摘要
首先基于嵌套网格发展了一套适用于三维扑翼研究的非定常雷诺平均Navier-Stokes(RANS)方程数值模拟方法。为了解决微型扑翼在低马赫数下的收敛问题,使用了预处理方法,湍流模型为BL模型。在该方法的基础上,保持状态参数和扑翼表面形状一定的情况下,分别研究了一系列不同厚度、不同弯度的翼型对于微型扑翼气动特性的影响。研究结果表明,翼型的厚度对微型扑翼的升力影响很小,而较厚的翼型由于前缘吸力较大所以阻力较小。适当弯度的翼型可以改善扑翼的气动特性,达到增升减阻的目的,但翼型弯度不宜过大。本文的研究结果对于微型扑翼飞行器的翼型设计具有参考和指导意义。
Firstly this paper presents a numerical method to study the 3D flapping wing.The numerical method is solving preconditioned Reynolds-averaged Navier-Stokes（RANS） equations based on chimera grid method coupled with Baldwin-Lomax turbulent model.Then,it focuses on the effect of airfoil to the aerodynamics characteristics of flapping wing.Keeping the same wing shape and state parameters,the different thickness and camber of airfoils are simulated respectively.Study shows that the thickness has little effect on the lift force but increasing thickness can decrease the drag force for the leading edge suction.Certain camber of airfoil can improve the aerodynamics characteristics of flapping wing,increasing the lift force or decreasing the drag force.But too big camber will make bad effect.The results of this paper are useful to the airfoil design of flapping wing.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2011年第2期214-220,共7页
Chinese Journal of Computational Mechanics
基金
国防预研资助项目
关键词
扑翼
翼型
厚度
弯度
RANS方程
嵌套网格
flapping wing
airfoil
thickness
camber
RANS equations
chimera grids
