进气道出口最大瞬时畸变值的预估

THE ESTIMATION OF THE MAXIMUM INSTANTANEOUS DISTORTION AT THE OUTLET OF INLET

一、前言 进气道和发动机匹配研究中,通常要在进气道的选型阶段,对其出口动态畸变的最大瞬时值进行预估,以了解其是否超过了发动机的容限,以便采取措施调整设计,把进/发匹配问题解决于较早阶段。预估问题在美国已有三种方法。这三种方法各有优缺点,其中数Motycka方法优点较多,因而应用前景亦较广。

In this paper, a new statistical method of estimating the maximum instantaneous inlet pres-sure distortion is described. By this method, the time average and RMS values of the instantaneous pressure distortion index can be obtained theoretically from the measured inlet total steady-stale pressure and RMS values. The most probable maximum instantaneous distortion index which occurs in a given duration can also be obtained. Comparison between the estimated values and the experimental results shows that the described method can accurately estimate the maximum instantaneous distortion index within 3 sec. on an Intel 86/330 microcomputer.