摘要
对常压下脉冲喷嘴自由淹没射流结构特性进行了试验研究.并对设计出的脉冲喷嘴进行了大量试验.结果表明,脉冲喷嘴射流的外边界变化规律、等速核和无因次速度分布规律等均与普通射流有较大差异.脉冲喷嘴射流的外边界为一波浪线,且在喷距达一定数值后,随着喷距的加大,呈非线性缓扩直至平直趋势.脉冲喷嘴射流不存在明显的等速核,射流从喷嘴一射出就有较大的速度脉动.文章给出了脉冲喷嘴射流轴心线上的脉动速度与无因次喷距之间的变化规律.
This paper studies experimentally the structure and characteristics of free submerged self-resonating nozzle jet under atmospheric pressure. A self-resonating pulsating nozzle is designed and tested systematically. The results show that the external boundary, potential core and dimensionless velocity distribution curve are different from those of general jets. The external boundary of this self-resonating pulsating nozzle jet is a wavy curve which assumes a tendency from nonlinear gradual expansion to smoothing out with the increase of stand-off distance. The self-resonating pulsating nozzle jet has no clear potential core. But it has a large pulsating velocity. In this paper, the relation of pulsating velocity pulsating velocity versus dimensionless stand-off distance on the jet axis is given.
出处
《石油大学学报（自然科学版）》
CSCD
1992年第4期32-35,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
脉冲
喷嘴
射流
脉动
Pulse
Nozzle
Jets
Characteristics
Pulsed flow
Flow velocity
