V锥节流装置内气液分层流动特性数值模拟  

Numerical simulation of stratified gas-liquid flow inside V-cone throttle device

作　　者：贺登辉 陈森林[1] 白博峰[2] HE Denghui;CHEN Senlin;BAI Bofeng(State Key Laboratory of Eco-hydraulic in Northwest Arid Region,Xi an University of Technology,Xi an 710048,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi an Jiaotong University,Xi an 710049,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《中国石油大学学报（自然科学版）》2019年第3期151-158,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51709227);陕西省自然科学基础研究计划项目(2019JQ-116)

摘　　要：针对气液分层流流量在线测量问题,对V锥节流装置内的气液分层流流动特性及其对测量的影响进行数值模拟。研究锥尾尾涡的形成、变化及对流动的影响,结合气液两相流流经V锥的相分布特性,揭示流动特性对差压测量的影响规律。结果表明:V锥锥尾下游形成大尺度的尾流漩涡;分层流来流条件下,尾涡呈现上部大下部小的不对称分布形态,随着表观液速增大,尾涡下游端点向管道下部倾斜越明显;锥尾取压口附近的流动较为稳定,且锥尾取压孔附近液相含量极低,使得低压取压环境较为稳定,进而有利于差压测量。To online measure the flow rate of the stratified gas-liquid flow,the characteristics of gas-liquid stratified flow in the V-cone throttle device were numerically simulated.The effects of flow on the measurement of differential pressure were also analyzed.The formation,evolution of the vortex behind the V-cone and its influence on the flow were investigated.In combination with the gas and liquid distribution upstream and downstream of the V-cone,the effects of the gas-liquid stratified flow on the measurement of pressure difference were discussed.The results show that a large scale vortex was formed behind the V-cone.Moreover,the vortex was asymmetry in the upper and lower part of the pipe,in which the vortex length in the upper part of the pipe is bigger than that in the lower part.The end of the vortex tends to incline to the lower part of the pipe with the increase of the superficial liquid velocity.The gas and liquid distribution downstream of the V-cone demonstrates that little liquid is entrained into the vortex and no liquid appeared around the low pressure tapping,which makes a more stable differential pressure feasible and is beneficial to the measurement of the differential pressure.

关 键 词：气液分层流 V锥流量计 尾涡 数值模拟 VOF模型 

分 类 号：TK313[动力工程及工程热物理—热能工程] TH71[机械工程—测试计量技术及仪器]