螺旋桨尾流场的数值计算方法

Numerical computation method of propeller wake field

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,逐步迭代直至螺旋桨的尾涡形状收敛。将这种方法计算得到的螺旋桨水动力性能和试验结果进行了比较分析,证明该方法可以提高螺旋桨水动力性能在非设计工况下的预报精度。

Induced velocity of surface source and dipole distribution is calculated by analytic formula. In the near field of surface dipole, the surface dipole is replaced by vortex ring. The wake surface is updated during iteration until convergence with the local velocities, i.e. by applying force-free condition on the wake surface. The method is validated to enhance precision of propeller hydrodynamics by comparing computing result with experiments.