关键词: 变弯度机翼, 6参数化方法, 气动优化, 遗传算法, 拓扑优化

Abstract:

A stepwise optimal design of the aerodynamic shape and structural topology is proposed to meet the requirements of aerodynamic optimization and lightweight design for variable camber wings. Based on the results of aerodynamic optimization， we establish the topology optimal structure of the leading and trailing edge of the wing using the variable density method. A six-parameter parameterization method is proposed to describe the wing shape， local correction is performed using the B-spline curve， and the aerodynamic shape is optimized by the genetic algorithm. Based on the optimized aerodynamic shape of the wing， we employ a variable density topology optimization algorithm to establish an RAMP interpolation model， and design the leading and trailing edge topology structures and wing spanwise models. Additionally， using 3D printing technology， we process the topology structure of the variable camber wing with the leading and trailing edge， and conduct deformation tests. The aerodynamic simulation results show that the deformation range of a six parameter variable curvature airfoil is the largest with a continuous and smooth shape. Compared with the basic airfoil， the lift-drag ratio of the optimized wing increases by 35.7% and 4.4% during take-off and cruise， respectively. The deformation test results show that the equivalent deflection angles of the leading edge and trailing edge are 9.37° and 9.18°， respectively， with significant deflection effect， verifying the feasibility of stepwise optimization for the aerodynamic shape and topology.

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