Gravity circulating water tunnel for underwater complex surface anti-drag measurement

Abstract

The invention provides a gravity circulating water tunnel for underwater complex surface anti-drag measurement. The gravity circulating water tunnel comprises a power system. The power system comprises a high water tank provided with a water outlet, used as a water source of the gravity circulating water tunnel, and outputting water from the water outlet; a liquid level measuring device used for measuring a liquid level in the high water tank in real time, and outputting a measured liquid level signal; a liquid level control system connected with the liquid level measuring device and used foradjusting the liquid level in the high water tank according to the measured liquid level signal to keep the liquid level constant; a flow rate adjusting device arranged on a water flow path behind thewater outlet of the high water tank and used for controlling a flow rate in order to make the flow rate reach a set value. The gravity circulating water tunnel can realize a variable speed in a widerange under a limited experimental space, can improve the uniformity of a flow field, can accurately control the flow rate at a centimeter level, and can be used for the accurate measurement of underwater complex surface drag.

Description

technical field [0001] The invention relates to the technical field of fluid mechanics experiments, in particular to a gravity-type circulating water tunnel used for drag reduction measurement of complex underwater surfaces. Background technique [0002] As we all know, water tunnel, as an experimental device for flow display and fluid measurement, can be used to study hydrodynamic phenomena such as boundary layer, laminar flow, turbulent flow, cavitation, flow around a cylinder, and hydroelasticity, as well as the performance of underwater vehicles. resistance measurement. In order to ensure the accuracy of the water tunnel during the measurement process, it is necessary to carry out structural optimization design, hydrodynamic design and power system design for the water tunnel. [0003] At present, the main components of circulating water tunnels at home and abroad are roughly the same, mainly including rectification section, contraction section, working section, diffusi...

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Problems solved by technology

[0004] However, the resistance measurement of underwater complex surfaces requires high flow uniformity, because once disturbed by the vibration of the power device, the results of complex surface resistance measurement will be greatly affected

At the same time, limited by the height of the experimental space and the flow control system, the existing gravity-type circulating water tunnel can only achieve a low flow rate (less than 1.0m / s), which cannot meet the requirements of a wide range of flow rates (0.01-1.80m / s). / s) Requirements for complex surface resistance testing

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