非均匀来流条件下螺旋桨空化诱导噪声特性试验研究

As the main noise source of ship propulsion system，propeller noise should be studied particularly to improve ship acoustic stealth performance and reducing ocean noise pollution. Aiming at the high-skew propeller for marine use, a test analysis was arranged within a cavitation tunnel to study the evolution of propeller cavitation and its induced noise characteristics, and to explore the typical cavitation morphology, unsteady evolution of cavitation and the induced noise characteristics of the propeller cavitation. The test results show that cavitation-induced noise is strongly correlated with cavitation development, and cavitation can significantly increase noise. A small fluctuation range of sound pressure appears in the initial and development stage of cavitation, and the obvious peak of the noise pulse appear in the stage of cavity shedding and collapse with large sound pressure fluctuation range. Due to the periodic cavitation collapse process, the peak of sound pressure pulse is periodic in the coexisting stage of suction side sheet cavitation and tip vortex cavitation, and the pulse peak frequency is consistent with the 1 times blade frequency.