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基于动量叶素理论(BEMT),计入共轴双旋翼的线性气动干扰模型,建立轴流状态下的气动布局参数非线性规划模型,采用二次序列规划算法(SQP)进行优化计算。结果表明共轴双旋翼拉力系数CT=0.004时,线性、非线性扭转的需用功率基本无差别;基于Harrington旋翼2,弦长优化能够有效提升旋翼悬停效率。
Based on the momentum valence element theory (BEMT), a linear aerodynamic interference model of co-rotating twin rotor is taken into account and a nonlinear programming model of aerodynamic layout parameters under axial flow condition is established. The quadratic sequence programming (SQP) algorithm is used to optimize the model. The results show that the required power of linear and nonlinear torsion is almost the same when the coefficient of co-axial tension coefficient CT = 0.004. Based on the Harrington rotor 2, the chord length optimization can effectively improve the rotor hovering efficiency.