瞬时畸变极值预测的随机涡方法

一、改进随机涡预测模型的建立及应用　　对于湍流型进气畸变压力场 ,文献 1]提出了一种随机涡模拟方法。将非定常 N- S方程与统计学理论相结合 ,将随机涡尺寸与畸变指数峰值相关联。对此 ,作者在文献 2 ]中作了详细的推导、分析和预测 ,发现在原模型的应用中 ,存在着两个明显困难 :合理确定瞬时畸变分布 ;迅速和准确确定涡核半径 a。实验和模拟结果表明畸变分布介于正态分布与 Weibull分布之间变化。因此 ,对不同的畸变指数和瞬时均需判定和参数估计 ,不仅费时且精度也不图 1　试验装置前段及测点布置高。本文采用的方法为 :在预测周…

A RANDOM VORTEX METHOD FOR PREDICTION OF MAXIMUN INSTANTANEOUS INLET TOTAL PRESSURE DISTORTION

An improved random vortex model for predicting maximum instantaneous pressure distortion is presented based on the statistical behavior of turbulence type dynamic inlet total field generated by plate type turbulence generator.A new statistical method is put forward for determining the vortex core size.The numerical results show good accuracy of the prediction.This method also decreases the dynamic inlet pressure measurements.The effectiveness of the method in decreasing both cost and time is proved well.