可调螺距螺旋桨水动力性能分析

利用面元法分析可调距螺旋桨的水动力性能.计算过程中,采用较为简捷的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的间隙,Newton-laphson迭代过程被用来在桨叶随边满足压力Kutta条件,使桨叶上下表面的的压力在随边有良好的一致性,同时用模拟物体真实行状的面元法来解决调距桨在螺距变化时的叶剖面畸变的问题.用Morino导出的解析计算公式来计算面元的影响系数,加快了数值计算的速度.以无厚度线性尾涡模拟桨叶泄出涡.调距螺旋桨最佳转轴位置由理论方法求出,使得桨叶的转叶矩为零.计算过程中计入了桨毂的影响,并分析了桨毂对桨叶表面压力分布的影响.最后给出了调矩螺旋桨水动力性能随随螺距的变化规律,并和试验结果作了比较分析.

Hydrodynamic force performance analysis of controllable pitch propeller

The potential based panel method is used to analyze the hydrodynamic force performance of controllable propeller. In present method the equation based on potential achieved from Green formula was solved by distribute the hyperboloidal quadrilateral panels on blades, boss and wakes to avoid gaps between the panels. The pressure Kutta condition is satisfied on trailing edge of propeller blade by Newton-Laphson iterative procedure. Therefore the pressure coefficients of the suction and pressure faces of blade are equal on trailing edge. The influence coefficients of panels are determined by Morino's analytical formulations to increase numerically calculating speed. The wake was simulated by free vortex without thickness. Optical spin axis of the blade is calculated by an effective method so that the total torques around it should be zero. The influence of boss is contained in the computing process and further to analyze the influence of boss on pressure distribution of the blade. The hydrodynamic changing trend of controllable pitch propeller according to the variety regulation of the pitch is achieved and compared with the experimental result to verify the present method.