叶顶间隙对多级轴流压气机性能退化的影响  

Effects of Blade Tip Clearance on Performance Degradation of the Multi-stage Axial Compressor

作　　者：肖俊峰[1] 伍赫 高松[1] 李园园[1] 于飞龙[1] 段静瑶 何伟 张蒙[1] XIAO Junfeng;WU He;GAO Song;LI Yuanyuan;YU Feilong;DUAN Jingyao;HE Wei;ZHANG Meng(Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China)

机构地区：[1]西安热工研究院有限公司,西安710054

出　　处：《动力工程学报》2024年第9期1353-1360,共8页Journal of Chinese Society of Power Engineering

基　　金：国家科技重大专项资助项目(2019-I-0003-0004);华能集团科技资助项目(HNKJ22-H16);西安热工院科研资助项目(TI-23-TYK26)。

摘　　要：以某F级燃机压气机为研究对象,考虑燃机实际运行过程中腐蚀和磨损作用导致的压气机叶顶间隙变化,通过三维数值模拟方法开展了不同腐蚀/磨损状态下多级轴流压气机的性能退化机理研究,分析了叶顶间隙变化对多级轴流压气机性能的影响规律。结果表明:叶顶间隙增大会导致压气机特性曲线整体向质量流量减小的方向偏移,使得压气机的质量流量、效率及压比均产生一定程度的衰退;随着叶顶间隙的增大,压气机峰值效率逐渐降低,喘振裕度明显降低;叶顶间隙增大会导致压气机通道内的流动分离加剧,动叶叶顶间隙变化对压气机流动分离的影响更严重;静叶吸力面尾缘附近的流动分离导致形成低马赫数区,同时逆流的低速涡团导致叶根附近的损失显著增大,造成压气机性能衰退。Taking the F-class gas turbine compressor as the research object,the performance degradation mechanism of multi-stage axial compressor at different states of corrosion/ware was studied by three-dimensional numerical simulation,considering the changes in blade tip clearance caused by corrosion and wear during actual operation of gas turbine.The influence of tip clearance on the performance of multi-stage axial compressor was analyzed.Results show that the increase of tip clearance causes the characteristic curves of the compressor to move towards the direction of mass flow reduction as a whole,resulting in certain degree of decline of mass flow,efficiency and pressure ratio.With the increase of tip clearance,the compressor maximum efficiency decreases gradually,and the surge margin decreases obviously.The increase of tip clearance also results in intensified flow separation inside the compressor,and the change of tip clearance of rotors has more serious impact on flow separation inside the compressor.The flow separation near the trailing edge of the suction surface of stators leads to the formation of a low Mach number region,and the loss near the stator root increases obviously due to the countercurrent low-speed vortices,resulting in the decline of compressor performance.

关 键 词：多级轴流压气机 叶顶间隙 性能退化 特性线 数值模拟 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]