基于CFD方法的阵风响应与阵风减缓研究  

Further Exploring CFD-Based Gust Response and Gust Alleviation

作　　者：许晓平[1] 祝小平[1] 周洲[1] 王军利[1] 

机构地区：[1]西北工业大学无人机特种技术国防科技重点实验室,陕西西安710072

出　　处：《西北工业大学学报》2010年第6期818-823,共6页Journal of Northwestern Polytechnical University

摘　　要：通过设计舵面的同期运动,可以达到缓解飞行器遭遇阵风时引起的非定常气动力与力矩干扰的目的。文章通过引入"网格速度"模拟阵风条件,求解非定常欧拉方程实现了翼型阵风响应的数值模拟;并通过动态嵌套网格方法研究了舵面运动时的阵风减缓效果。首先采用该方法对NACA0006翼型迎角阶跃型阵风的气动力响应进行了计算,计算结果与理论结果、文献计算结果吻合良好。进一步对NLR两段翼型在迎角阶跃型、One-m inus-cosine型阵风做用下的气动力响应过程进行了数值模拟,对襟翼运动时的阵风减载效果进行了分析,并研究比较了襟翼运动参数对阵风减缓的影响。结果表明:通过合理设计舵面运动方式,可以很好抑制阵风引起的非定常气动干扰。Aim.The introduction of the full paper,after reviewing a number of papers in the open literature that explore CFD（computational fluid dynamics）-based gust response,finds that Ref.3 is quite helpful for our further exploration.Sections 1 and 2 present the results of our further exploration.The core of section 1 is that we use the unsteady Euler equations and the grid velocity method to investigate the dynamic response of the airfoil in vertical gust flow perturbation and to investigate the gust influence.Section 2 studies the rudder movement of gust unloading effect.Its core consists of：（1） we apply the grid velocity method to simulating the gust response of the typical NACA0006 airfoil to the step changes in the angle of attack of aircraft;（2） we analyze the gust response of the one-minus-cosine gust profile and gust-caused step changes in the angle of attack of the NLR airfoil;we use the moving flap to study the dynamic gust load alleviation and the flap motion parameters to show the gust alleviation effects on the aerodynamic performance;（3） the simulation results are given in Figs.3 and 4,Figs.6 through 11 and Table 1.The simulation results and their analysis show preliminarily that：（1） the lift response of the airfoil agrees well with both the exact theoretical values and the calculated values in Ref.3;（2） the rudder movement designed by using our method can effectively alleviate the freestream gust fluctuation and ensure good flight performance.Our exploration work has not yet fully considered the actual gust conditions and further exploration is necessary.

关 键 词：阵风响应 阵风减缓 气动特性 非定常 数值模拟 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]