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Method and device for simulating variable roughness factor ice cover in ice water dynamic test

A technology of dynamics and ice caps, which is applied in the field of variable roughness ice cap simulation and devices in ice hydrodynamic tests, which can solve the uneven distribution of flow velocity in the experimental section, the difficulty of regular series tests, and increase the roughness of foam boards, etc. problem, achieve the effect of reducing auxiliary time, speeding up test speed and ensuring accuracy

Inactive Publication Date: 2015-11-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ice sheet simulation technology commonly used in the laboratory is mainly to artificially insert bamboo sticks on the foam board, and artificially increase the roughness of the foam board. Because the depth and density of the artificially inserted bamboo sticks are difficult to control, this method is suitable for the roughness of the ice sheet. The randomness of the control is relatively large, which brings difficulties to the regular series of experiments
And if the density distribution of bamboo sticks is uneven, the flow velocity distribution of the experimental section will be uneven, which will affect the accuracy of the experiment, and even the accuracy

Method used

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  • Method and device for simulating variable roughness factor ice cover in ice water dynamic test
  • Method and device for simulating variable roughness factor ice cover in ice water dynamic test
  • Method and device for simulating variable roughness factor ice cover in ice water dynamic test

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Embodiment 1

[0016] This embodiment is a method for simulating ice sheets with variable roughness in ice hydrodynamic tests. The method uses polyethylene sheets as the material for simulating ice sheets, and multiple long-axis directions are set on one side of the polyethylene sheets. The elongated rough blocks perpendicular to the plane of the plate are used to simulate various roughnesses at the bottom of the ice sheet by using rough blocks of different lengths and different arrangements of rough blocks.

[0017] The basis of the method described in this embodiment is:

[0018] 1. Basis for selection of ice sheet simulation materials:

[0019] The ice hydrodynamic experiment in the laboratory needs to meet the similarity of the ice movement characteristics of the prototype and the model, namely:

[0020] ( V 2 g ρ ...

Embodiment 2

[0038] This embodiment is a variable roughness ice sheet simulation device designed according to the method described in Embodiment 1, such as figure 1 shown. This embodiment includes a simulated ice cover plate 2 adapted to the width of the simulated river channel 1. The material of the simulated ice cover plate is a polyethylene plate, and a plurality of fixing holes 201 are uniformly distributed on the simulated ice cover plate. A rough block 3 simulating roughness is fixed in the fixing hole according to the test, and the material of the rough block is a polyethylene rod.

[0039] In this embodiment, polyethylene sheet is used as the material for simulating ice cubes, and the simulated plate-shaped ice cubes float or cover on the water surface. According to the calculation of Example 1, the density of the polyethylene material is close to that of ice, therefore, the polyethylene sheet can completely simulate the floating state of a plate-shaped ice cube on water, includin...

Embodiment 4

[0050] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the above-mentioned embodiment regarding the combination of the simulated ice sheet and the simulated rough block. The fixing hole on the simulated ice sheet in this embodiment is a circular through hole, the rough block is a cylindrical rod with a diameter suitable for the fixing hole, and one end of the rod is fixed with a diameter larger than that of the rod. A disc with a material diameter, the disc is detachably connected to the simulated ice sheet through a fixing device.

[0051] Round rods and round holes are the easiest shapes to process. The fixed holes and rough blocks described in this embodiment use round shapes, while round rod profiles and round holes are the easiest to process, which can save experimental costs and reduce costs.

[0052] The meaning that the diameter of the rough block is compatible with the diameter of the fixed block is: the nominal diameter of ...

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Abstract

The invention relates to a method and device for simulating a variable roughness factor ice cover in an ice water dynamic test. The device comprises a simulated ice cover plate which is matched with a simulated river course is width, the simulated ice cover plate is made of polyethylene boards, multiple fixing holes are formed in the simulated ice cover plate uniformly, rough blocks for simulating the roughness factor are fixed in the fixing holes correspondingly according to test requirements, and the rough blocks are made of polyethylene bars. According to the method and device, the ubiquitous material, namely the polyethylene, serves as the material for simulating the ice cover, the ice cover plane is simulated by boards, the long-strip-shaped polyethylene materials are erected on the board for simulating the rough surface of the ice cover, and simulated ice covers of different roughness factors are formed. Due to the fact that the long-strip-shaped materials which are different in length and density can be replaced in various simple ways, the ice covers of different roughness factors can be simulated, the test can be accelerated, and the test cost can be reduced greatly.

Description

technical field [0001] The invention relates to a variable roughness ice cover simulation method and device in an ice hydrodynamic test, and is a hydraulic experiment method and device, and a method and device for an ice hydrodynamic experiment. Background technique [0002] After winter, the temperature drops and the water body loses heat. When the water temperature drops below 0°C, ice flakes will appear in the river channel. As the water body continues to lose heat, drift ice will further appear on the surface of the water flow. Affected by water flow conditions, terrain conditions and wind direction, drift ice on the surface of the water body will accumulate and form ice, and the existence of ice sheets will greatly increase the wetted area and resistance. significantly lowered. Because the field prototype observation of ice conditions is dangerous, it is an important means to study ice hydrodynamics by carrying out simulation research in the laboratory. Experimental s...

Claims

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Application Information

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IPC IPC(8): G01N33/18
Inventor 付辉郭新蕾郭永鑫王涛李甲振黄伟
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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