近临界CO_(2)透平膨胀机设计与内流平衡相变研究  

Design and Study on Near-critical CO_(2) Turboexpander and Internal Flow Equilibrium Phase Change

作　　者：姜华[1] 魏丽红 郭芮伶 宫武旗[3] JIANG Hua;WEI Li-hong;GUO Rui-ling;GONG Wu-qi(School of Energy,Xi'an University of Science and Technology,Xi'an,China,710054;China Northwest Architecture Design and Research Institute Co.Ltd,Xi'an,China,710018;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an,China,710049)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]中国建筑西北设计研究院有限公司,陕西西安710018 [3]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《热能动力工程》2021年第11期20-25,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家科技重大专项(2017-V-0012-0064)。

摘　　要：基于均相理论及流体动力守恒原理,对进口处于近临界区、出口为两相状态及质量流量为5.5 kg/s的透平膨胀机进行设计,得到膨胀机蜗壳、喷嘴和工作轮的基本几何参数,再采用平衡相变模型对膨胀机内流相变特性进行数值分析。结果显示:喷嘴入口处开始产生气体,叶轮出口气体质量分数为27%,等熵效率为65%,与设计值相差9.72%。结果表明,此设计方法可以用来设计两相状态CO_(2)透平膨胀机,平衡相变模型适用于CO_(2)透平膨胀机的内流相变特性研究。The turboexpander with the inlet in near-critical region,outlet in two-phase state and mass flow rate of 5.5 kg/s was designed and the basic geometric parameters of expander volute,nozzle and rotor were obtained based on homogeneous phase theory and hydrodynamic conservation principle.The characteristics of internal flow phase change in the expander was numerically analyzed with equilibrium phase change model.The results show that gas appears at the nozzle inlet,the mass fraction of gas is 27%at the impeller outlet,and the isentropic efficiency is 65%,which is 9.72%lower than design value.This design method can be used to design the two-phase CO_(2)turboexpander,and the equilibrium phase change model is suitable for studying the internal flow phase change characteristics of CO_(2)turboexpander.

关 键 词：透平膨胀机 CO_(2) 膨胀机设计 平衡相变 

分 类 号：TB653[一般工业技术—制冷工程]