直升机旋翼翼型高效优化设计方法

The adjoint-based design optimization method of rotor airfoil is inefficient in combination with a dual time stepping method，making it difficult to meet the optimization requirements of multi-point and multi-objective optimization in engineering. Considering the problem of unsteady optimization design of rotor airfoil，coupled with efficient time spectral method and multigrid method，a multi-point and multi-objective optimization design method suitable for multiple motion states of helicopter，such as hovering，forward flight and maneuvering，was developed. The Navier-Stokes equation and adjoint equation were solved by using the time spectral method to discretize the physical time term. In addition，the multigrid method was used to improve the optimization efficiency. The rotor airfoil NACA0012 and OA209 were selected to carry out multi-point，multi-objective steady and unsteady optimizations. The results showed that the static and dynamic aerodynamic shape optimization design methods had high accuracy，and can realize the multi-point and multi-objective optimization design of rotor airfoils under complex motion states; compared with dual time stepping and adjoint-based design optimization method，the time spectral and adjoint-based design optimization method can improve the calculation efficiency of airfoil optimization by more than 5 times.