太阳能无人机低雷诺数翼型气动特性研究  

Studying Aerodynamic Performances of the Low-Reynolds-Number Airfoil of Solar Energy UAV

作　　者：王科雷 周洲[1] 甘文彪[1] 许晓平[1] 

机构地区：[1]西北工业大学无人机特种技术重点实验室,陕西西安710065

出　　处：《西北工业大学学报》2014年第2期163-168,共6页Journal of Northwestern Polytechnical University

基　　金：西北工业大学基础研究基金(JCT20130110)资助

摘　　要：以高空低速太阳能无人机翼型研究为背景,对大弯度高升力翼型在一定雷诺数范围内的流动特性进行了研究。采用求解k-kl-w湍流模型的雷诺平均N-S方程有限体积法,对SD7037翼型进行了数值模拟,在排除网格效应影响的基础上,针对较大范围内的低雷诺数复杂流动问题,验证了该湍流模型的适用性与准确性;针对翼型受力特性,分析了气动力随雷诺数变化的趋势;基于典型雷诺数下翼型绕流结构变化,研究了翼型产生高升力的流动特征;通过进一步研究升力非线性特征,揭示了较大迎角下翼型失速特征的流动机理。In order to develop high attitude and low speed solar energy UAV, numerical computations of airfoil were used to analyze the aerodynamic characteristics of high-lift airfoil with high camber in a range of low Reynolds num-ber. Finite volume method and transition k-kl-w turbulence model were used to solve the 2D Reynolds-averaged Navier-Stokes equations. To prove the accuracy of this method, the SD7037 airfoil was selected to undergo an anal-ysis of influences caused by different types of grids and undergo a verification between the numerical results and ex-perimental results. We conducted a detailed analysis of aerodynamic forces and summarized their trends of variation with Reynolds number, then studied the characters of the flow at representative Reynolds numbers and explained the reasons of high lift, and at last, through studying the nonlinear characteristics of the lift discussed the flow mechanism of the stall of the airfoil at large relative angle of attack.

关 键 词：低雷诺数 气动性能 流动机理 非线性 失速 分离 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]