Fluid drag reduction effect test device for surface microstructure

Abstract

The invention provides a fluid drag reduction effect test device for a surface microstructure. The device comprises an environment simulation unit, a motion control unit and a photographing and recording unit. The environment simulation unit comprises a tube, a turbine, a partition plate, a heating tube, a temperature controller and an external controller. The tube is a hollow container with an opening end and a closed end, is vertically arranged along the direction of gravity and is filled with a test liquid. The motion control unit comprises a guide rail slider mechanism, a sample clamper, apulley, a pulley rope and a driving object. The photographing and recording unit is a high-speed camera and is installed outside the tube so that the photographing and recording unit can clearly shoot the process of driving a sample to vertically upward move from the bottom along the gravity direction after focal length adjustment. The device realizes the accurate test on the fluid drag reductioneffect of a surface microstructure, can test fluid drag reduction effects of samples with different surface microstructures under different fluid environment conditions of different driving energy consumption, traction driving forces or traction speeds.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a fluid drag reduction effect testing device for surface microstructures. Background technique [0002] The component force of the fluid force that the object is subjected to against the direction of motion of the object or along the direction of the incoming flow velocity is called fluid resistance. Due to the viscous effect of the liquid, the surface of the object will produce a friction force tangent to the object surface, and the resultant force of all friction forces is called friction resistance. In the actual fluid, under the action of viscosity, not only frictional resistance will be generated, but also the surface pressure distribution will be different from that in the ideal fluid, and pressure differential resistance will be generated. The surface frictional resistance accounts for a large proportion of the total resistance of marine transportation tools...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no general standardized method for testing the drag reduction effect of liquid fluid on the microstructure of solid surfaces. Generally, pipelines (water tunnels) or circulating water tanks are used. By setting the working section and the control section in parallel, the sample is placed in a certain working section. Test parameters such as the pressure, flow rate, and flow velocity at the inlet and outlet of the liquid flow in the working section and the control section, and obtain comparable data on the impact of different solid surface microstructures on the liquid flow pressure, flow, and flow velocity, and then calculate the microstructure of different solid surface microstructures. Liquid fluid drag reduction effect of structure (relative percentage)

The characteristic of this type of test method is that the test sample is fixed during the test, and only the viscous resistance effect of the test sample surface relative to the incoming flow is measured, so it is highly dependent on stable and precise liquid flow control, and the corresponding pipeline (water hole) ) or the circulating tank system is complicated and costly, and the drag reduction detection of wall turbulent fluid such as superhydrophobic surface and bionic groove method is not easy to clamp and adjust, and the applicability is not good

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