Experimental investigation of tubing collar's influence on hydrodynamic behavior of annular duct flow  

作　　者：Yi-Su Zhou Zhong-Wei Huang Zhuang-Zhuang Zhang Tian-Wen Jiang Rui-Yue Yang Ming-He Zhang 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum Changping,Beijing 102249,China [2]China University of Petroleum(Beijing),Changping,Beijing 102249,China

出　　处：《Petroleum Science》2022年第5期2326-2342,共17页石油科学（英文版）

基　　金：financial support of the National Key R&D Program of China(No.2019YFB1504102);the National Natural Science Foundation of China(52020105001);the National Science Fund for Distinguished Young Scholars(51725404)and their approval of publishing this paper。

摘　　要：Tubing collars’influence on hydrodynamic behavior of annular duct flow has been investigated using Particle Image Velocity(PIV)technology.PIV has become an efficient method for complex transient flows visualization.A water flow loop with two replaceable variable cross-sections(VCS),75-90 mm and 90-110 mm,in a 129 mm inner diameter(ID)pipe was used.The whole field of the variable cross-section annulus(VCSA)was visualized,including forward-facing step(FFS),narrow annulus(NA),and backwardfacing step(BFS)flow.The VCSA ratio and Reynolds(Re)number influence on streamline distribution,velocity distribution,and turbulence intensity were discussed.Results showed that the recirculation is easier to form in BFS than FFS flow under the same condition.The VCSA ratio affects the formation of recirculation zones and the location of the reattachment point.Reynolds number mainly affects BFS flow by influencing the main velocity component-axial velocity.The turbulence intensity is relatively high in BFS than FFS flow and is larger at y/h>1.0 than y/h<1.0.Furthermore,the streamwise cohere nt structures reveal that the first two modes are predominant and represent the main characteristics of the flow by proper orthogonal decomposition(POD)method.

关 键 词：Variable cross-section annulus flow Sudden contraction and expansion Hydrodynamic behavior PIV POD 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]