关键词: 变弯度机翼, 六参数化方法, 气动优化, 遗传算法, 拓扑优化

Abstract: A stepwise optimal design of aerodynamic shape and structural topology is proposed to meet the requirements of aero-dynamic optimization and lightweight design for variable camber wings. Based on the results of aerodynamic optimization, the topology optimal structure of the leading and trailing edge of the wing is established by the variable density method. A six-parameter parameterization method is proposed to describe the wing shape, and local correction is performed using B-spline curve and the aerodynamic shape is optimized by the genetic algorithm. Based on the optimized aerodynamic shape of the wing, a variable density topology optimization algorithm is employed to establish a RAMP interpolation model, the leading and trailing edge topology structures and wing spanwise models are designed. Using 3D printing technology, the topology structure of variable camber wing with the leading and trailing edge is processed and the deformation tests are conducted. The aerodynamic simulation results show that the deformation range of a six parameter variable curva-ture airfoil is maximum and its shape is continuous and smooth. Compared with the basic airfoil, the lift-drag ratio of the optimized wing increases by 35.7% during take-off and by 4.4% during cruise. The deformation test results show that experimental results show that the equivalent deflection angles of leading edge and trailing edge are respectively 9.37 ° and 9.18 ° , and the deflection effect is significant, which verifies the feasibility of stepwise optimization of aerodynamic shape and topology.

Key words: variable camber airfoil, six-parameterization method, aerodynamic optimization, genetic algorithm, topology optimi-zation