The Influence and Anslysis of Gas Content on the Pressure Fluctuation induced by Cavitating Propeller

Abstract

Abstract A ship hull model with all accessories is used to simulate the wake field of the propeller of a twin propeller ship in a large circulating water channel.The similarity of propeller wake field is guaranteed.The influence of air content in water on pressure fluctuation by cavitating propeller is studies.The cavity form of propeller was observed under the condition of different air content in water.The pressure fluctuations induced by cavitating propeller behind ship hull is also measured.The results showed that the air content has a significant influence on the pressure fluctuations. Each measuring points and each order frequency of pressure fluctuations amplitudes increase with the decrease of air content.The main reasons of influence of air content on pressure fluctuations are analyzed.It is proposed that how to set the air content in the model tests.