空气动力学学报2017，Vol.35Issue(1)：62-70,9.DOI:10.7638/kqdlxxb-2015.0183
S1223翼型俯仰-沉浮运动的非定常气动特性分析
Numerical study of the phunging-pitching motion of S1223 airfoil
摘要
Abstract
Flapping-wing micro air vehicle (FMAV)is one of the most important research directions of future aviation.The bird or insect in nature possess the advanced ability of flying because of thousands of years'evolution,so the study of their flight kinematics as well as flow mechanism can greatly contribute to the development of FMAV.To investigate the unsteady aerodynamic mechanism of flapping wing,simplified plunging/pitching motion of a rigid 2-D S1223 airfoil is firstly taken into consideration.Numerical method is based on the hybrid dynamic mesh technique and unsteady flow solver.To improve the moving ability of dynamic mesh,the radius basis function is used to calculate the displacement of volume nodes.For unsteady flow solver on moving mesh,geometric conservation law is satisfied by constraining the normal velocity of cell surface.Second-order finite volume method is used.Dual-time stepping method and BLU-SGS implicit scheme are adopted for time marching.The unsteady lifts,thrusts as well as power consumptions with different flapping parameters are abtained.The flow mechanism for lift and thrust is studied.The influence of down-stroke time ratio and stroke angle is analyzed, which would greatly influence the aerodynamic performance and the power consumption.Numerical results show that the 'static effect'of the airfoil plays the main role for lift generation.Meanwhile,the unsteady flow induced by the plunging/pitching motion can enhance the lift by weakening the flow separation and increasing the equivalent angle of attack.The maximum lift per power consumption can be got when down-stroke time takes about 65%-70% of the whole stroke cycle,which agrees well with observation data.Further,a set of appropriate flapping angles are specified based on these analyses, which would greatly contribute to the realistic 3-D simulations in the future.关键词
鸟类扑翼/动态混合网格/非定常流动/RBF动网格方法/几何守恒律Key words
flapping wing/dynamic hybrid mesh/unsteady flow/radius basis function/geometric conservation law分类
航空航天引用本文复制引用
常兴华,马戎,张来平,赫新..S1223翼型俯仰-沉浮运动的非定常气动特性分析[J].空气动力学学报,2017,35(1):62-70,9.基金项目
国家自然科学基金(11532016、11672324) （11532016、11672324）
国家重点研发计划(2016YFB0200701) （2016YFB0200701）
