非均匀来流条件下螺旋桨空化诱导噪声特性试验研究

Induced Noise Characteristics of Propeller Cavitation Under Non-Uniform Inflow Conditions

  • 摘要: 螺旋桨是船舶推进系统主要的噪声源,研究螺旋桨噪声对提高舰艇隐身性能具有重要意义. 针对船用大侧斜螺旋桨,在空泡水筒内开展螺旋桨空泡演化及其诱导噪声特性试验研究,探究螺旋桨典型空泡形态、空泡非定常演变及其诱导噪声特性. 试验结果表明,空化诱导噪声与空泡发展强相关,空化会显著增加噪声. 在空泡的初生和发展阶段,声压波动范围较小;在空泡脱落和溃灭阶段,噪声会出现明显的脉冲尖峰,声压波动范围较大. 由于存在周期性的空泡溃灭过程,叶背空化与梢涡空化并存阶段的声压脉冲尖峰呈周期性,脉冲尖峰频率与一倍叶频一致.

     

    Abstract: 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.

     

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