Multiphase flow vertical-type water hole with bi-directional flowing function

A two-way flow, water tunnel technology, used in fluid dynamics tests, testing of machine/structural components, measuring devices, etc., can solve the problems of high investment cost, increased investment cost, large space occupation, etc., to achieve multi-phase flow , to ensure the accuracy of the experiment and improve the effect of the quality of the flow field

Active Publication Date: 2018-12-21

HEBEI UNIV OF TECH +1

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Problems solved by technology

The contraction section and the diffusion section of traditional water tunnels have different structures, the flow direction cannot be changed, it takes up a lot of space, and the investment cost is high, and only single-p...

Abstract

The invention discloses a multiphase flow vertical-type water hole with a bi-directional flowing function. The multiphase flow vertical-type water hole comprises a power section, a backflow section, alower rectifying section, a lower diameter-variable section, a work section, an upper diameter-variable section, an upper rectifying section and an upper tank. In work, a second water pump is closed,a first water pump is started, a fluid in the water hole flows to the lower rectifying section, the lower diameter-variable section, the work section, the upper diameter-variable section and the upper rectifying sectionsequentially along the backflow section and then enters the upper tank for closed circulation; or the first water pump is closed, the second water is started, the fluid in the water hole flows to the upper rectifying section, the upper diameter-variable section, the work section, the lower diameter-variable section and the lower rectifying section sequentially along the upper tank and then enters the backflow section for closed circulation. According to the multiphase flow vertical-type water hole, the mode that the first water pump and the second water pump are arranged inparallel is adopted, the movement direction of the fluid is conveniently and rapidly converted; and water replenishing connecting pipes and particle solution connecting pipes are evenly distributed on the lower diameter-variable section and the upper diameter-variable section, the influences of flowing separation on the experimental result are prevented from water replenishment, and through adding of bubbles and particles, multiphase flowing is achieved.

Application Domain

Hydrodynamic testing

Technology Topic

CisternEngineering +1

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Examples

Experimental program(1)

Example Embodiment

[0031] Example one

[0032] See figure 1 , figure 2 with image 3 , A multi-phase flow vertical water tunnel capable of bidirectional flow, including power section 1, return section 2, lower rectification section 3, lower diameter reducing section 4, working section 5, upper reducing diameter section 6, upper rectifying section 7 and Upper water tank 8.

[0033] The upper water tank 8 is horizontally arranged at the upper end of the water tunnel, and the lower end of the upper water tank 8 is connected to the upper rectifying section 7, the upper reducing section 6, the working section 5, the lower reducing section 4 and the lower rectifying section 3 in sequence. The upper end of the upper water tank 8 is provided with an upper cover plate 11, the upper cover plate 11 is a rectangular plate, one side of the lower side of the upper cover plate 11 is connected to the upper side of the upper water tank 8, the upper cover plate The other side of the lower side of 11 is connected to a power section 1. The power section 1 includes a first water pump and a second water pump arranged in parallel in a vertical direction, and the lower end of the power section 1 is connected to a return section 2, the return section 2 includes a lower water tank 21, a first water return pipe 22 and a second water return pipe 23. One end of the upper side of the lower water tank 21 is provided with a lower water tank flange 211, which is connected to the lower end of the lower rectification section 3 through the lower water tank flange 211, The other end of the upper side of the lower tank 21 is connected to the lower ends of the first return pipe 22 and the second return pipe 23, and the upper ends of the first return pipe 22 and the second return pipe 23 are respectively connected to the first water pump and the second water pump, An electric valve 221 and a soft connection 222 are provided in the middle of the first return pipe 22 and the second return pipe 23.

[0034] The power section 1 also includes a power water tank 12 on which the first water pump and the second water pump are installed, and the first water pump includes a first motor 13, a first motor bracket 131, and a first pump tube 132 And the first impeller 133. A first motor support 131 is installed on the base of the first motor 13 and is fixedly connected to the power support through the first motor support 131. The power support is not rigidly connected to the water tunnel main support, preventing the first motor The vibration of 13 is transmitted to the main structure of the water tunnel. The first pump tube 132 is connected to the lower side of the power water tank 12, the first impeller 133 is mounted on the first impeller shaft, the upper end of the first impeller shaft is connected to the output shaft of the first motor 13, and the first The lower end of the impeller shaft is connected in the first pump tube 132 through a shaft sleeve.

[0035] Similarly, the second water pump includes a second motor 14, a second motor bracket 141, a second pump tube 142, and a second impeller 143. The second motor 14, the second motor bracket 141, the second pump tube 142, and the The connection mode of the second impeller 143 is the same as the connection mode of the first water pump.

[0036] See Figure 4 with Figure 8 The lower rectification section 3 includes a lower rectification box 31, a lower honeycomb 32, and two lower damping nets 33. The lower rectification box 31 is made of stainless steel plate, and the lower honeycomb 32 is horizontally installed in the lower rectification box. Inside the body 31 and close to the lower end of the lower rectifying box body 31, the two lower damping nets 33 are installed above the lower honeycomb device 32 and parallel to the lower honeycomb device 32.

[0037] The upper rectifying section 7 includes an upper rectifying box 71, an upper honeycomb 73, and two upper damping nets 72. The upper rectifying box 71 is made of stainless steel plate, and the upper honeycomb 73 is installed in the upper rectifying box in a horizontal direction. Inside the body 71 and close to the upper end of the upper rectifying box 71, the two upper damping nets 72 are installed below the upper honeycomb device 73 and are parallel to the upper honeycomb device 73.

[0038] The lower honeycomb device 32, the upper honeycomb device 73, the lower damping net 33, and the upper damping net 72 rectify the fluid in the water tunnel and improve the quality of the flow field.

[0039] See Figure 5 with Figure 7 , The lower diameter reducing section 4 includes a small square flange 41, a particle solution connector 42, a curved box 43, a large positive flange 44, and three replenishing pipes 45. The curved box 43 is made of stainless steel plate. The upper end of 43 is connected to the small positive method flange 41, and the lower end of the curved box body 43 is connected to the large positive method flange 44. The particle solution connector 42 and the three replenishing pipes 45 are respectively connected to the curved box body 43 on the lower side of the small positive method flange 41. On both sides, and the connecting position is close to the small square flange 41. The structure of the upper diameter reducing section 6 is the same as that of the lower diameter reducing section 4, and the installation direction of the upper diameter reducing section 6 is opposite to the installation direction of the lower diameter reducing section 4 in the vertical direction.

[0040] See Image 6 The working section 5 is made of transparent plexiglass, including an upper flange 51, a detachable vertical plate 52 and a lower flange 53, the working section 5 is a square cross-section surrounded by four rectangular transparent plexiglass plates In the cavity, one of the rectangular transparent organic glass plates is a detachable vertical plate 52, the upper end of the working section 5 is connected with an upper flange 51, and the lower end of the working section 5 is connected with a lower flange 53.

[0041] See Picture 9 The upper water tank 8 includes an upper water tank body 81, a horizontal orifice plate 82, two vertical orifice plates 84, and four baffles 83. The upper water tank body 81 is made of stainless steel plate, and the upper water tank body One side of the lower side of 81 is provided with a square hole, and a horizontal orifice plate 82 is connected to the square hole. The baffle plate 83 is a plate with a circular arc section. The four baffle plates 83 are arranged in parallel in a stepped manner. Above the orifice plate 82, the two vertical orifice plates 84 are arranged in parallel in the upper tank body 81 and parallel to the deflector 83.

[0042] When working, the main structure of the water tunnel is fixedly connected to the ground of the laboratory with the main frame of the water tunnel, and a valve is installed on each of the particle solution nozzle 42 and the three water supplement nozzles 45. Turn off the second water pump, and close the electric valve at the lower end of the second water pump, start the first water pump, and open the electric valve at the lower end of the first water pump, the fluid in the water tunnel flows along the first return pipe 22 to the downward rectifying section 3 and the lower reducing diameter. Section 4, working section 5, upper reducing section 6 and upper rectifying section 7, and then enter the upper water tank 8 and closed loop.

[0043] In the same way, turn off the first water pump, close the electric valve at the lower end of the first water pump, start the second water pump, and open the electric valve at the lower end of the second water pump. The fluid in the water tunnel flows along the upper tank 8 in turn, upwards rectification section 7, upward transformation The diameter section 6, the working section 5, the lower diameter reducing section 4 and the lower rectifying section 3, then enter the second return pipe 23 and closed loop.

[0044] The partial water replenishment through the replenishing nozzle 45 prevents flow separation from affecting the experimental results. The solid particle solution or air bubbles are injected through the particle solution nozzle 42 to realize multiphase flow and ensure the accuracy of the experiment.

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Multiphase flow vertical-type water hole with bi-directional flowing function

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