摘要
采用数值模拟的方法对旋转涡轮叶片表面的气膜冷却效率进行了研究,同时对涡轮静叶栅和动叶片在不同的旋转速度下分别进行计算,分析不同转速、吹风比和冷却气流喷射角度对气膜冷却的影响。计算结果表明,旋转使压力面气膜冷却效率降低,转速越高,气膜冷却效率越低;在吸力面冷却孔下游附近区域,叶片旋转对气膜冷却效率的影响不大,但叶片旋转使离冷却孔较远处的吸力面冷却效率升高。同时,在旋转状态下,靠近叶顶区域的叶片表面气膜冷却效率升高。
Film cooling effectiveness of rotating turbine blades has been investigated by numerical simulation. Calculations of turbine stationary blade cascades were carried out, and also calculations of moving blades under different rotational speed conditions. The effect of rotational velocity, blowing rate and incidence angle of the cooling air jet on film cooling have been analyzed. Calculation results show that rotation causes film cooling effectiveness on the pressure surface to drop-the quicker the rotation the lower the cooling effectiveness ; blade rotation affects film cooling but little in the region just downstream the cooling orifices on the suction surface, but causes it to rise on the suction surface farther away from the cooling orifice. In the region near blade tip, rotation causes film cooling effectiveness on the blade surface to increase. Figs 12 and refs 6.
出处
《动力工程》
EI
CSCD
北大核心
2007年第2期161-164,共4页
Power Engineering
基金
国家自然科学基金(50406017)资助项目
关键词
动力机械工程
旋转涡轮
叶栅
气膜冷却效率
数值模拟
power and mechanical engineering
rotating turbine
blade cascade
film cooling effectiveness
numerical simulation
