S型柔性立管内空气-水两相流流型特征的实验研究  

Experimental Study on Flow Patterns of Air-Water Two-Phase Flow in S-Shaped Flexible Riser

作　　者：李乃良[1] 李文升[1] 郭烈锦[1] 崔嵘 张西迎 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]中海石油(中国)有限公司湛江分公司,广东湛江524000

出　　处：《西安交通大学学报》2011年第7期100-105,共6页Journal of Xi'an Jiaotong University

基　　金：国家科技重大专项资助项目(2008ZX05026-004-002);优秀国家重点实验室专项基金资助项目(50823002)

摘　　要：实验研究了S型柔性立管内空气-水两相流流型特征.实验环路由长114 m的水平环道,16 m的-2°下倾管和高15.3 m、长24 m的S型立管组成,环路内径为50 mm.使用立管底部压力、立管出口持液率HL及其概率密度函数(PDF)分布特征识别和区分流型.实验发现了典型严重段塞流、过渡型严重段塞流、稳定流动3类流型.典型严重段塞流下HL曲线呈方波状,相应的PDF分布呈HL分别为0和1的双峰结构;过渡型严重段塞流下HL曲线呈针刺状,其PDF分布也为双峰结构,但HL的低峰远高于HL的高峰;稳定流动下的PDF分布呈HL为0.27左右的单峰状.分析表明,典型和过渡型严重段塞流分别与垂直上升管弹状流和块状流具有相似的PDF分布特征,但彼此的流动形态却完全不同.Air-water two-phase flow patterns in an S-shaped flexible riser were experimentally studied.The test loop consisted of a horizontal pipeline 114 m in length and 50 mm in i.d.,a-2° downward inclined pipe 16 m in length,and an S-shaped riser 15.3 m in vertical height and 24 m in length.The pressure at the bottom of the riser,the riser outlet liquid holdup HL and the probability density function（PDF） distribution were adopted in the identification of the flow patterns.The experimental results show that there were three types of flow patterns in the flexible riser,i.e.,typical severe slugging,transitional severe slugging,and stable flow.For the typical severe slugging,the square shape profile of HL exhibited a PDF distribution with two peaks at HL=0 and HL=1,respectively;the acicular shape profile of HL for transitional severe slugging also had a bimodal PDF distribution,but the peak at high HL was much lower than that at low HL;the PDF of HL for stable flow displayed a unimodal distribution with a single peak at HL=～0.27.In addition,the analysis shows that the PDF distributions for typical severe slugging and transitional severe slugging are similar to those for slug flow and churn flow in an upward vertical pipe,respectively,but the flow behavior is totally different from each other.

关 键 词：S型柔性立管 严重段塞流 流型 PDF分布 

分 类 号：O359[理学—流体力学]