摘要
本文以国内首套MW级压缩空气储能(CAES)系统末级向心涡轮为研究对象,通过数值模拟分析了变工况条件下轮背空腔-密封气对等熵效率和流场结构的影响.结果表明:在求解中考虑轮背空腔-密封气结构能够使等熵效率数值解的偏差减小0.7%;随涡轮进口压力增加,轮背空腔泄漏流由叶片吸力面中部叶高区域逐渐向轮毂转移,流动损失先增加后减小;合理降低轮背空腔泄漏气体的轴向速度,能够减弱轮背空腔-密封气结构对等熵效率的负面影响,使向心涡轮在较宽的变工况范围内都保持高效运行.
In present study,the last stage of a multistage radial inflow turbine in a MW-scale compressed air energy storage(CAES) system is selected as a research object.The influence of back cavity-seal gas on the isentropic efficiency and flow structure of the radial inflow turbine under variable operating conditions is investigated.The results illustrate that the deviation of isentropic efficiency can be decreased by 0.7% if the back cavity and seal gas are included in the model.With the increase of inlet total pressure,the back cavity leakage flow gradually migrated from the region near middle height of blade at suction surface to the hub of rotor.The flow loss is thus increased firstly and then decreased.With the increase of inlet total temperature,the influence degree of back cavity and seal gas on isentropic efficiency of radial inflow turbine is decreased gradually.Lower axial velocity of the back cavity leakage flow can weaken the negative influence of the back cavity and seal gas and increases the isentropic efficiency of radial inflow turbine under variable operating conditions.
作者
王星
朱阳历
张雪辉
李文
陈海生
WANG Xing;ZHU Yang-Li;ZHANG Xue-Hui;LI Wen;CHEN Hai-Sheng(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第1期104-112,共9页
Journal of Engineering Thermophysics
基金
北京市自然科学基金资助项目(No.3184063)
中科院洁净能源先导科技专项(No.XDA21070200)
中国科学院前沿科学重点研究项目(No.QYZDB-SSW-JSC023)
北京市科技计划项目(No.D16110004616001,No.D16110004616002)
关键词
压缩空气储能
向心涡轮
轮背空腔
密封气
CFD
compressed air energy storage
radial inflow turbine
back cavity
seal gas
CFD
作者简介
王星(1986-),男,助理研究员,博士,主要从事透平膨胀机的设计优化研究;通信作者:陈海生,研究员,E-mail:chen_hs@mail.etp.ac.cn.
