摘要
本文采用ＴＳＩ二维ＬＤＶ系统，对一种双锥双柱形液－ 液旋流分离管内流场进行了全场范围的精细ＬＤＶ诊断，先后考察了处理量、压差比、溢流比和气芯等因素对旋流分离管内流场的影响，结果表明：该旋流分离管中下游区的切向速度呈较为明显的Ｒａｎｋｉｎｅ双涡结构，在上游位涡区中发现有未曾报道过的双峰分布现象；轴向速度由近轴处的上行流、近壁处的下行流以及介于两者之间的零速区组成，其中该零速区随旋流分离管截面的收缩而减小，直到缩小为最后的零速点；旋流分离管中的雷诺应力表现出切向大、轴向小、下游尾管中大和上游锥管中小的分布，表明其中的湍流具有各向异性特性．
The hole flow in the liquid liquid hydrocyclone with double cones & cylinders was carefully diagnosed with a two dimensional LDV system. The influence of flowrate, pressure drop ratio, overflow ratio and gas core on the flow field was investigated successively. The results show that the tangential velocity distribution in the hydrocyclone exhibits a clear Rankine double vortx structure in the lower part of the flow field, but a double peak patten in the upper part of it. These are new flow phenomena that have not been reported in literature. It is also found that the axial velocity profile is composed of the upward flow near the core, the downward flow near the wall and the zero zone between them. The range of the zero zone decreases with the contraction of the pipes cross section till a zero point at the end. Besides, the normal Reynods stress in the tangential direction is greater than that in axial direction, and it has a greater value in cylinder tail than that in the upstream conical pipe. That is to say, the turbulence in this hydrocyclone is anistropic.
出处
《实验力学》
CSCD
北大核心
1999年第4期452-463,共12页
Journal of Experimental Mechanics
关键词
旋流器
液-液分离
流场
LDV诊断
湍流特性
hydrocyclone, oil water separation, LDV diagnosis, velocity distribution, turbulent behavior
