Oscillation modes of supersonic multijets exhausting from very adjacent multiple nozzles.
Oscillation modes of supersonic multijets exhausting from very adjacent multiple nozzles.
复制标题
从非常相邻的多个喷嘴排气的超音速多喷嘴的振荡模式。
DOI：
10.1121/1.1404380
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
R. Ishii
中科院分区：
文献类型：
--
作者：
Y. Umeda;R. Ishii
实验研究了中心间距为1.4倍喷嘴直径的方形双射流和多射流的振荡模式。结果表明，在压比约为4.1时，双射流同时以三种不同的振荡模式振荡。从声学观察，这些振荡模式被确定为一个横向振荡模式垂直于一个平面组成的双射流轴和两个横向振荡模式平行于这个平面。对于一个正方形布局的多射流，只有一个横向振荡模式被观察到。在这种情况下，可以观察到，当由四个射流形成的正方形的两个面对的边之间的间距被拉伸时，其他两个边之间的间距收缩，反之亦然。
The oscillation modes of a supersonic circular twin jet and multijet with square configuration where the center-to-center spacing of nozzles was fixed to 1.4 times the nozzle diameter were investigated experimentally. It is found that the twin jet oscillates simultaneously in three different oscillation modes for the pressure ratios of about 4.1. From the acoustical observation, these oscillation modes are identified as one lateral oscillation mode perpendicular to a plane composed of the twin jet axes and two lateral oscillation modes parallel to this plane. For a multijet with a square configuration, only one lateral oscillation mode was observed. In this case, it is observed that when the spacing between two facing sides of the square formed by four jets is stretched, the spacing between the other two sides shrinks and vice versa.