基于非定常涡格法的扑翼飞行器气动特性优化

旨在为柔性扑翼飞行器的翼面选型与设计提供一定依据,研究其气动优化.建立了扑翼的非定常涡格法(UVLM)尾涡模型；采用面向对象的编程技术对该模型进行求解并引入GPU流式编程技术实现了UVLM并行计算,使其执行效率提高了3倍；以升力和推力的最大化为目标,并采用模式搜索法对扑翼的扑动与俯仰运动相位差、扑动频率与柔性扭转角以及翼面结构进行了优化.结果显示,要获得尽可能大的气动推力,翼面应设计成倒梯形且其外翼段应具较大面积,要使升力最大化则需将翼面设计成正梯形布局并应使内翼段面积较大；为进一步提高FMAV推力,应在增大扑动频率的同时适当减小翼面的柔性扭转角.研究表明,内嵌UVLM的模式搜索法可望成为FMAV气动优化的一个重要工具.

Optimization of the aeroydnamics of the flapping-wing based on unsteady vortex lattice method

In order to develop theoretical instructions for the design of flapping wing macro aviation vehicle(FMAV),the aerodynamic optimization of the FMAV has been studied.Firstly,an FMAV wake vortex model for the Unsteady Vortex Lattice Method(UVLM) is proposed.Then,a visual program based on object-oriented technique is developed for this method.Furthermore,by utilizing the parallel processing capability of GPU,the iteration on the UVLM model is optimized,which results in the computation time savings being up to 3/4.Finally,by embedding the UVLM to the Pattern-Search method,the elementary optimization of geometry shape of flapping wing and the flapping parameters have been accomplished.The results show that the shape of the wing should be designed as inverted structural trapezoid which is of larger area in its outer wing section so that larger air thrust could be produced.On the contrary,the wing should be designed as positive trapezoid and of larger area in its inner wing section if larger air lift is desired.In order to improve the air thrust,it should increase the flapping frequency and decrease the flexible twist angle.It is concluded that the Pattern-Search method,which embeds UVLM to carry out iterative aerodynamic calculation,is an available method for the FMAV optimization.