燃气轮机排气扩压器结构对气动性能影响的数值模拟研究  

Numerical Simulation Study on the Influence of Gas Turbine Exhaust Diffuser Structure on Aerodynamic Performance

作　　者：曾令艳 施奇良 张华 李新元 ZENG Lingyan;SHI Qiliang;ZHANG Hua;LI Xinyuan(School of Mechanical Engineering,Shanghai DianJi University,Shanghai,China,201306;China United Gas Turbine Technology Co.,Ltd.,Shanghai,China,201306)

机构地区：[1]上海电机学院机械学院,上海201306 [2]中国联合重型燃气轮机技术有限公司,上海201306

出　　处：《热能动力工程》2025年第1期59-68,共10页Journal of Engineering for Thermal Energy and Power

摘　　要：为提高重型燃气轮机排气扩压器的气动性能,利用数值模拟方法对某重型燃气轮机排气系统的扩压器结构进行研究,依据静压恢复系数(Cp)、总压损失系数(Cp_(t))和同轴度(ϑ)等参数评价排气扩压器系统的气动性能。研究得出:在支撑板与导片轴向距离变化时,Cp系数和Cp_(t)系数没有得到提升,气动性能反而下降;支撑板与导片旋转角度增加时,Cp系数先增加再减小,Cp_(t)系数先减小再增加;旋转角度为20°时相较于旋转角度为0°时的Cp系数提高了4.27%,Cp_(t)系数降低了7.71%,且此时ϑ系数高,Cp系数径向分布均匀、周向差别小。In order to improve the aerodynamic performance of the heavy-duty gas turbine exhaust diffus-er,numerical simulation method was used to study the diffuser structure of a heavy-duty gas turbine ex-haust system,and evaluate the aerodynamic performance of the exhaust diffuser system based on the pa-rameters including static pressure recovery coefficient(Cp),total pressure loss coefficient(Cp_(t))and co-axial degree(ϑ).The study shows that the Cp coefficient and Cp_(t)coefficient are not improved when the axial distance between the support plate and the guide vane changes,while the aerodynamic performance decreases;as the rotation angles of the support plate and guide vane increase,the Cp coefficient increa-ses first and then decreases,and the Cp_(t)coefficient decreases first and then increases.When the rotation angle is 20°,the Cp coefficient increases by 4.27%,and the Cp_(t)coefficient decreases by 7.71%com-pared with that under the working condition of 0°rotation angle,with highϑcoefficient,uniform radial distribution of Cp coefficient,and small circumferential difference.

关 键 词：燃气轮机 排气扩压器 气动性能 数值模拟 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]