重型燃气轮机是一种用于发电和工业应用的高效能源转换设备。排气扩压器与上游流场的相互作用及其复杂的几何结构,导致了扩压器内流场特征,影响整个燃机的效率。本文利用数值模拟的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(Cpt)和同轴度()等参数评价排气扩压器系统的气动性能。研究得出:支撑板与导片轴向距离变化Cp系数和Cpt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旋转角度增加的Cp系数先增加再减小, Cpt系数先减小再增加,旋转角度为20°时相较于转角度为0°时的工况Cp系数提高了4.27%, Cpt系数降低了7.71%,且此时系数高,Cp系数径向分布均匀、周向差别小。

Heavy duty gas turbines are efficient energy conversion equipment used for power generation and industrial applications. The interaction and complex geometric structure between the exhaust diffuser and the upstream flow field result in the flow field characteristics inside the diffuser, which affects the efficiency of the entire gas turbine. This article uses numerical simulation methods to study the diffuser structure of a heavy-duty gas turbine exhaust system, based on the static pressure recovery coefficient (Cp), total pressure loss coefficient (Cpt), and Axial degree（?）Evaluate the aerodynamic performance of the exhaust diffuser system with equal parameters. The study found that the Cp coefficient and Cpt coefficient did not improve when the axial distance between the support plate and the guide vane changed, but the aerodynamic performance decreased instead; As the rotation angle of the support plate and guide vane increases, the Cp coefficient increases first and then decreases, and the Cpt coefficient decreases first and then increases. When the rotation angle is 20 °, the Cp coefficient increases by 4.27% compared to the working condition when the rotation angle is 0 °, and the Cpt coefficient decreases by 7.71% ? High coefficient, uniform radial distribution of Cp coefficient, and small circumferential difference.

航空发动机及燃气轮机基础科学中心项目（P2022-C-I-001-001)；上海市重型燃气轮机领域联合创新计划(UIC计划)资助项目，《重型燃机部件级气动设计仿真和试验研究》