有机工质向心透平导向叶栅内流分析  

INFLOW ANALYSIS OF STATOR IN RADIAL-INFLOW TURBINE USING ORGANIC WORKING FLUIDS

作　　者：韩中合[1] 贾晓强 李鹏[1] Han Zhonghe;Jia Xiaoqiang;Li Peng(Key Lab of Condition Monitoring and Control for Power Plant Equipment,Ministry of Education,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,保定071003

出　　处：《太阳能学报》2020年第7期313-320,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51306059);国家科技支撑计划(2014BAA06B01);中央高校基本科研业务费专项资金(2017XS120)。

摘　　要：有机工质向心透平作为有机朗肯循环(ORC)发电系统的核心设备,对系统优化设计有重要影响。通过对工质物性的分析,分别在低温和中高温领域选择R245fa和甲苯为工质,针对这2种工质设计不同结构的导向叶栅二维模型。选用剪切应力输运(SST)k-ω模型进行数值模拟,工质物性参数用PR方程计算,对计算结果进行对比分析表明:安装角为32°,叶片数量为22时工质为R245fa的导向叶栅流动损失最小,参数分布最优;安装角为28°,叶片数量为36时工质为甲苯的导向叶栅流动损失最小,参数分布最优。最后研究了工质物性参数(比热与粘性)对导向叶栅流动的影响,证明比热对流动的影响较大。As the core equipment of organic Rankine cycle(ORC)power generation system,the radial-inflow turbine using organic working fluids has a very enormous influence on optimizational design of the system.Through the analysis of physical properties,R245fa and toluene were selected as working fluids in the low temperature and medium and high temperature fields respectively,and the two-dimensional model of stator was designed in different structures.Using shear stress transport(SST)k-ωmodel,numerical simulation was carried out,in which the physical property parameters of working fluids were calculated by PR equation.The comparative analysis of the simulation results shows that,when the installation angle is 32°,the blade number is 22,the stator using R245fa as working fluid has the smallest flow loss and the best parameters distribution;when the installation angle is 28°,the blade number is 36,the stator using toluene as working fluid has the least flow loss and the best parameters distribution.Finally,the influence of the physical parameters(specific heat and viscosity)on the flow of the stator was studied,and the result shows that specific heat has a greater influence on the flow of working fluids.

关 键 词：有机物 透平 喷嘴 化学性质 有机朗肯循环 导向叶栅 

分 类 号：TK123[动力工程及工程热物理—工程热物理]