紊流度测点少时最大瞬时畸变值预估

在已有的最大瞬时畸变值的预估方法中,几乎都要求输入各测点脉动压力的均方根值。然而,在工程实际中,特别是选型阶段的小模型。由于实验模型限制了安装动态传感器的数量,或因为动态侧量系统的复杂性及设备费用高等原因,所测得紊流度数据较少。此时,不可能直接用上述文献中介绍的方法来预估最大瞬时畸变值。本文的目的则是要解决紊流度测点较少时最大瞬时畸变值的预估问题。

ESTIMATION OF MAXIMUM INSTANTANEOUS DISTORTION WITH A FEW RMS MEASUREMENTS

A method for estimating the maximum instantaneous distortion with a fewmeasured RMS values of the fluctuation pressures is presented based on reference1]. This method enables to estimate the maximum instantaneous distortion value by assuming that the turbulence distribu tion is uniform and equal to the average value of s few measured RMS values. A comparison between the maximum instantaneous distortion values measured experimentally and estimated by this method shows that the maximum instantaneous distortion can be estimated by the average value of a few men sured RMS values of the fluctuation pressune with the same accuracy as that obtained by the method reference 1].