共轴双旋翼悬停状态气动参数优化计算

摘要

This paper presented a methods which optimal coaxial rotor geometry be calculated in hover.The aerodynamic loads were solved by blade element momentum theory(BEMT) with mutually induced inflow.Nonlinear program based on computational procedures of aerodynamic load was developed,to solve it by spare sequential Quadratic programming(SQP).The result of this methodology represented that when coaxial rotor thrust coefficient is ,CT=0.004,the rotor power coefficient based on linear or nonlinear twist is no difference,however figure of merit of coaxial system can be improved significantly by 18.4%,which optimal chord distribution on coaxial rotor system.%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.