附鳍吊舱推进器的水动力性能分析

为了分析鳍对吊舱推进器水动力性能的影响,用基于速度势的低阶面元法预报附鳍吊舱推进器的定常水动力性能.螺旋桨和吊舱及鳍之间的相互影响通过迭代计算来处理,螺旋桨的诱导速度及吊舱和鳍的诱导速度均进行周向平均.采用关于扰动速度势的基本积分微分方程,并采用双曲面形状的面元以消除面元间的缝隙.Newton-Raphson迭代过程被用来在桨叶随边满足压力Kutta条件.用柳泽(Yanagizawa)方法求得物体表面的速度分布.计算了无鳍、单鳍和双鳍拖式吊舱推进器的水动力性能.计算结果表明,鳍可以回收螺旋桨尾流的旋转能量,使附鳍吊舱推进器的水动力性能提高,双鳍时效率最高,单鳍次之,无鳍最低.

Hydrodynamic performance analysis of a podded propeller with fins

In order to analyze the influence of fins,a low-order panel method based on velocity potential was used to predict the steady hydrodynamic performance of a podded propeller with fins.The mutual interaction between the propeller and the pod with fins was determined by iterative calculation,while the induced velocity caused by pod and fins was averaged in the circumferencial direction.To solve the velocity potential,we used an integro-differential equation.We also used a hyperboloidal panel to eliminate the gaps between the panels.The Newton-Raphson iterative procedure was employed at the trailing edge to satisfy the Kutta pressure conditions.The Yanagizawa method was utilized to evaluate the velocity distribution on the surfaces.The hydrodynamic performance of pod propellers with a single fin and double fins was calculated and the results indicated that the fin reclaims energy induced by the propeller so as to improve its hydrodynamic behavior.For this improvement,the podded propeller with two fins is best,that with a single fin is second,and a pod without a fin was the baseline.