有机工质向心透平数值模拟及变工况内流特性研究  

Numerical Simulation of Organic Working Medium Radial Inflow Turbine and Study on Internal Flow Characteristics Under Off-design Conditions

作　　者：韩旭[1] 李奇[1] 杨依栋 李鹏[1] 刘树华[1] 韩中合[1] HAN Xu;LI Qi;YANG Yidong;LI Peng;LIU Shuhua;HAN Zhonghe(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学河北省低碳高效发电技术重点实验室,河北保定071003

出　　处：《动力工程学报》2024年第2期260-269,共10页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52106010);中央高校基本科研业务费专项资金资助项目(2022MS084)。

摘　　要：基于国内外研究现状,分别对设计工况下和非设计工况下有机朗肯循环向心透平的工作状态进行了三维数值模拟。以透平功率、效率、反动度、静叶损失系数、动叶损失系数作为评价指标,分析了透平在非设计工况下的性能;同时开展了透平在非设计工况下流动状况的描述。结果表明:设计工况下透平输出功率为122.3 kW,透平等熵效率为83.54%;在非设计工况下,透平功率和效率在转速比为0.8~1.0时的增幅较大,透平反动度和静叶损失系数均与转速呈线性关系,而动叶损失系数在转速比为0.8~1.2时存在最小值;当转速低于设计转速时,在动叶前缘吸力面存在涡流,当转速高于设计转速时,涡流存在于动叶压力面的前缘,造成此现象的主要原因是动叶转速与静叶出口流速的周向分量之间存在差值。Based on the research status at home and abroad,3D numerical simulations were carried out for an organic Rankine cycle turbine under design and off-design conditions respectively.Taking turbine power,efficiency,reaction,stator blade loss coefficient,and rotor blade loss coefficient as evaluation indexes,the performance of the turbine under off-design conditions was analyzed.At the same time,the flow condition of the turbine under off-design conditions was described.Results show that the turbine output power is 122.3 kW and the turbine isentropic efficiency is 83.54%under design condition.While under off-design conditions,the turbine power and efficiency increase greatly when the speed ratio is 0.8-1.0.The reaction coefficient and stator blade loss coefficient of the turbine are linear with the speed,while the rotor blade loss coefficient has a minimum value when the speed ratio is 0.8-1.2.When the rotating speed is lower than the design value,vortices exist on the suction surface of the leading edge of the rotor blade;when the rotating speed is greater than the design speed,vortices exist on the leading edge of the pressure surface of the rotor blade.The main reason for this phenomenon is that there is a difference between the rotating speed of the rotor blade and the circumferential component of the stator blade outlet velocity.

关 键 词：有机朗肯循环 向心透平 非设计工况 流动状况 数值模拟 

分 类 号：TK14[动力工程及工程热物理—热能工程]