【摘要】 采用数值计算的方法,对带有前导静叶的旋转涡轮动叶流场和气膜冷却效率进行了三维非定常数值模拟,研究了静叶非定常尾迹对涡轮动叶气膜孔周围流场及冷却效率的影响。结果表明,在不同的动、静叶相位,尾迹的存在改变了涡轮动叶入口来流的周向分布,对射流和主流的掺混流场产生了周期性的影响,使得压力面不同时刻的气膜冷却效率存在一定的波动,而吸力面气膜冷却效率的波动则相对较小。更多还原

【Abstract】 By using a numerical calculation method,a three dimensional unsteady numerical simulation was performed of the flow field and air-film cooling efficiency of rotating blades of a turbine with pre-guide stator blades.In this connection,the influence of the unsteady wake of the stator blades on the flow field around the air-film holes of the rotating blades of the turbine and the cooling efficiency was also studied.It has been found that at different phase positions of the rotor and stator blades,the presence of the wakes changes the distribution of the incoming flow from the inlet of the rotor blades of the turbine along the circumferential direction and produces a periodical influence on the mixing and diluting flow field of the jet and main flow,forcing the air-film cooling efficiency of the pressure surface fluctuated to a certain extent at different times while that of the suction surface fluctuated to a relatively small extent.更多还原