基于POD的尾流激励叶片气动力降阶模型

Reduced Order Aerodynamic Model of Wake Excited Blade Based on POD

提出了本征正交分解法方法建立叶片气动力降阶模型,快速分析叶片气动特性。采用计算流体力学得到气动力快照矩阵,然后利用本征正交分解法获得尾流激励下的叶片气动力基,从而建立尾流激励下的叶片气动力降阶模型并完成气动力数据重构。分别采用周期信号和正弦信号作为输入,采用计算流体力学和气动力降阶模型方法计算叶片气动力,结果显示:采用本征正交分解法降阶模型得到的叶片气动力与计算流体力学计算得到的气动力结果基本一致。证明了基于本征正交分解方法的气动力降阶模型能够快速精确分析尾流激励下的叶片气动力。

The reduced order aerodynamic model of blade was established by POD method,and the aerodynamic characteristics of blade were analyzed quickly.The aerodynamic snapshot matrix was obtained by CFD,then the pod basis of blade aerodynamic force under wake excitation was obtained by using the proper orthogonal decomposition(POD).The reduced order model(ROM)of blade aerodynamic force under wake excitation was established and the aerodynamic data reconstruction was completed.The periodic signal and sinusoidal signal were used as the input respectively,CFD and ROM methods were used to calculate the blade aerodynamic force.The results show that the blade aerodynamic force obtained by pod reduction model was basically consistent with that calculated by CFD.It is proved that the reduced order aerodynamic model based on POD method can quickly and accurately analyze the blade aerodynamic force under wake excitation.