100 is equipped with multiple observation tubes 102 spaced circumferentially along the test chamber 101, and each observation tube 102 contains a viewing window assembly 500, multi-directional optical visualization observation of the spray area can be achieved. Multiple viewing window assemblies 500 can be used to conduct various iso-optical measurements, thereby more comprehensively acquiring the spray atomization structure and its evolution characteristics, and improving the integrity and accuracy of spray measurements. Since the nozzle is installed inside the air inlet cylinder 300, and an air guide ring 200 is provided on the outside of the air inlet cylinder 300, during the test, some gas flows along the inner wall of the air guide ring 200 to form a protective airflow, performing primary purging of the viewing window assembly 500. The viewing window mounting base 400 is equipped with a purging channel 401 connected to the purging hole 103. The purging channel 401 has an air inlet pipe 402 and an air outlet pipe 403, which can perform secondary purging of the spray during operation, ensuring the cleanliness of the viewing window assembly 500 and improving the reliability of optical measurements.

[0024] Optionally, in this embodiment, the test chamber 101 is cylindrical and vertically arranged. Four observation tubes 102 are provided on the test body 100, three of which have a diameter of 150 mm and one has a diameter of 100 mm. Three large-diameter viewing window components 500 are used for Phase Doppler Particle Analyzer (PDPA) measurements. Simultaneously, two vertically aligned viewing window components 500 can be used for PIV, PLIF, and other measurements. Two coaxial viewing window components 500 can be used for high-speed photography, schlieren, and laser particle size analysis. This multi-viewing window component design allows for more comprehensive acquisition of spray atomization characteristics, improving the completeness and accuracy of the experimental measurements.

[0025] Optionally, the observation tube 102 has 30 purge holes 103, which can form a stable gas purge layer on the surface of the window assembly 500, and purge the fuel mist a second time to ensure that the window assembly 500 is free from contamination during the test.

[0026] Optionally, the material of the test body 100 is an S30408 ​​forging.

[0027] Optionally, the test body 100 is also provided with multiple sensor mounting bases 700 for mounting sensors that extend into the test chamber 101.

[0028] Optionally, the test body 100 is provided with fixed flanges 800 at both ends, which are used for sealing connection with external pipelines.

[0029] Optional, see reference Figure 3 As shown, the air inlet cylinder 300 includes a first cylinder 310, a first flange 320, and a sealing plate 330. The first flange 320 and the sealing plate 330 are respectively connected to both ends of the first cylinder 310. The sealing plate 330 has a first central hole 331, and a limiting mounting plate 600 is detachably mounted on the sealing plate 330. The limiting mounting plate 600 is used to mount the second central hole 610 of the nozzle. Existing test devices have poor nozzle mounting structure versatility; replacing different nozzle models requires redesigning the tooling, resulting in low experimental efficiency. However, in the test device disclosed in this invention, since a sealing plate 330 is provided at one end of the air inlet cylinder 300, and a limiting mounting plate 600 is detachably mounted on the sealing plate 330, different limiting mounting plates 600 can be used to adapt to the installation requirements of different types of nozzles, enabling comparative tests of the atomization characteristics of different nozzle structures. In addition, a first flange 320 is provided at the other end of the first cylinder 310. The first flange 320 is used to connect with the air guide ring 200, which can facilitate the detachable connection between the air inlet cylinder 300 and the air guide ring 200.

[0030] Alternatively, the first flange 320 is fitted onto the first cylinder 310 and welded to the outer peripheral wall of the first cylinder 310. This ensures the stability and sealing of the connection between the first flange 320 and the first cylinder 310.

[0031] Alternatively, the first cylinder 310 is fitted onto the sealing plate 330, and the sealing plate 330 is welded to the inner wall of the first cylinder 310. This ensures the stability and sealing of the connection between the first flange 320 and the sealing plate 330.

[0032] Optionally, the sealing plate 330 is provided with a plurality of first mounting holes 332 circumferentially spaced along the first central hole 331, and the limiting mounting plate 600 is provided with a plurality of second mounting holes 620 circumferentially spaced along the second central hole 610; the first mounting member passes through the second mounting hole 620 and connects with the first mounting hole 332 to fix the limiting mounting plate 600 to the sealing plate 330. It is understood that in the actual assembly process, it is only necessary to attach the limiting mounting plate 600 to the sealing plate 330, ensuring that the plurality of first mounting holes 332 and the plurality of second mounting holes 620 are aligned one by one, and then pass the first mounting member through the second mounting hole 620 and connect with the first mounting hole 332 to fix the limiting mounting plate 600 to the sealing plate 330. This connection method can conveniently and stably fix the limiting mounting plate 600 to the sealing plate 330, thereby indirectly ensuring the installation stability of the nozzle. In this embodiment, the first mounting component is a screw, the second mounting hole 620 is a smooth hole, and the first mounting hole 332 is a threaded hole. Of course, in other embodiments of the invention, the first mounting component can also be other connecting components such as pins, depending on actual needs.

[0033] It should be noted that the limiting mounting plate 600 can also be detachably connected to the sealing plate 330 via a snap-fit ​​structure, and is not limited to the connection method of the first mounting component mentioned above.

[0034] Optionally, the air guide ring 200 includes a second cylinder 210 and a second flange 220 connected to the second cylinder 210. The second flange 220 has a mounting groove 221, and a first flange 320 is fixed to the mounting groove 221. It is understood that in the actual installation process, it is necessary to ensure that the air guide ring 200 and the air inlet cylinder 300 are coaxially arranged. The mounting groove 221 on the second flange 220 and the first flange 320 fixed to the mounting groove 221 facilitate the positioning of the air inlet cylinder 300, thereby ensuring that the air guide ring 200 and the air inlet cylinder 300 are coaxially arranged.

[0035] Alternatively, the first cylindrical body 310 is fitted onto the first flange 320 and welded to the outer peripheral wall of the first flange 320. This ensures the connection stability and sealing performance between the second flange 220 and the second cylindrical body 210.

[0036] Optionally, the bottom wall of the mounting groove 221 is provided with a plurality of third mounting holes 222 spaced apart circumferentially along the second cylinder 210, and the first flange 320 is provided with a plurality of fourth mounting holes 321 spaced apart circumferentially therebetween. The plurality of third mounting holes 222 and the plurality of fourth mounting holes 321 are arranged one-to-one. The second mounting component passes through the fourth mounting hole 321 and connects with the third mounting hole 222 to install the air inlet cylinder 300 onto the air guide ring 200. In the actual assembly process, it is only necessary to insert the first cylinder 310 into the second cylinder 210 so that the first flange 320 fits against the second flange 220, and then ensure that the plurality of third mounting holes 222 and the plurality of fourth mounting holes 321 are aligned one-to-one. Then, the second mounting component passes through the fourth mounting hole 321 and connects with the third mounting hole 222 to install the air inlet cylinder 300 onto the air guide ring 200. This connection method can conveniently and stably fix the air inlet cylinder 300 onto the air guide ring 200, thereby indirectly ensuring the installation stability of the nozzle. In this embodiment, the second mounting component is a screw, the fourth mounting hole 321 is a smooth hole, and the third mounting hole 222 is a threaded hole. Of course, in other embodiments of the invention, the second mounting component can also be selected from other connecting components such as pins, depending on actual needs. It should be further noted that the air inlet cylinder 300 can also be directly welded to the air guide ring 200, and is not limited to the above-described method of fixing the second mounting component.

[0037] Alternatively, the second cylinder 210 may be interference-fitted with the test body 100, or fixed by adhesive bonding with a sealing gasket.

[0038] Optional, see reference Figures 3-4 As shown, the window assembly 500 includes a window mounting base 510, a window body 520, and a window cover plate 530. One end of the window mounting base 510 is connected to the window mounting base 400. The window mounting base 510 has a window fixing cavity 511, in which the window body 520 is installed. The window cover plate 530 is installed at the end of the window mounting base 510 facing away from the window mounting base 400. It should be noted that some experimental devices in the prior art lack sufficient sealing and pressure-bearing capacity, and the cavity sealing structure is prone to failure and leakage under high pressure conditions. In this embodiment, the window body 520 is fixed by the window mounting base 510 and the window cover plate 530, ensuring the sealing and pressure-bearing capacity of the window assembly 500 and preventing leakage under high pressure conditions.

[0039] Optionally, the viewing window body 520 is made of JGS2 grade quartz glass, which has good light transmission and high temperature resistance, and can complete measurements under high temperature and high pressure.

[0040] Optionally, the end of the window mounting base 400 facing the window fixing base 510 is provided with a first annular groove 404, and one end of the window fixing base 510 is fitted into the first annular groove 404 and sealed with sealant. It is understood that the first annular groove 404 in the window mounting base 400 and the window fixing base 510 mounted in the first annular groove 404 ensure the coaxiality of the window mounting base 400 and the window fixing base 510, thereby ensuring that the window body 520 and the observation tube 102 are coaxially arranged. The window fixing base 510 is sealed to the window mounting base 400 with sealant, which ensures both the connection stability and the sealing performance between the window fixing base 510 and the window mounting base 400.

[0041] Optionally, a second annular groove 531 is provided at one end of the window cover plate 530 facing the window mounting base 510, and the other end of the window mounting base 510 is fitted into the second annular groove 531 and sealed with sealant. It is understood that the second annular groove 531 on the window cover plate 530 and the window mounting base 510 installed in the second annular groove 531 ensure the coaxiality of the window cover plate 530 and the window mounting base 510, thereby ensuring the proper placement of the window body 520 and the window cover plate 530. The window mounting base 510 is sealed to the window cover plate 530 with sealant, ensuring both the stability of the connection between the window mounting base 510 and the window cover plate 530, and also ensuring the sealing performance between the window mounting base 510 and the window cover plate 530.

[0042] Optionally, the window fixing cavity 511 includes a first cavity 5111 and a second cavity 5112. The diameter of the first cavity 5111 is larger than that of the second cavity 5112. The first cavity 5111 is positioned adjacent to the window mounting base 400. The window body 520 is installed in the first cavity 5111, and a sealing ring is provided between the window body 520 and the inner wall of the first cavity 5111. It can be understood that installing the window body 520 in the first cavity 5111 and providing a sealing ring between the window body 520 and the inner wall of the first cavity 5111 can ensure the installation stability of the window body 520 and the installation sealing performance between the window body 520 and the window fixing cavity 511, thereby improving the overall sealing performance of the testing device and enabling the experimental device to operate stably under normal pressure or high pressure conditions.

[0043] Optionally, the inner wall of the window mounting base 400 has a recessed annular groove. The inner wall of the window mounting base 400 abuts against the outer wall of the observation tube 102 to close the opening of the annular groove, forming a purge channel 401. Understandably, in actual installation, it is only necessary to fit the window mounting slot 221 onto the observation tube 102 and then connect it to the observation tube 102 by welding or sealing adhesive. This forms an annular and sealed purge channel 401 between the window mounting base 401 and the observation tube 102, ensuring secondary purging of the spray during operation, guaranteeing the cleanliness of the window assembly 500, and improving the reliability of optical measurements.

[0044] Compared with the prior art, the testing device disclosed in this invention has the following advantages: First, by arranging multiple observation tubes 102 along the circumference of the test body 100, and installing a viewing window component 500 in each observation tube 102, multi-directional optical visualization observation of the spray area can be achieved. The multiple viewing window components 500 can be used to carry out various optical measurements, thereby obtaining the spray atomization structure and its evolution characteristics more comprehensively, and improving the integrity and accuracy of spray measurement.

[0045] Second, by setting an air guide ring 200 on the outside of the air inlet cylinder 300, some gas forms a protective airflow along the inner wall of the air guide ring 200 to perform primary purging of the viewing window assembly 500. A purging hole 103 is provided on the observation cylinder 102, and a purging channel 401 connected to the purging hole 103 is provided on the viewing window mounting base 400 to perform secondary purging of the spray, ensuring the cleanliness of the viewing window and improving the reliability of optical measurement.

[0046] Third, a multi-level sealing structure is set up, with a sealing gasket between the window body 520 and the window mounting base 400. The two ends of the window fixing base 510 are sealed to the window fixing base 510 and the window cover plate 530 respectively by sealant, thereby improving the overall sealing performance of the test device and enabling the experimental device to operate stably under normal pressure or high pressure conditions.

[0047] Fourth, by replacing different limit mounting plates 600, different types of nozzles can be adapted, which facilitates comparative experiments on nozzle atomization characteristics and improves the versatility and experimental flexibility of the device.

[0048] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-directional sealed optical visualization spray atomization characteristic testing device, characterized in that, include: The test body (100) has a test chamber (101) and a plurality of observation tubes (102) arranged circumferentially along the test chamber (101). The observation tubes (102) are provided with purge holes (103) arranged circumferentially along them. A guide ring (200) is installed in the test chamber (101); An air inlet cylinder (300) is provided through the air guide ring (200), and a nozzle is installed inside the air inlet cylinder (300); A viewing window mounting base (400) is mounted on the observation tube (102). The viewing window mounting base (400) is provided with a purge channel (401) connected to the purge hole (103). The purge channel (401) has an air inlet pipe (402) and an air outlet pipe (403). A window assembly (500) is hermetically connected to the window mounting base (400).

2. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 1, characterized in that, The air inlet cylinder (300) includes a first cylinder (310), a first flange (320), and a sealing plate (330). The first flange (320) and the sealing plate (330) are respectively connected to the two ends of the first cylinder (310). The sealing plate (330) has a first central hole (331). A limiting mounting plate (600) is detachably installed on the sealing plate (330). The limiting mounting plate (600) is provided with a second central hole (610) for installing the nozzle.

3. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 2, characterized in that, The sealing plate (330) is provided with a plurality of first mounting holes (332) spaced apart circumferentially along the first central hole (331), and the limiting mounting plate (600) is provided with a plurality of second mounting holes (620) spaced apart circumferentially along the second central hole (610). The first mounting component passes through the second mounting hole (620) and connects with the first mounting hole (332) to fix the limiting mounting plate (600) to the sealing plate (330).

4. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 2, characterized in that, The air guide ring (200) includes a second cylinder (210) and a second flange (220) connected to the second cylinder (210). The second flange (220) is provided with a mounting groove (221), and the first flange (320) is fixed to the mounting groove (221).

5. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 4, characterized in that, The bottom wall of the mounting groove (221) is provided with a plurality of third mounting holes (222) spaced apart along the circumference of the second cylinder (210), and the first flange (320) is provided with a plurality of fourth mounting holes (321) spaced apart along its circumference, and the plurality of third mounting holes (222) and the plurality of fourth mounting holes (321) are provided in a one-to-one correspondence. The second mounting component passes through the fourth mounting hole (321) and connects with the third mounting hole (222) to mount the air inlet cylinder (300) onto the air guide ring (200).

6. The multi-directional sealed optical visualization spray atomization characteristic testing device according to any one of claims 1-5, characterized in that, The window component (500) includes: A window fixing base (510) is provided, one end of which is connected to the window mounting base (400), and the window fixing base (510) has a window fixing cavity (511). A window body (520) is installed in the window fixing cavity (511); A viewing window cover (530) is installed on the end of the viewing window mounting base (510) opposite to the viewing window mounting base (400).

7. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 6, characterized in that, The end of the window mounting base (400) facing the window fixing base (510) is provided with a first annular groove (404), and one end of the window fixing base (510) is fitted into the first annular groove (404) and sealed by sealant.

8. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 6, characterized in that, The end of the window cover plate (530) facing the window fixing seat (510) is provided with a second annular groove (531), and the other end of the window fixing seat (510) is fitted into the second annular groove (531) and sealed by sealant.

9. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 6, characterized in that, The window fixing cavity (511) includes a first cavity (5111) and a second cavity (5112). The diameter of the first cavity (5111) is larger than that of the second cavity (5112). The first cavity (5111) is positioned adjacent to the window mounting base (400). The window body (520) is mounted on the first cavity (5111) and a sealing ring is provided between it and the inner wall of the first cavity (5111).

10. The multi-directional sealed optical visualization spray atomization characteristic testing device according to claim 1, characterized in that, The inner wall of the viewing window mounting base (400) has a recessed annular groove, and the inner wall of the viewing window mounting base (400) abuts against the outer wall of the observation tube (102) to close the opening of the annular groove to form the purging channel (401).

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