摘要
与喷到水中的水喷流(潜喷流 submerged jet)不同,喷到大气中水的喷流(自由喷流 free jet)从喷嘴喷出后会发生缩流,然后再渐渐扩散,但这种缩流的流动机理迄今都没有被非常清楚的描述。本文对喷管喷出的射流进行了详细的非定常粘性流动解析,究明了产生缩流时准自由射流区域内压能转化为动能的机理,并用数值计算方法对自由射流的缩流直径进行了预测。
Different from the submerged jet, the water jet emerged out of the nozzle contract firstly,
then (the jet's section) enlarged gradually. Hitherto, the flow mechanism between the nozzle throat
and the contraction section is not clarity. The paper presents a lump sum numerical analysis of the
unsteady viscosity water jet flow, to clarify the flow niechanism of pressure energy transferred into
kinetic energy in the needle wake of semi-free jet. Moreover, the velocity and diameter of contraction
section will also be predicted through numerical analysis.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第3期421-423,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50379015)
关键词
自由射流
缩流机理
多相流
数值解析CFD
能量损失
free jet
multi-phase flow
numerical analysis CFD
jet contraction mechanism
energy loss
