螺旋桨飞机超低空流场数值模拟方法研究

发展了一种考虑地面效应和螺旋桨滑流的超低空螺旋桨飞机流场的高效计算方法。利用非结构网格技术生成螺旋桨飞机含地面效应的空间网格,基于代数方法实现了不同地面高度下近地面层状等高三棱柱网格的拓展,保证了网格的生成效率。通过在螺旋桨旋转平面建立滑流边界条件,利用数值方法求解可压缩Euler方程得到流场,避免了精确模拟螺旋桨高速旋转计算量大的问题,大大提高了计算效率。分别研究了地面效应和螺旋桨滑流对气动力的影响,给出了气动性能参数的变化规律,并与实验值进行了比较。结果表明:该文计算方法是可行的并具有较高精度,可为螺旋桨飞机的设计提供技术支持。

RESEARCH ON NUMERICAL SIMULATION METHOD OF PROPELLER-DRIVEN AIRCRAFT FLOW FIELDS AT LOW ALTITUDE

A high efficient numerical simulation method of propeller-driven aircraft flow fields at low altitude is developed through the consideration of the influence of ground effect and prop slipstream on aerodynamics. The computed space meshes with ground effect of a propeller-driven aircraft are established with an unstructured meshing technology. The prismatic meshes with the same height near ground are joined to space meshes at different ground height using an algebraic method, being high efficient for creating meshes. The slipstream boundary condition is imposed on the surface swept by prop, and the flow fields of the propeller-driven aircraft are calculated by solving compressible Euler equations with numerical method. The method avoids mass calculation of simulating the prop circumrotating with high velocity and improves computing efficiency greatly. The influence of ground effect and prop slipstream on aerodynamics is investigated and the variety regularity of aerodynamic performance parameters is obtained. The numerical calculation results are compared with experimental ones. Results indicate that the present method is feasible and efficient, and can provide technical support for propeller-driven aircraft design.