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An annular flume device that can be used to simulate the flow characteristics of natural rivers

An annular water tank and river channel technology, applied in the fields of environmental fluid mechanics and water conservancy engineering, can solve the problems of large area and complex structure, and achieve the effect of sensitive response and flexible operation.

Inactive Publication Date: 2016-04-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the straight water tank and the fold-back water tank have the disadvantage of occupying a large area. For example, the fold-back straight water tank developed by Zhejiang University has 7 channels and a total length of 339.3m.
The combined circulating water tank developed by Hangzhou University retains some advantages of the straight water tank and the circular water tank, but the structure is complicated.

Method used

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  • An annular flume device that can be used to simulate the flow characteristics of natural rivers
  • An annular flume device that can be used to simulate the flow characteristics of natural rivers
  • An annular flume device that can be used to simulate the flow characteristics of natural rivers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as Figure 1-Figure 4 As shown, the annular water tank device is composed of five parts: an annular water tank, a shear ring, a transmission system, a sampling system, and an online control cabinet.

[0029]The inner and outer walls of the annular water tank 1 are made of plexiglass, and the thickness of the glass is 10mm. The inner diameter of the inner wall 28 of the annular water tank is 1400mm, and the height is 400mm; the outer diameter of the outer wall of the annular water tank 29 is 2000mm, and the height is 450mm. On the ring plate 30, the whole is fixed on the bottom steel structure support 11 with screws 31. The steel structure support 11 is composed of 8 steel pipes, and is supported by 8 third steel pipe supports 12 below. 12 are made of steel pipes, and the upper and lower 8 steel pipes are respectively welded on the shaft sleeve. The inner and outer walls of the annular water tank are 300mm away from the bottom ring plate. There are ring pieces 6 w...

Embodiment 2

[0040] Embodiment 2: adopt the device as described in embodiment 1, the simple and easy test method of particulate matter concentration in the annular tank, take powdered activated carbon as example here

[0041] Step 1, use a rubber tube to add water to a height of 30cm in the ring tank, and prepare powdered activated carbon with a concentration of 2, 5, 10, 15, 20, 25, 30mg / L. According to the principle of fluid mechanics, the critical shear force at which the powdered activated carbon does not settle is obtained through literature or experimental methods, and then converted to obtain the flow velocity in the water tank. The critical sedimentation shear force of the powdered activated carbon used in this test is 0.6Pa, and the corresponding water flow velocity should be 43cm / s. If only the annular water tank is turned, and the shear ring is not opened, the corresponding rotational speed of the annular water tank is 10r / min. Adjust the rotational speed of the annular water ta...

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Abstract

The invention relates to an annular water tank device applicable to the simulation of the water flow characteristics of a natural river channel. An annular water tank comprises an annular sheet, supporting sheets, a steel structure bracket, an annular water tank inner wall, an annular water tank outer wall and an annular plate, wherein a shearing ring consists of a shearing ring inner wall, a shearing ring outer wall and steel pipes; a transmission system comprises a shearing ring lifting system and a rotary control system; the shearing ring lifting system comprises steel pipes, steel pipe brackets, an alternating current servo motor, a top suspension mechanism and a lifting rod; a placement control system comprises belt pulleys and an alternating current servo motor; and a sampling system comprises sampling holes and a sampling bottle. With an acoustic Dopler velocimeter, the annular water tank device reads the three-dimensional spot speed in the water tank, the sampling rate reaches 25 Hz, and the accuracy of the velocimeter is 0.1 mm / s, so that an accurate calibration effect is achieved, and transverse circulation is eliminated. A control cabinet is provided with a liquid crystal display for touching operation, multi-gear regulation and automatic sampling can be realized, the operation of the annular water tank is optimized, and the device is effective equipment for research on the hydraulic characteristics of sediment.

Description

technical field [0001] The invention belongs to the fields of environmental fluid mechanics and water conservancy engineering, and in particular relates to an annular water tank device which can be used to simulate the water flow characteristics of natural rivers. Background technique [0002] In recent decades, sediment research has been a common concern of environmental science and water conservancy science, and the tank is an important equipment for studying sediment properties. The water tank can be used to test and study the basic laws of scouring, settlement and transport of granular sediment, as well as some hydraulic characteristics. In addition, it can also conduct experiments such as physical sand selection models. [0003] According to the shape, the water tank mainly includes: straight water tank, circular water tank, folding straight water tank, combined circulating water tank. Both the straight water tank and the fold-back water tank have the disadvantage of o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00G01N15/06
Inventor 尹海龙徐祖信解铭李怀正
Owner TONGJI UNIV
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