不同入流气泡直径下圆盘泵气液两相流模拟  

Simulation of Gas-Liquid Two-phase Flow in Disc Pump under Different Inflow Bubble Diameters

作　　者：夏毅帆 崔清清 邱壤稼 江启峰 张惟斌[1,2] 衡亚光 熊平 Xia Yifan;Cui Qingqing;Qiu Rangjia;Jiang Qifeng;Zhang Weibin;Heng Yaguang;Xiong Ping(Key Laboratory of Fluid and Power Machinery of Ministry of Education,Xihua University,Chengdu 610039;School of Energy and Power Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学流体及动力机械教育部重点实验室,成都610039 [2]西华大学能源与动力工程学院,成都610039

出　　处：《水动力学研究与进展（A辑）》2024年第3期320-329,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(52079118);四川省科技厅资助项目(2020YFH152);四川省科技计划资助项目(2022YFH0017)。

摘　　要：为研究气液两相流圆盘泵内部流型转换及气泡直径的变化规律,该文采用可视化研究并结合数值模拟进行分析。结果表明:当进口含气率从1.12%增至27.67%时,吸水室内流型由均匀泡状流向聚集泡状流、弹状流和分层流依次过渡。低含气率下的气泡直径较小,吸水室内气液混合均匀且流动顺畅;随着含气率的升高,气泡直径逐渐增大,且吸水室内气液两相间分离程度增大。由于圆盘泵叶轮结构的特殊性,前后盖板有叶区内叶片起到阻隔作用,在有叶区叶片边缘处,气相聚集最为剧烈,而中间无叶区流道较为宽阔,具有较高的通透性。在转速1500 r/min,入口体积含气率7.11%工况下,前盖板有叶区叶片前边缘的局部含气率极值增至初始含气率的3倍,后盖板有叶区叶片边缘的局部含气率极值增至初始含气率的2倍,无叶区中间截面含气率极值跌至初始含气率的2/3。该研究可为分析圆盘泵叶轮内气相分布及运移规律提供参考。In order to study the internal flow pattern transformation and the change law of bubble diameter in the gas-liquid twophase flow disc pump,the visualization research and numerical simulation are used for analysis in this paper.The results show that when the inlet gas volume fraction increases from 1.12%to 27.67%,the flow pattern in the suction chamber changes from bubble flow to agglomerated bubble flow,slug flow and segregated flow.The bubble diameter at low gas content is small,and the gas-liquid mixing in the suction chamber is uniform and the flow is smooth.With the increase of gas content,the bubble diameter increases gradually,and the separation degree of gas-liquid two-phase in the suction chamber increases.Due to the particularity of the impeller structure of the disc pump,the blades in the leaf area of the front and rear cover plates play a barrier role.The gas phase gathers most violently at the edge of the blade in the leaf area,while the flow channel in the middle leafless area is wider and has higher permeability.Under the condition of 1500 r/min and inlet gas volume fraction 7.11%,the local void fraction extreme value of the front edge of the blade in the blade area of the front cover plate increases to 3 times of the initial void fraction,the local void fraction extreme value of the blade edge in the blade area of the rear cover plate increases to 2 times of the initial void fraction,and the void fraction extreme value of the middle section of the bladeless area decreases to 2/3 of the initial void fraction.This study can provide a reference for analyzing the gas phase distribution and migration law in the disc pump impeller.

关 键 词：气液两相流 圆盘泵 进口气泡直径 高速摄像 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]