螺旋桨梢涡卷起数值计算

Numerical computation method of propeller tip-vortex roll-up

通过解析公式计算得到面源和面偶的诱导速度,在面偶附近区域,用涡环代替面偶,计算得到螺旋桨的速度场,根据尾涡面必须和当地流体流速相切的原则,修正原来尾涡面的形状,逐步迭代直至尾涡形状收敛,用这种方法预报了三维水翼和螺旋桨的尾涡面的形状和梢涡卷起,与试验结果有较好的一致性。

The induced velocity near field of the surface dipole, updated until convergence with of surface source and dipole was calculated by analytic formula. In the the surface dipole is replaced by vortex ring. The wake surface was the local velocities, by applying force-free condition on the wake sur- face. The method was applied to predicting 3D hydrofoil and propeller wake surface and tip vortex roll-up. The results of experiments prove that this method is feasible.