微型旋翼悬停状态气动性能分析方法

摘要

为了了解微型直升机工作时相关的气动知识,建立了一套微型旋翼悬停状态气动性能分析方法.该方法包含了低雷诺数下微型旋翼桨叶翼型的二维气动特性分析的CFD技术和旋翼气动特性分析的动量/叶素理论.对影响微型旋翼悬停性能的因素做了初步分析,合适的翼型弯曲、桨叶尖削等,有助于提高微型旋翼的最大悬停效率.文中还对分析的部分结果进行了试验验证.%In order to better understanding the relevant micro helicopter aerodynamics, a method for the prediction of micro-rotor hover performance is presented. The method combines the computational fluid dynamics (CFD) technique for two-dimensional parametric aerodynamic study of airfoils at low Reynolds numbers with the blade element momentum theory (BEMT) for the prediction of rotor hover performance. The predicted thrust and power of micro-rotor are in good agreement with experimental measurements. The investigation explores the influences of a series of parameters such as airfoil shape and blade plan form on the micro-rotor performance. Theoretical and experimental studies show that thin circular arc airfoil shape, tip tapered geometries and blade plan form with twist distribution will improve the maximum of micro-rotor hover efficiency.