Testing apparatus for evaluating drag-reduction effects of bionic non-smooth surface and bionic jet surface

Abstract

The invention provides a testing apparatus for evaluating the drag-reduction effects of a bionic non-smooth surface and a bionic jet surface. The testing apparatus comprises a sealing shaft, a power input and signal output mechanism, a sensor mechanism, a gas-tight silo and a water distribution mechanism, wherein the power input and signal output mechanism is arranged at one end of the sealing shaft, the sensor mechanism is arranged at the other end of the sealing shaft, and the gas-tight silo surrounds the sensor mechanism. The testing apparatus provided by the invention is suitable to be used for testing the drag-reduction effects of a non-smooth surface and a surface coating as well as a bionic jet surface; and a data acquisition system is simple in structure, easy to operate, and accurate in testing. By using the testing apparatus provided by the invention, both the drag-reduction effect of a non-smooth surface and the drag-reduction effect of a jet surface structure also can be evaluated. The fluid friction resistance values of the testing apparatus under different test sample conditions are acquired by using the data acquisition system, and then the data comparison is performed so as to obtain the drag-reduction effects of different surface structures, thereby studying the drag-reduction characteristics of a non-smooth surface structure and a jet surface structure.

Description

technical field [0001] The invention relates to a test device capable of testing the frictional resistance of fluid to different surface structures, and is especially suitable for testing the drag-reducing effect of non-smooth surface structures and surface coatings, and testing the drag-reducing effect of bionic jet surfaces. Background technique [0002] The current test devices for testing fluid friction resistance mainly include test devices such as water holes, pools, and drags. As an important means of studying fluid drag reduction, test methods play a vital role in promoting the development of fluid drag reduction theory. Many important phenomena of fluids are first obtained under test conditions. With the rapid development of drag reduction technology, how to design a test device that can evaluate the frictional resistance of fluid to different surface structures is particularly important. In the traditional fluid dynamics research, the water tunnel test device is m...

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Problems solved by technology

In the traditional fluid dynamics research, the water tunnel test device is mainly used, but its volume is large, the cost is high, the operation is cumbersome, the control of test conditions is difficult, and the test model is complicated

The number of existing pools in our country is limited, the construction of well-equipped pools is expensive, the daily maintenance is difficult, and the test cost is high. Generally, it is only studied for some large-scale tests in the country and cannot be widely used.

Existing small-scale fluid mechanics test equipment can complete pipeline loss tests, local loss tests, Reynolds tests, Bernoulli equation tests, and Venturi flowmeter calibration, etc., but most of them are only for test teaching and cannot be used for The evaluation of fluid drag reduction greatly limits the test application field of the test device, and at the same time, the jet surface drag reduction test cannot be carried out

The existing drag test device has a small test speed range and is only limited to the pool test. Due to the limitation of the length of the pool, the test cost is relatively high

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