螺旋桨空泡的数值分析

螺旋桨空泡会降低螺旋桨性能,产生空化剥蚀和噪声,从而导致船体振动.文章采用基于速度势的低阶面元法对螺旋桨水动力性能和空泡的范围及厚度进行求解,分别用Morino提出的Kutta和等压Kutta条件对压力分布进行计算,讨论了两种Kutta条件对压力分布的影响.计算了空泡产生后的压力分布,验证了在空泡表面上的压力等于水的汽化压力.对空泡起始点对空泡形状的影响进行了研究,结果表明,空泡起始点对空泡范围有很大影响,空泡起始点离导边越远,空泡范围越小.

Numerical analysis of propeller cavitation

Propeller cavitation degrades propeller performance,erodes blade surfaces,produces noise,and causes vibration on the ship hull.The open water performance of a propeller and the range and thickness of propeller cavittation were solved by a low-order surface-panel method based on velocity potential.The pressure distribution was computed by Morino's Kutta condition and pressure Kutta condition.The pressure distribution on the blade surface including cavity surface was calculated.It is validated that the pressure on cavity surface is equal to the vapor pressure of water.The influence of cavity detachment location on cavity form was studied.The results indicate that cavity detachment has great influence on the cavity range and thickness.The cavity range decreases with the distance increasing from detachment point to the leading edge.