竖直上升圆管内气液两相流流型特性的数值模拟  

Numerical simulation of flow pattern characteristics of gas-liquid two-phase flow in vertical rising pipes

作　　者：俞强强 施红辉[1] 董若凌[1] 彭双双 YU Qiangqiang;SHI Honghui;DONG Ruoling;PENG Shuangshuang(Faculty of Mechanical Engineering&Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2022年第3期397-404,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(11772309);浙江省基础公益研究计划项目(LGGI9A020002)。

摘　　要：为了研究竖直上升圆管内气液两相流的流型特性,利用Fluent软件对气相表观速度为0.480~10.105 m/s、液相表观速度为0.089~1.065 m/s和管道直径为20.0 mm的竖直圆管气液两相流进行数值模拟。将数值模拟结果与相对应的实验结果进行对比,结果表明:内径为20.0 mm的竖直上升圆管内出现的主要流型为泡状流、弹状流、搅混流和环状流,与实验结果相同;通过将20.0 mm管径圆管数值模拟数据点代表的各流型区域与Hewitt和Roberts绘制的31.2 mm管径圆管各流型区域进行对比,发现流型区域大部分重合,小部分流型边界存在差别;20.0 mm管径竖直圆管相较于31.2 mm管径竖直圆管,其泡状流与弹状流流型边界所需的液相表观速度减小,并且液相表观速度较低时,弹状流与搅混流流型边界所需的气相表观速度增大;截面含气率在流型为泡状流时保持稳定,截面在弹状流、搅混流和环状流时,管道中心截面含气率较高,管道中心向两侧壁面移动,含气率数值呈递减的趋势。通过结合VOSET方法和PISO求解算法可准确模拟管道内气液两相流,为探索竖直上升圆管气液两相流流型特性提供了研究思路。In order to study the flow pattern characteristics of gas-liquid two-phase flow in a vertical rising pipe, the Fluent software was used to simulate the gas-liquid two-phase flow in a vertical pipe with gas phase apparent velocity of 0.480-10.105 m/s, liquid phase apparent velocity of 0.089-1.065 m/s and pipe diameter of 20.0 mm. Through the comparison between the numerical simulation results with the corresponding experimental results, it was found that the main flow patterns in the vertical rising tube with inner diameter of 20.0 mm were bubble flow, slug flow, agitated flow and annular flow, which were consistent with the experimental results. By comparing the flow pattern regions represented by the numerical simulation data points of 20.0 mm diameter pipe with the flow pattern regions of 31.2 mm pipe drawn by Hewitt and Roberts, it was found that most of the flow pattern regions coincided and the boundaries of a small number of distributary patterns were different. For the vertical circular pipe with 31.2 mm diameter, compared with the vertical circular pipe with 20.0 mm diameter, the liquid phase apparent velocity required by the bubble flow and slug flow boundary decreased, and when the liquid phase apparent velocity was relatively low, the gas phase apparent velocity required by the slug flow and agitated flow pattern boundary increased. The void fraction of the cross section remained stable when the flow pattern was bubble flow, and when the cross section was slug flow, agitated flow and annular flow, the void fraction of the central section of the pipe was relatively high, the center of the pipe shifted to the walls on both sides, and the void fraction value showed a decreasing trend. In this paper, the gas-liquid two-phase flow in the pipe can be accurately simulated by combining the VOSET method and the PISO algorithm, thus providing a research idea for exploring the flow pattern characteristics of gas-liquid two-phase flow in a vertical rising pipe.

关 键 词：竖直上升圆管 气液两相流 数值模拟 流型 管径 截面含气率 

分 类 号：O359.1[理学—流体力学]