射流噪声场特性的试验研究

对不同喷口直径的单股亚音速射流及非设计状态超音速射流噪声场进行了试验研究,获得了射流噪声的总声压场分布特性.结合射流流场结构,速度场和湍流场实验研究结果,讨论了噪声源和声场分布特性,以及喷口直径、唇部厚度、压缩性和封闭空间对噪声场特性的影响.

矩形喷流的相似性及流场积分计算方法研究

The similarity laws of a rectangular jet are summarized on the basis of the experimental data in literature.An integration method is also presented for calculating a constant-pressure,compressible rectangular jet to examine the stealth performance of the rectangular jet.The integration method gives a good prediction of the constant-pressure rectangular jet,and the calculated results agree well with the experimental data.A brief analysis of the stealth performance of the rectangular jet is described in the paper as well.

突扩管中受限射流的计算方法研究

突扩型燃烧室的结构简单可靠,近年来已引起广泛注意。为了计算时均流场和湍动流场,必须考虑迴流区及附面层全方位的压力梯度,给计算方法带来困难。 本文由时均的N—S方程和—ε湍流模型出发,将Patankar解耦技术推广到可压缩流,采用牛顿迭代法和稀疏矩阵技术,由连续和动量方程直接求解压力和速度场。