螺旋桨水动力性能的数值预报方法

基于速度势的低阶面元法预报螺旋桨的水动力性能。选用四边形双曲面元对桨叶进行离散以消除面元间的缝隙,基本积分方程由格林公式导出。在面元上布置等强度源汇和偶极子。采用线性尾涡并在每个尾涡面元上布置等强度的偶极子。利用Newton-Raphson迭代过程满足桨叶随边非线性等压kutta条件,使桨叶上下表面的压力在随边处一致。利用Morino计算影响函数的解析公式,采用Yanagizawa方法求得物体表面上的速度分布,并对普通桨和大侧斜桨进行了数值预报。

Numerical Prediction about Hydrodynamic Performance of Propeller

The hydrodynamic performance of the propeller can be predicted by means of low order surface panel method based on the velocity potential.The blade of the propeller is divided into a number of small hyperboloidal quadrilateral panels to avoid the gap between panels.The basic equation is achieved from Green formula.Constant sources and dipoles can be arranged on the discrete panel.Constant dipoles are arranged on every small trailing vortex surface in discrete way.The Kutta pressure condition is satisfied on the trailing edge of the blade in Netwon-Raphson iterative procedure.The pressure coefficients of the suction and surfaces of the blade can be equal on the trailing edge.The formula of the influence function is determined with Morino method.The velocity distribution on the surface is achieved with Yanagizawa method.The data are then predicted for the common propeller and the highly skewed propeller.