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《Engineering Mechanics》 2017-12
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THE EFFECT OF SCALE ON THE THRUST CHARACTERISTICS OF UNDERWATER SYNTHETIC JET

GENG Ling-bo;HU Zhi-qiang;LIN Yang;YI Rui-wen;WANG Chao;The State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences;University of Chinese Academy of Sciences, School of Engineering Sciences;  
The thrust characteristics of underwater synthetic jet under different scales are numerically studied. The commercial code fluent is used for the numerical simulation. The numerical results are validated using experimental data. The numerical results show that when the scale is 0.1 mm, the variation of the thrust is close to that of the velocity. The average thrust and the propulsion efficiency is low on this scale. When the scale increases to 1 mm, the thrust becomes asymmetrical and both the average thrust and the propulsion efficiency are increased. A mathematical model of underwater synthetic jet is established. The model decomposes the thrust of underwater synthetic jet into three parts: the thrust induced by mass change, the thrust induced by fluid acceleration and the thrust caused by the pressure of the fluid outside the actuator. The vortical structures and the velocity distribution under different scales are given. The analysis of the flow field reveals that the viscous effect differs significantly for different scales. When the viscous effect is strong, the fluid acceleration and the pressure effect of the outside fluid is very weak. As a result, the efficiency of the actuator is low. With the increase of the size, the viscous effect is greatly reduced. The fluid acceleration and the pressure effect of the outside fluid increase, resulting in a larger efficiency.
【Fund】: 国家重点研发计划课题项目(2016YFC0301601);; 中国科学院青年创新促进会项目
【CateGory Index】: O358
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