摆线桨悬停状态气动特性及参数优化

为了进一步提高摆线桨的气动效率，本文对摆线桨的设计参数进行了优化研究。首先分析了流管模型的基本原理，基于薄翼振荡原理，结合动量和叶素理论建立了摆线桨的双盘-多流管非定常气动模型。然后，通过相关算例验证了模型的适用性，结果表明：实度较小时，准确度较高，而随着实度与转速的增加，桨叶之间的干扰加强，误差值增大。通过大量试验与计算数据的对比，总结了不同实度时，多流管模型的拉力修正因子。最后，基于双盘-多流管气动模型，应用遗传算法对摆线桨的相关设计参数进行了优化设计，优化后的功率载荷提高了12.4%左右。同时，对比发现优化后的摆线桨比旋翼具有更高的气动效率。

Aerodynamic Performance and Parameter Optimization of Cycloidal Rotor at Hover

In order to further improve the aerodynamic efficiency of cycloidal rotor, its design parameters are optimized. Firstly, the basic principles of tube model for the cycloidal rotor are analyzed. Based on the theory of thin-aerofoil oscillation, an unsteadily aerodynamic dual disk multi-flow tube model for the cycloidal rotor is established by combining the momentum with the blade element theory. Then, the model applicability is verified with relevant examples. The results show that the accuracy is relatively high when the solidity is relatively low, and error value is increased as the interference among the blades is strengthened because of the increasing solidity and rotation speed. The thrust correction factor of the multitube model at different solidity is summarized via the comparison between a large number of experimental and computational data. Finally, based on the dual disk multi-flow tube aerodynamic model, the genetic algorithm is used to carry out the optimization design for the relevant design parameters of cycloidal rotor. The power load after optimization is increased by 7.9%. Meanwhile, it is found that the optimized cycloidal rotor has the higher aerodynamic efficiency than the rotor.