An Experimental Study on Pressure Fluctuation and Noise Induced by Tunnel Thruster

作者：Dong, Xiaoqian; Yu, Cheng; Yang, Chenjun

来源：Ship Building of China, 2017, 58(3): 1-13.

• Fluctuating pressures
• Fluctuation pressure
• Model tests
• Noise
• Pressure fluctuation
• Sound pressure level
• Structural vibrations
• Tunnel thrusters

Cavitation occurs more easily on tunnel thruster blades than on an open propeller due to the small tip clearance and heavy loads, which make serious structural vibration and noise radiation. In this paper, model experiments have been conducted for a tunnel thruster model in the cavitation tunnel in Shanghai Jiao Tong University. Influences of flow speed, impeller's rotation speed and cavitation number on fluctuating pressures on the tunnel wall and radiated noise are investigated. Experimental results indicate that influence of flow and impeller's rotation speed on the coefficient of fluctuation pressure is negligible. Both The amplitude of pressure fluctuation and sound pressure level are higher in the cavitating condition than in the non-cavitating one. The pressure fluctuation on the impeller disk becomes strong as the cavitation number decreases, whereas the noise does not.

• 出版日期2017
• 单位上海交通大学