螺旋桨空泡与其诱导脉动压力同步观测试验研究

Experimental Study on Synchronous Observation of Propeller Cavitation and Induced Fluctuation Pressure

为了探究螺旋桨空泡与其诱导脉动压力的相关性,采用模型试验方法同步观测了某4叶螺旋桨空泡形态与脉动压力,给出了空泡形态变化与脉动压力时历信号的对应关系,解释了脉动压力信号波形的产生机制,分析了脉动压力信号与各阶叶频分量之间的关系。结果表明,脉动压力信号的波形不仅受各叶片扰动和空泡变化的影响,也受相邻叶片引起脉动压力的叠加影响。各桨叶扰动、空泡稳定演变、相邻叶片叠加和空泡体积脉动共同作用形成独特的空化螺旋桨脉动压力信号波形,决定其各阶叶频分量的分布。

In order to explore the correlation between propeller cavitation and its induced fluctuation pressure,model test is carried out to observe the cavitation morphology and its induced fluctuation pressure synchronously for a four-blade propeller.The correlation between cavitation morphology change and its induced fluctuation pressure signal is shown to explain the mechanism of fluctuation pressure signal waveform.The corresponding relationship between the signal of fluctuation pressure and each blade-frequency component is analyzed.The results show that the waveform of fluctuation pressure signal is affected not only by the disturbance and cavitation change of each blade,but also by the superposition of fluctuation pressure induced by the adjacent blade.The disturbance and stable cavitation of each blade,superposition of the adjacent blade,and cavitation volume fluctuation works together to form a unique signal waveform of fluctuation pressure induced by the propeller cavitation,which determines the distribution of each blade-frequency component.