非均匀来流下螺旋桨空泡脉动压力特性研究

In order to study the propeller cavitation and induced pressure fluctuation in non-uniform wake, a multi-field synchronous measurement system was used to carry out tests in a cavitation tunnel for a highly skewed propeller (HSP) and explore the influence of advance coefficient and cavitation number on the propeller cavitation performance and fluctuating pressure characteristics. The results show that the propeller cavitation appears in the test mainly in three types: back cavitation, face cavitation and tip vortex cavitation. Low-frequency pressure fluctuation is highly correlated to the cavity volume oscillation. Under non-cavitation condition, the first blade passing frequency is the main component of pressure fluctuation while the amplitude of higher blade passing frequency component can be ignored by comparing the contributions of each blade passing frequency component of the whole pressure fluctuation. Under cavitation condition, the unsteady cavitation has a great impact on the pressure fluctuation. The higher blade passing frequency components can be obviously observed, and the amplitude of main frequency pressure fluctuation increases significantly.The variation of pressure will become more observable with the increase of intensity of cavitation evolution process. The higher order blade frequency component of pulsating pressure increases obviously when tip vortex cavitation is present.