结构参数对局部弹性翼型气动性能的影响规律  

Influences of Local Flexible Airfoil Parameters on Aerodynamic Performance

作　　者：雷鹏飞[1] 张家忠[1] 贾艳俊 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]陕鼓动力股份有限公司,西安710075

出　　处：《西安交通大学学报》2014年第6期110-116,共7页Journal of Xi'an Jiaotong University

基　　金：国家"973计划"资助项目(2012CB026002);国家"863计划"资助项目(2012AA052303)

摘　　要：采用数值方法研究了低雷诺数下局部弹性翼型结构参数对翼型性能及流动结构的影响。建立了局部弹性结构的振动模型,采用具有双时间步长的任意拉格朗日-欧拉方法和基于特征线的算子分裂法对非定常流固耦合问题进行数值模拟,对不同的结构密度、弹性模量、阻尼下局部弹性翼型的升力以及结构振动的频率特性进行了分析。研究结果表明:局部弹性结构自激振动对流动的控制存在最佳的振动频率范围;在合适的结构参数下,如较小的结构弹性模量和结构阻尼,局部弹性结构能够产生较大振幅的自激振动,从而改变流动结构并提高翼型升力;对于具有高升力的局部弹性翼型,结构振动能够显著改变非定常流动分离模式,减小分离区域,达到抑制分离、提高翼型升力的效果。The influences of structure parameters of airfoil with local flexible structure on the performance and flow structure under low Reynolds number are investigated numerically.The local flexibility model is established,the unsteady fluid-structure interaction is simulated by arbitrary Lagrangian-Eulerian method （ALE） and characteristic-based split （CBS） scheme with dual time step.The results indicate that there is an optimal range of oscillation frequency and amplitude,at which the airfoil lift can be enhanced remarkably.With proper structure parameters,such as small elasticity modulus and structural damping,the coupling between structure and fluid leads to large amplitude oscillation to change the flow structure and to enhance lift.For the cases with high lift enhancement,the structure oscillation facilitates changing flow pattern and reducing separated region to suppress flow separation and enhance airfoil lift.

关 键 词：局部弹性 自激振动 双时间步长 结构参数 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]