全方向推进器主要参数对其水动力性能的影响

Prediction of unsteady variable vector propeller performance by panel method

为优化全方向推进器的模型设计,采用面元法分析全方向推进器主要参数的变化对非定常水动力性能的影响.基于螺旋桨面元法理论建立了全方向推进器的非定常水动力性能计算的数学模型,进行了数值预报,采用关于扰动速度势的基本积分微分方程,以双曲面元消除面元间的缝隙,在桨叶随边满足压力Kutta条件.应用Morino解析公式计算面元的影响系数,用Yanagizawa方法求得物体表面上的速度分布.分析了全方向推进器主要参数对水动力性能的影响.计算结果表明,周期螺距角的值对全方向推进器的非定常水动力性能起决定性作用.该文的计算结果可以作为下一步试验研究的基础.

To improve the model design of the variable vector propeller, the method for predicting the unsteady hydrodynamic characteristics of variable vector propeller by the panel method and the mathematical models for evaluation based on panel method are presented. The prediction of hydrodynamic characteristics is provided numerically. The hyperboloidal quadrilateral panels are used to avoid gap between panels. The pressure Kutta condition is satisfied on the trailing edge of a propeller blade. The influence coefficients of panels are calculated by Morino＇ s analytical formulations and the method developed by Yanagizawa is used to determine the velocities on the propeller surface. The influence of main parameters, including the expended area ratio, number of blades, collective pitch angle, section shape, cyclic pitch angle and rake angle on the unsteady performance of VVP, is analyzed. The calculation result shows that the unsteady performance depends on the value of cyclic pitch angle and can be applied to the research of the model test.