中文摘要：

通过三维非定常数值计算,研究了透平进口存在热斑及总压梯度时静叶正弯引起的高压燃气透平气热性能变化,分析了静叶正弯对动叶壁面、叶顶和端壁热负荷的影响。结果表明：静叶正弯改变了静叶吸力面静压及载荷分布,削弱了端壁二次流,使透平效率略有增加;同时静叶正弯增强了静叶吸力面侧流体从端壁向叶片中部的迁移,削弱了热斑的径向耗散。总压梯度的存在使静叶正弯不会引起动叶壁面二次流结构的显著变化,但热斑耗散程度的减弱会影响动叶热负荷分布。静叶正弯使动叶压力面高热负荷区传热恶化,但可以显著削弱动叶叶顶、下端壁及机匣的高温区域。

英文摘要：

Unsteady numerical simulations were conducted to reveal the influence of vane positive lean on aero-thermal performance of a high pressure turbine stage with inlet hot streak and pressure nonuniformity.Heat load variations on rotor blade,tip and end wall caused by the leaned vane were analyzed.The results show that the leaned vane changes the pressure distributions especially on vane suction surface and the vane loading,thus the intensity of stator end wall secondary flow is weakened and the turbine isentropic efficiency is increased slightly.Moreover,the leaned vane enhances the radial migration of fluid near the vane endwall of suction side toward the mid-region,thus the hot streak attenuation in radial direction is decreased.For the existing of inlet pressure nonuniformity,the secondary flow structure on rotor pressure surface would not markedly altered by the leaned vane,however,the decrease of hot streak attenuation changes the rotor heat load distribution.The positive leaned vane worsen the heat transfer on rotor pressure surface,while the rotor blade tip,hub and casing heat load are reduced significantly.