基于CFD的螺旋桨拉力确定方法

针对螺旋桨拉力确定问题,以某型螺旋桨飞机为研究对象建立3维实体模型,采用CFD方法进行数值计算。利用分区拼接网格对螺旋桨及飞机短舱复杂组合体进行分块处理;在此基础上基于滑移网格方法,采用雷诺平均NS(RANS)湍流模型,针对不同高度、来流速度及桨叶角进行仿真计算。根据计算结果分析螺旋桨飞机流场特性,并以螺旋桨拉力为重点,总结了螺旋桨工作特性随飞行Ma和飞行高度的变化规律。结果表明:螺旋桨拉力随飞行Ma的增大而减小,随着桨叶角的增大而增大,可为后续涡轮螺旋桨发动机总净推力的确定方法提供技术支撑。

Determination Method of Propeller Thrust Based on CFD

Aiming at the problem of propeller thrust determination,a three-dimensional solid model was established with a certain propeller plane as the research object,and CFD method was used for numerical calculation.The block of the complex combination of propeller and nacelle was carried out by subarea patched-grid.On this basis,the Reynolds Mean NS(RANS)turbulence model was used to simulate the different height,flow velocity and blade angle based on the sliding grid method.Based on the calculation results,the characteristics of propeller plane flow field were analyzed,and the variation of propeller working characteristics with flight Ma and flight height was summarized with the emphasis of propeller thrust.The results show that the propeller thrust decreases with the increase of flight Ma and increases with the increase of blade angle,which can provide technical support for the determination method of turboprop total net thrust.