Test device and method for evaluating drag reduction effects on non-smooth surfaces

Abstract

The invention provides a test device and method for assessing a non-smooth surface anti-drag effect. The device comprises a slab model, a strain type balance supporting force transmission rod, a force measurement element and a laser vibration measurement instrument. The slab model is hung in a water tunnel formed by the water tunnel side wall and the water tunnel bottom wall through steel wire ropes. The lengths of all the steel wire ropes are the same. The tops of the steel wire ropes are at the same height. The strain type balance supporting force transmission rod is vertically arranged in the water tunnel which contains liquid. The front end of the slab model is in contact with the strain type balance supporting force transmission rod. The force measurement element is arranged on the strain type balance supporting force transmission rod. When liquid is static, the reading of the force measurement element is zero. The laser vibration measurement instrument is arranged facing the steel wire ropes. Laser light paths generated by the laser vibration measurement instrument are parallel to the slab model which comprises a smooth surface slab and a non-smooth surface slab to be assessed. According to the test device and method, the test principle is simple, the evaluation method is visual, test results are reliable, and operation is convenient.

Description

technical field [0001] The invention relates to a device for measuring the fluid friction resistance of a smooth surface and a non-smooth surface at different flow rates, and a method for evaluating the drag-reducing effect of the non-smooth surface. Background technique [0002] At present, relevant scholars at home and abroad have carried out extensive and in-depth theoretical exploration and applied research on the problem of motion drag reduction between fluid and solid interfaces, and have successfully achieved remarkable progress in many aspects. Since the problem of drag reduction can directly affect the energy consumption and mechanical properties of equipment, the research on this problem has always been concerned by experts and scholars from various countries. The research methods are mainly from theoretical analysis, numerical simulation, model test and other aspects. The drag reduction performance of the sample is tested in the test device and the required conclu...

AI Technical Summary

Problems solved by technology

However, the research on the device for measuring the frictional resistance of fluid on a fixed surface is still immature, and there are few test devices for evaluating the drag reduction effect of non-smooth surfaces. The test device is particularly important

[0003] At present, the non-smooth surface and surface coating structure fluid friction resistance testing devices are mostly focused on the pressure difference flow resistance test method. No.: CN202013316U, the patent application titled "differential pressure flow resistance tester" is suitable for the flow resistance test of pipelines, but not for the flow resistance test of non-smooth surface plates

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