摘要
通过水洞试验对尾部轴向喷气的振荡与水流的相互作用现象进行研究,采用高速摄像记录水下尾部喷流发展过程,利用内测系统测量射流尾部压力脉动及航行体流体动力特征。试验捕捉到了静水时气体射流产生200~250Hz范围内的强烈脉动,同时发现当水洞中有流动时喷气所产生的高频与低频脉动都十分微弱,分析其原因为外部流动会消除喷流的振荡,喷流又会抑制外部来流带来的尾部脱落涡的脉动。在外部来流状态下,通过尾部喷流方式可以明显降低尾部阻力,推断了尾部喷流的减阻机理。
The interaction between the oscillation of the tail axial jet and the flow is studied by water tunnel test.The development process of underwater tail jet was recorded by high-speed camera.Pressure fluctuation at jet tail and hydrodynamic characteristics of vehicle by internal measurement system was measured.The strong pulsation in the range of 200~250 Hz was captured in the static water.At the same time,it was found that the high-frequency and low-frequency pulsations generated by the jet when the external flow is very weak.The reason for the analysis is that the external flow will eliminate the oscillation of the jet flow,and the jet flow will also suppress pulsation of the tail shedding vortex caused by the external flow.In the external flow state,the tail drag can be significantly reduced by the tail jet mode,and the mechanism of the tail jet drag reduction is deduced.
作者
赵静
徐志程
陆宏志
魏洪亮
詹景坤
李明
ZHAO Jing;XU Zhi-cheng;LU Hong-zhi;WEI Hong-liang;ZHAN Jing-kun;LI Ming(China Academy of Launch Vehicle Technology,Beijing 100076,China)
出处
《强度与环境》
CSCD
2020年第5期60-64,共5页
Structure & Environment Engineering
基金
基础科研项目。
关键词
水下喷流
压力脉动
减阻
尾部脱落涡
Underwater jet
pressure fluctuation
drag reduction
tail shedding vortex
