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为了获得涡轮转子叶片内部冷却结构的冷却性能,采用气热耦合计算的方法分析了在相同冷气总量条件下3种不同的气流组织方式对叶片冷却效果的影响,并选择其中相对优化的冷却结构进行了转速对进气压力和综合冷却效率的影响研究。结果表明,B型结构叶片气流组织较为合理,表面温度较为均匀,整体冷却效率得到有效提高;哥氏力和离心浮升力的存在导致冷却气流发生相应偏转,前缘滞止线随转速增加由压力面向吸力面偏移,同时前缘气膜出流随转速发生变化,随着转速增大,压力面综合冷却效率提高,吸力面综合冷却效率下降。
In order to obtain the cooling performance of the internal cooling structure of the turbine rotor blade, the effects of three different airflow patterns on the cooling efficiency of the blade under the same total air-cooling conditions were analyzed by using the method of air-heat coupling calculation, and the relatively optimized cooling structure The effects of rotational speed on intake pressure and overall cooling efficiency were studied. The results show that the airflow structure of the B-type structure is more reasonable, the surface temperature is more uniform, and the overall cooling efficiency is effectively improved. The Coriolis force and the centrifugal floating force cause the cooling airflow to deflect accordingly. The stagnation line of the leading edge increases with the increase of the speed While the outflow of the leading edge gas film changes with the rotation speed. With the increase of rotation speed, the cooling efficiency of the pressure surface increases, and the cooling efficiency of the suction surface decreases.