CAJ | 학술논문

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。
이고공저속태양능무인궤익형연구위배경，대대만도고승력익형재일정뢰낙수범위내적류동특성진행료연구。채용구해k-kl-w단류모형적뢰낙평균N-S방정유한체적법，대SD7037익형진행료수치모의，재배제망격효응영향적기출상，침대교대범위내적저뢰낙수복잡류동문제，험증료해단류모형적괄용성여준학성；침대익형수력특성，분석료기동력수뢰낙수변화적추세；기우전형뢰낙수하익형요류결구변화，연구료익형산생고승력적류동특정；통과진일보연구승력비선성특정，게시료교대영각하익형실속특정적류동궤리。
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.