摘要
用湍流κ－ε方程模型对风琴管式喷嘴外流场进行数值模拟，得出轴向速度、径向速度的分布规律和衰减规律，为提高清除岩屑效率提供依据．计算结果表明，在喷嘴出口处存在抽吸现象，射流剪切层的边界处具有大尺度的涡流结构．射流剪切层的边界形状为波状，流场中轴心速度和沿径向的轴向速度衰减规律不随雷诺数的变化而变化．随着喷距的增加，沿径向的轴向速度衰减变慢，随着喷嘴出口到井底间距离的增大，射流轴心速度衰减变慢，但其变化幅度不大．
The numerical simulation of the axisymmetric jet emanating from the flowfield of organ-pipe nozzle is made with the turbulence k-ε equations model. The flowfield vectors show that there exists absorb phenomenon near the nozzle exit. and there is a large scale of vortex structure near the shear layer with wavy boundary shape. The computation shows that the nondimensional axial velocity for an organ-pipe nozzle with a given configuration size attenuates slowly with the increase of stand-distance. and the attenuation pattern remains the same. The nondimensional axial velocity along the jet centerline attenuates sloxly with the increase of distance between the nozzle exit and the impinging plate.
出处
《石油大学学报（自然科学版）》
CSCD
1996年第2期36-39,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家教委博士点基金
关键词
射流
流场
紊流
风琴管喷嘴
喷嘴
钻井
Jets
Flowfield
Turbulent flow
Numerical simulation
Organ-pipe nozzle
