Liquid ammonia flow visualization experiment device with good sealing performance

Abstract

The invention provides a liquid ammonia flow visualization experiment device with good sealing performance, which comprises a front plate, a cylindrical surface gasket, a boss gasket, a front glass sheet, a two-dimensional runner plate, a rear glass sheet, a rear plate gasket and a rear plate, the front glass sheet, the two-dimensional flow channel, the rear glass sheet and the three sealing pieces are assembled in the space between the groove and the boss, and two through holes are formed in the center of the front plate and the center of the rear plate respectively and used for observing the flowing condition of fluid in the two-dimensional flow channel sheet through the glass sheets. Through the design of the observation window, the flowing state of the liquid ammonia in the runner at the nozzle under different working conditions can be captured in real time, and the observation window is used for visual research in the liquid ammonia two-dimensional runner.

Description

Technical Field

[0001] The invention relates to the field of two-dimensional visualization of nozzles, in particular to the sealing of a two-dimensional flow channel visualization experimental device for toxic fluids such as liquid ammonia. Technical Background

[0002] The research on cavitation inside diesel nozzles has been relatively mature, but the difference between cavitation flow inside liquid ammonia and diesel nozzles lies in the fact that the thermal effect in the cavitation phase change cannot be ignored. The two cavitation phase change driving competition mechanisms of inertial force and heat transfer under the influence of high-speed turbulence, thermal convection, thermal diffusion, and gas-liquid velocity slip are more complex. Therefore, for liquid ammonia fuel, actively exploring the optical quantitative measurement of velocity field and pressure field of micro-scale, high-speed, and strongly turbulent cavitation two-phase flow, especially the acquisition of temperature field will be particularly critical to reveal the above two cavitation phase change driving competition mechanisms and construct a cavitation model that accurately introduces thermal effects.

[0003] Liquid ammonia exists in the form of ammonia gas under normal pressure. If you want to carry out a liquid ammonia two-dimensional flow channel visualization experiment, good sealing of the experimental device is crucial. On the one hand, sealing affects the accuracy of the experimental results, and on the other hand, it is directly related to whether the experiment can be carried out and carried out smoothly. Therefore, the sealing of the liquid ammonia two-dimensional flow channel visualization device is the basis for optical quantitative measurements such as two-dimensional velocity field and pressure field. Summary of the invention

[0004] Based on the technical requirements of the prior art, the present invention provides a liquid ammonia two-dimensional flow channel visualization experimental device, which has good sealing performance when using toxic fluids such as ammonia gas / liquid ammonia as the working fluid, ensuring the accuracy of the experimental results and the safety of the experimental process; in terms of processing, it achieves the requirements of simple structure, convenient processing, and easy disassembly and installation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A liquid ammonia flow visualization experimental device with good sealing performance, characterized in that it comprises a front plate, an O-shaped cylindrical gasket, a boss gasket, a front glass sheet, a two-dimensional flow channel sheet, a rear glass sheet, a rear plate gasket and a rear plate, wherein the front plate and the rear plate respectively have bosses and grooves with the same shape and size, and sealing grooves are respectively provided on the outer surface of the boss circumference and on the bottom of the groove, respectively for accommodating the O-shaped cylindrical gasket and the rear plate gasket; the bosses and grooves of the front plate and the rear plate are assembled with each other and fastened by bolt connection to form a closed space therebetween, and the boss gasket, the front glass sheet, the two-dimensional flow channel sheet and the rear glass sheet are sequentially stacked in the closed space;

[0007] The two-dimensional flow channel sheet is provided with a flow channel to be observed, and a front observation window and a rear observation window are provided at positions corresponding to the flow channel to be observed on the front plate and the rear plate;

[0008] The front plate and the front glass sheet or the rear plate and the rear glass sheet are also provided with penetrating inlets and outlets, which are respectively connected with the flow channels on the two-dimensional flow channel sheet.

[0009] Furthermore, the two-dimensional flow channel sheet is composed of a flow channel sheet inlet, a flow channel to be observed and a flow channel sheet outlet. The flow channel diameter between the flow channel to be observed and the flow channel sheet inlet is larger than the diameter of the flow channel to be observed. There is a spray chamber between the flow channel to be observed and the flow channel sheet outlet.

[0010] Furthermore, the O-type cylindrical gasket and the boss gasket are made of silicone material.

[0011] Furthermore, the threaded holes of the front plate correspond to the threaded holes of the rear plate, and the front and rear plates are connected together by screws.

[0012] Furthermore, the front glass sheet and the rear glass sheet are made of quartz glass.

[0013] Furthermore, the front plate is provided with positioning holes at the top and bottom and is fixed on the optical platform by screws.

[0014] Furthermore, the two-dimensional flow channel sheet is made of stainless steel.

[0015] The liquid ammonia flow visualization experimental device with good sealing performance of the present invention has the advantages of simple structure, convenient processing technology, good sealing performance, etc., and can achieve good sealing of toxic working fluids such as ammonia gas / liquid ammonia under certain working conditions. The upstream and downstream of the flow channel to be observed in the two-dimensional flow channel sheet are designed according to the flow channel structure at the actual nozzle position. Through the design of the observation window, the flow state of liquid ammonia in the flow channel at the nozzle under different working conditions can be captured in real time.

[0016] In addition, by changing the material, the device can also be used for two-dimensional flow channel visualization experiments of toxic fluids such as methanol and dimethyl ether, showing strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded view of the liquid ammonia flow visualization experimental device with good sealing performance described in the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of the liquid ammonia flow visualization experimental device with good sealing performance according to the present invention.

[0019] Figure 3 It is a structural schematic diagram of the front plate.

[0020] Figure 4 Schematic diagram of the structure of the two-dimensional flow channel sheet.

[0021] Figure 5 Schematic diagram of the structure of the rear plate.

[0022] In the figure: 1. front plate, 11. positioning hole, 12. first sealing groove, 13. front plate threaded hole, 14. inlet, 15. observation window, 16. outlet, 2. O-type cylindrical gasket, 3. boss gasket, 4. front glass sheet, 5. two-dimensional flow channel sheet, 51. two-dimensional flow channel sheet inlet, 52. flow channel to be observed, 53. flow channel sheet outlet, 6. rear glass sheet, 7. rear plate gasket, 8. rear plate, 81. positioning hole, 82. groove, 83. positioning hole, 84. observation window, 85. rear plate threaded hole, 86. second sealing groove. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 1 , 2 As shown, the liquid ammonia flow visualization experimental device with good sealing performance described in the present invention comprises a front plate 1, an O-type cylindrical gasket 2, a boss gasket 3, a front glass sheet 4, a two-dimensional flow channel sheet 5, a rear glass sheet 6, a rear plate gasket 7 and a rear plate 8. The front plate 1 and the rear plate 8 are respectively provided with bosses and grooves of the same shape and size, and sealing grooves are respectively provided on the outer surface of the boss circumference and the bottom of the groove, which are respectively used to accommodate the O-type cylindrical gasket 2 and the rear plate gasket 7; the bosses and grooves of the front plate 1 and the rear plate 8 are assembled with each other and fastened by bolts to form a closed space between the two, and the boss gasket 3, the front glass sheet 4, the two-dimensional flow channel sheet 5, and the rear glass sheet 6 are sequentially stacked in the closed space. The two-dimensional flow channel sheet 5 is provided with a flow channel to be observed, and a front observation window 15 and a rear observation window 84 are provided at positions corresponding to the flow channel to be observed on the front plate 1 and the rear plate 8. The front plate 1 and the front glass sheet 4 or the rear plate 8 and the rear glass sheet 6 are also provided with a penetrating inlet 14 and an outlet 16 which are respectively connected to the flow channel on the two-dimensional flow channel sheet 5 .

[0025] Specifically, Figure 4 As shown, the two-dimensional flow channel sheet 5 is composed of a flow channel sheet inlet 51, a flow channel to be observed 52 and a flow channel sheet outlet 53. The flow channel diameter between the flow channel to be observed 52 and the flow channel sheet inlet 51 is larger than the diameter of the flow channel to be observed 52, and there is a spray cavity between the flow channel to be observed 52 and the flow channel sheet outlet 53. Since the experimental working fluid is highly corrosive, stainless steel is used as the material.

[0026] The front plate 1 and the rear plate 8 are made based on a simple machining process, such as Figure 3 , Figure 5As shown, a first sealing groove 12 is opened on the outer surface of the circumference of the boss of the front plate 1, and a second sealing groove 86 is opened at the bottom of the groove of the rear plate 8. An O-type cylindrical gasket 2 is added to the first sealing groove 12. Under the extrusion of the front plate boss and the rear plate groove, the O-type gasket is deformed and fills the first sealing groove, thereby achieving a good seal between the boss and the groove. A rear plate gasket 7 is added to the second sealing groove 86, and the rear plate gasket 7 is deformed under pressure to achieve the sealing of the rear glass sheet 6 and the bottom surface of the groove 82. Since the rear plate gasket 7 has a certain deformation capacity, it can avoid the occurrence of glass breakage caused by uneven force when the rear glass sheet 6 and the groove 82 are hard-sealed to a certain extent. Line sealing is achieved by O-type cylindrical gasket 2 and rear plate gasket 7 respectively; surface sealing is achieved between the front plate 1 boss and the front glass sheet 4 by the boss gasket 3. The front plate screw hole 13 corresponds to the rear plate threaded hole 85, and the front and rear plates are connected by screws. The inlet 14 and the outlet 16 on the front plate 1 correspond to the inlet and outlet of the fluid respectively, and are connected to the flow channel plate inlet 51 and the flow channel plate outlet 53 of the two-dimensional flow channel plate 5. The observation window 15 is used to observe the flow condition in the test area.

[0027] The O-type cylindrical gasket 2 and boss gasket 3 are made of silicone material, which is resistant to liquid ammonia corrosion and has a certain deformation ability, so as to achieve a good sealing effect. The positioning hole 83 on the rear plate 8 is used to determine the position of the two-dimensional flow channel sheet 5 to ensure the consistency of the inlet and outlet.

[0028] The front glass sheet 4 and the rear glass sheet 6 are made of quartz glass. The front glass sheet 4 has two through holes at the inlet 14 and the outlet 16 of the front plate 1 for fluid to enter and exit. The rear glass sheet 6 has no through holes.

[0029] The inlet 14 and the outlet 16 may also be arranged on the rear plate 8 , and the corresponding rear glass sheet 6 may also be provided with the inlet 14 and the outlet 16 , in which case the front glass sheet 4 is not provided with a through hole.

[0030] The front plate 1 and the rear plate 8 are provided with positioning holes 11 at the top and bottom, which are used to fix the entire liquid ammonia two-dimensional flow channel visualization experimental device on the optical platform by screws.

[0031] During the experimental preparation stage, first place the O-shaped cylindrical gasket 2 and the boss gasket 3 in the first sealing groove 12 and the front plate boss respectively, and place the rear plate gasket 7 in the second sealing groove 86. Then, in the order of the rear plate gasket 7, the rear glass sheet 6, the two-dimensional flow channel sheet 5 and the front glass sheet 4, they are placed in the rear plate groove. It should be noted that the flow channel sheet inlet 51 and the flow channel sheet outlet 53 of the two-dimensional flow channel sheet 5 should correspond one by one to the positioning holes 83 of the front glass sheet 4 and the rear plate 8 respectively. Pay attention to the assembly of the two-dimensional flow channel sheet 5. The inlet corresponds to the smaller side of the flow channel, and the outlet corresponds to the larger side of the flow channel.

[0032] like Figure 3As shown, the size of the first sealing groove 12 and the second sealing groove 86 of the front plate 1 and the rear plate 8 must be selected according to the size of the O-ring and in accordance with regulations. The eight holes for inserting the screws of the front plate 1 must be made in the form of through holes. When assembling the front and rear plates, the eight screws cannot be tightened in sequence, but must be tightened synchronously from loose to tight in pairs. On the one hand, this can prevent the front and rear glass sheets from breaking, and on the other hand, it can prevent the O-ring from being unevenly stressed and deformed. The entire assembly process uses hard sealing by tightening the screws and soft sealing by deformation of the sealing gasket. The combination of the two sealing methods ensures that all gaps between the front and rear plates are well sealed.

[0033] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A liquid ammonia flow visualization experimental device with good sealing performance, characterized in that: It comprises a front plate (1), an O-shaped cylindrical gasket (2), a boss gasket (3), a front glass sheet (4), a two-dimensional flow channel sheet (5), a rear glass sheet (6), a rear plate gasket (7) and a rear plate (8), wherein the front plate (1) and the rear plate (8) are respectively provided with bosses and grooves of corresponding shapes and sizes, and sealing grooves are respectively provided on the outer circumferential surface of the bosses and at the bottom of the grooves, respectively used to accommodate the O-shaped cylindrical gasket (2) and the rear plate gasket (7); the bosses and grooves of the front plate (1) and the rear plate (8) are assembled with each other and fastened by bolt connection, so that a closed space is formed between the two, and the boss gasket (3), the front glass sheet (4), the two-dimensional flow channel sheet (5) and the rear glass sheet (6) are sequentially stacked in the closed space; The two-dimensional flow channel sheet (5) is provided with a flow channel to be observed, and a front observation window (15) and a rear observation window (84) are provided on the front plate (1) and the rear plate (8) at positions corresponding to the flow channel to be observed; The front plate 1 and the front glass sheet (4) or the rear plate (8) and the rear glass sheet (6) are also provided with a penetrating inlet (14) and an outlet (16), which are respectively connected to the flow channel on the two-dimensional flow channel sheet (5).

2. According to the liquid ammonia flow visualization experimental device with good sealing performance as described in claim 1, it is characterized in that: The two-dimensional flow channel sheet (5) is composed of a flow channel sheet inlet (51), a flow channel to be observed (52) and a flow channel sheet outlet (53); the flow channel diameter between the flow channel to be observed (52) and the flow channel sheet inlet (51) is larger than the diameter of the flow channel to be observed (52); and a spray chamber is provided between the flow channel to be observed (52) and the flow channel sheet outlet (53).

3. According to the liquid ammonia flow visualization experimental device with good sealing performance as described in claim 1, it is characterized in that: The O-shaped cylindrical gasket (2) and the boss gasket (3) are made of silicone material.

4. The liquid ammonia flow visualization experimental device with good sealing performance according to claim 1 is characterized in that: The threaded holes (13) of the front plate correspond to the threaded holes (85) of the rear plate, and the front and rear plates are connected by screws.

5. The liquid ammonia flow visualization experimental device with good sealing performance according to claim 1 is characterized in that: The front glass sheet (4) and the rear glass sheet (6) are made of quartz glass.

6. The liquid ammonia flow visualization experimental device with good sealing performance according to claim 1 is characterized in that: The front plate (1) is provided with positioning holes (11) at the top and bottom and is fixed on the optical platform by screws.

7. The liquid ammonia flow visualization experimental device with good sealing performance according to claim 1 is characterized in that: The two-dimensional flow channel sheet (5) is made of stainless steel.

Images