天然气跨音速气水分离过程中收敛-扩张喷管回压段流动分析  

Analysis of Natural Gas Flow in the Back Pressure Segment of the Convergence-Expanding Nozzle

作　　者：王俊奇[1] 白博峰[2] 徐永高[3] 

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [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 [3]中国石油长庆油田分公司油气工艺技术研究院,陕西西安710018

出　　处：《高校化学工程学报》2011年第5期765-768,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：陕西省科学技术研究发展计划项目(2009K10-10);陕西省高校省级重点实验室重点科研项目(2010JS034)

摘　　要：借助收敛-扩张喷管,使天然气流仅通过流道面积的变化即可实现跨音速流动。再绕旋流段内放置的三角翼产生旋流,达到气水分离的目的。整个实现过程中,回压段关系到整个装置压力损失的大小。今利用Fluent 6.1软件对整个流动空间进行模拟计算,再取出回压段进行分析,得到了回压段的压力、流速等参数的变化规律和流场细节。计算结果表明,在回压段,旋流总体呈逐渐衰减的趋势。沿流动方向每个截面上的流动参数分布不均匀。在给定的结构和边界条件下,回压段内的总压损失平均为0.14 MPa。流体进入回压段时的马赫数趋近于1,流出回压段时的马赫数降为0.05左右,降低区域从管壁向管中心逼近,并逐渐扩大。Using convergence-expanding nozzle, the transonic gas flow can be realized by the change of the flow channel area in the nozzle only. In order to achieve the purpose of gas-water separation, swirl flow is generated by making the natural gas flow through around the delta wing swirl segment in the nozzle. Throughout the whole executive process, the back pressure segment relates to the pressure loss of the whole equipment. In this paper, the soft ware Fluent 6.1 was used to simulate and calculate the entire flow field of the nozzle. Then, after carrying out the analysis of back pressure segment, the full and accurate detail of the variations of pressure and velocity in the back pressure segment was obtained. The results show that, in back pressure segment, overall trend of the whirlpool gradually declines. The distribution of flow parameters is uneven on each section of the back pressure segment along the flow direction. Under the given structure and boundary conditions, the average total pressure loss within the back pressure segment is 0.14 MPa. The Mach number tends to be 1 when fluid flows into the back pressure segment and drops to about 0.05 when flows out of it. The decreasing region of the Mach number begins from the wall and approaches to the pipe centre, and gradually expands.

关 键 词：天然气 跨音速 气水分离 回压段 流动 分析 

分 类 号：TE357[石油与天然气工程—油气田开发工程]