气泡直径对气液混输泵流动特性影响的数值研究  

Numerical Study of Influence of Bubble Diameter on Flow Characteristics of Multiphase Pump Handling Gas-Liquid Flow

作　　者：李智豪 张文武 祝宝山[3,4] 赵浩儒 李正贵 Li Zhihao;Zhang Wenwu;Zhu Baoshan;Zhao Haoru;Li Zhenggui(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China;College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,China)

机构地区：[1]西华大学能源与动力工程学院,成都610039 [2]中国农业大学水利与土木工程学院,北京100083 [3]清华大学能源与动力工程系,北京100084 [4]清华大学山西清洁能源研究院,太原030032

出　　处：《水动力学研究与进展（A辑）》2023年第6期836-841,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(52109107,52279092);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2022-E-03)。

摘　　要：混输泵内气-液流动非常复杂,气泡可能会聚合或破裂,导致气泡尺寸不尽相同,然而气泡直径对混输泵内气液流动特性的影响尚不明确。为研究气泡直径对叶片式混输泵气-液流动特性的影响,该文采用ANSYS CFX对不同进口气泡直径下叶片式混输泵内气-液流动进行了全流道定常模拟。数值计算结果表明:进口含气率IGVF=10%时,混输泵的扬程和效率随着进口气泡直径的增加而下降,且其下降趋势可分为三个阶段。同时,随着进口气泡直径增大,叶轮内气体聚集程度增强,湍动能增大,叶轮内流场更为紊乱。与进口气泡直径d≤0.3 mm相比,当d≥0.4 mm时,液体对气泡的夹带能力较弱,叶轮内气体的聚集程度明显增强,导叶内流动出现了明显的多涡结构,气-液流动性较差,导致混输泵的效率和扬程显著下降。The gas-liquid flow in a multiphase pump is very complex,and bubbles may aggregate and rupture,resulting in varying bubble sizes.However,the influence of bubble diameter on the gas-liquid flow characteristics in a multiphase pump is not yet clear.To study the above-mentioned influence,steady simulations of gas-liquid flow are conducted using ANSYS CFX under different inlet bubble diameter conditions in this paper.The numerical results show that when the inlet gas void fraction is 10%,the head and efficiency of the pump decrease with the increase of inlet bubble diameter,and the downtrend can be divided into three stages.Meanwhile,when the inlet bubbles diameter increases,the degree of gas accumulation inside the impeller and the turbulent kinetic energy increases,and the flow in the impeller becomes more disordered.Compared with the results when the diameter of inlet bubbles d≤0.3 mm,when d≥0.4 mm,the liquid has a weaker ability to entrain bubbles,the degree of gas accumulation inside the impeller is enhanced significantly,and there is obvious multi-vortex structures and poor gas-liquid fluidity in the guide vane,resulting in a significant decrease in the efficiency and head of the multiphase pump.

关 键 词：混输泵 气泡直径 气液两相流 含气率 数值模拟 

分 类 号：TH312[机械工程—机械制造及自动化]