带前置预旋导轮的螺旋桨空泡脉动压力数值模拟研究

本文基于非定常粘性RANS方法结合Schnerr-Sauer空泡模型,建立了船后螺旋桨空泡脉动压力数值预报方法,并开展了数值方法的不确定度分析;然后采用ITTC'78自航预报规程结合CFD方法预报了带前置预旋导轮的节能效果,开展了安装节能导轮后的螺旋桨空泡脉动压力预报研究;对比分析了有无节能装置时的螺旋桨叶表面空泡形态及1阶和2阶船体脉动压力.研究表明,在本实例中安装节能装置后的1阶和2阶脉动压力分别下降了33％和20％,而桨叶表面空泡面积也有所下降.

Numerical Study of Pressure Fluctuation Induced by Propeller Cavitation with Pre-shrouded Vanes

A numerical method to predict the propeller cavitation and hull pressure fluctuation in the ship stern is set up in this paper by using unsteady viscous RANS approach and Schnerr-Sauer cavita?tion model. The numerical error or uncertainty is estimated with verification and validation method be?fore evaluation of the energy-saving performance at self-propulsion condition by using the revised ITTC'78 method. Then the hull pressure fluctuation induced by propeller cavitation is predicted with?out Pre-Shrouded Vanes (PSV, CMES-PSV). The numerical method is used to study the hull pressure fluctuation with PSV, which has five fins and a half duct. The cavity patterns and the amplitudes of the first and second blade frequencies (BF) of hull pressure fluctuation are compared. When PSV energy-saving device is used, the 1BF and 2BF pressure fluctuations decrease about 33％ and 20％ respec?tively, and the cavitation shape areas also decrease.