气液两相多级液力透平的全流道数值模拟  

Numerical Simulation of Whole Flow Passage for a Multi-stage Hydraulic Turbine with Gas-liquid Two-Phase Media

作　　者：杨军虎[1] 许亭[1] 刘浩然[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《西华大学学报（自然科学版）》2014年第5期103-108,共6页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(51169010);十二.五国家科技支撑计划(2012BAA078B045)资助项目

摘　　要：以DG85-80五级节段式离心泵做液力透平,基于CFD软件,采用N-S方程和标准κ-ε湍流模型,选择Mixture多相流模型,利用SIMPLE算法,对其在纯水介质和气液两相介质时进行全流道数值模拟,得到透平的外特性曲线和内流场规律。结果显示:气液两相透平在最优工况点的压头、功率比纯水透平的高,而水力效率和质量流量较纯水透平的低;在最优工况点,随着级数增加,气液两相透平各级导叶、叶轮进出口压差增大,其内部压力分布的不均匀性增加,叶片工作面进口附近的漩涡区域减小;与小流量时的透平相比,大流量时透平各级叶轮、导叶内部的气体体积分数较大,透平叶轮出口附近的高含气率区域较小,各流道中气体分布的不对称性加剧。A DG85-80 five segmental centrifugal pump was chosen to work as a turbine and in order to obtain the external charac -teristics and the internal flow of the PAT ,the numerical simulation of full passage in the case of PAT work with water phase and gas -liq-uid two-phase was conducted based on CFD software .N-S equations, the standard two equations κ-ε turbulent model,mixture model and SIMPLE algorithm were used for the simulation .The results indicated that at the optimum operating point , the head and power of gas-liquid two-phase turbine were higher than that of pure water turbine but the hydraulic efficiency and mass flow was lower .At the optimal operating point , with the series increase , the pressure difference of every impeller and guide vanes of turbine with gas-liquid two-phase media and the heterogeneity of its internal pressure distribution increased , while vortex region near the inlet pressure face of vanes was reduced .Compared with the turbine of the small flow , the GVF of every impeller and guide vanes of turbine with large flow was greater , the area of high GVF near the outlet of impeller was small and the asymmetry of gas distribution in each runner became ex -acerbated .

关 键 词：多级离心泵 气液两相 液力透平 数值模拟 流场分析 

分 类 号：TK8[动力工程及工程热物理—流体机械及工程]