基于Gappy POD的S形扩压器稳态出口流场预测方法研究

Prediction Method Research of Steady Flow Flied for S-shaped Diffuser Based on Gappy POD

针对实现主动流动控制需要对流场快速获知,提出通过扩压器壁面静压测量值预测出口流场的设想。利用已有的Gappy POD方法实现预测,但该方法在高模态条件下计算精度差。为解决此问题,在已有方法基础上对计算过程中每一步迭代误差进行不同处理,得到Method_1和Method_2。计算结果表明,在静压测点数足够条件下,两种方法能够实现更高精度的计算;并且在不同程度上解决了已有方法在高模态下计算精度差的问题。另外,当测点数达到40时,Method_2计算精度更高。

The idea of using several points of static pressure along the wall to predict the flow flied in the outlet of the S shaped diffuser based on POD is proposed to achieve real time or rapid acquisition of the flow flied. The traditional POD based method is put into use but high accuracy can＇ t be achieved in high mode number condition. Two different dispose method of iterative err is proposed here to solve that problem. The results show that they can achieve more accurate calculation and lower global err in high mode number if the static pressure measure point is sufficient. additionally,the second method can achieve higher accuracy when the number of measure point reach 40.