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为了提高基本Gappy本征正交分解(POD)翼型反设计方法的精度,在原始方法快照采样过程中,调整参数化方法,并用已产生翼型中压力分布最接近目标压力分布的翼型替换基础扰动翼型,形成最优快照替换采样法。在迭代求解阶段,根据迭代产生的压力分布与迭代产生的翼型实际压力分布之间的误差,引入校正快照,并据此调整目标压力分布,形成校正迭代法。实际算例表明,最优快照替换采样法所采集快照张成的空间较原始采样法更接近设计目标。而校正迭代法较原始迭代法能明显提高反设计精度。但最佳模态数量的选择对于Gappy POD翼型反设计方法仍然是一个难点。
In order to improve the precision of the basic Gappy EOM orthogonal inverse (POD) airfoil inverse design method, during the sampling of the original method snapshot, the parameterization method is adjusted and replaced with the airfoil that has the closest pressure distribution in the airfoil to the target pressure distribution Basic disturbance airfoil to form the optimal snapshot replacement sampling method. In the iterative solving stage, the correction snapshot is introduced according to the error between the pressure distribution generated by the iteration and the actual pressure distribution of the airfoil generated by the iteration, and the target pressure distribution is adjusted accordingly to form the calibration iteration method. The practical examples show that the optimal snapshot replacement sampling method to capture the snapshot into the space than the original sampling method closer to the design goal. The calibration iteration method can significantly improve the anti-design accuracy compared with the original iteration method. However, the choice of the optimal modal number is still a challenge for the Gappy POD airfoil inverse design method.