最大瞬时畸变图谱的预估

The Estimation of Maximum Instantaneous Distortion Contour Maps

为了分析最大瞬时畸变图谱对发动机工作稳定性的影响,本文提出了一种新的最大瞬时畸变图谱的预估方法。该方法中根据给定的最大瞬时畸变值,利用Fletcher-Reeves非线性优化方法来确定压力分布。与实验测得的最大瞬时畸变图谱的比较表明,本文提出的最大瞬时畸变图谱预估方法能准确地模拟高低压区的位置和大小,高压力梯度区的位置和形状;既使在最大瞬时畸变值误差较大时也能准确地预估最大瞬时畸变图谱。因此,本文提出的最大瞬时畸变图谱预估方法能满足工程精度要求。

A new method for the estimation of maximum instantaneous distortion contour maps is proposed based on the Fletcher-Reeves nonlinear optimum theory. In the method, the maximum instantaneous distortion values are obtained by experiments or predicted by statistical methods; The Fletcher-Reeves nonlinear optimum method is used to determine the pressure distribution that makes the distortion value be equal to the given maximum instantaneous value. A comparison between the estimated and experimental maximum instantaneous distortion contour maps shows that the method described in this paper can accurately predict the range and position of high and low pressure regions, and the position and shape of large gradient of pressure region.