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首页> 外文期刊>Aerospace science and technology >Aerodynamic shape optimization of hovering rotor blades using a cotmled free wake-CFD and adioint method
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Aerodynamic shape optimization of hovering rotor blades using a cotmled free wake-CFD and adioint method

机译：使用自由交织的自由尾流CFD和adioint方法优化悬停转子叶片的空气动力学形状

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This paper concerns a numerical optimization method for designing helicopter rotor blades in hover based on adjoint method and by using a coupled free wake-CFD approach for proper calculation of aerodynamic loads. The Euler flow solver and adjoint equations are formulated in a rotating coordinate system. The rotor wake effects are modeled by a free wake method and included into the CFD calculation. The approach is applied for the redesign of a transonic Caradonna-Tung two-bladed rotor through minor surface changes. The inviscid torque was reduced about 15% from that of original rotor due the reduction of wave drag. Results show that this technique is capable of converging to the optimum aerodynamic shape of rotor blades with minimum inviscid rotor torque coefficient under fixed thrust constraint. The advantage of this method is that satisfactory results can be achieved by minimum computational efforts, Darticularlv for the erid generation Droblem and the reauired CPU time.
机译：本文涉及一种基于伴随方法并利用耦合自由尾流CFD方法设计悬停直升机旋翼桨叶的数值优化方法，以正确计算空气动力载荷。欧拉流量求解器和伴随方程式在旋转坐标系中表示。转子的尾流影响通过自由尾流方法建模，并包含在CFD计算中。该方法适用于通过较小的表面变化重新设计跨音速的Caradonna-Tung两叶转子。由于减小了波浪阻力，因此无粘性扭矩比原始转子降低了约15％。结果表明，该技术能够在固定推力约束下以最小的无粘性转子转矩系数收敛到最佳的转子叶片空气动力学形状。该方法的优点是，通过最少的计算工作即可获得令人满意的结果，而Darticularlv则适用于错误的Droblem生成和所需的CPU时间。

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