CAJ | 학술논문

为了探讨冷热流体真实温比与小温比的气膜冷却特性差别,采用湍流模型及 Fluent 软件,对吹风比Br分别为0．5和2．0,温比Tr分别为1．1和2．0的双向扩张孔射流气膜的流场、温度场和冷却效率分布进行研究.结果表明：Br＝0．5时,2种温比下的冷气扩散基本一致,径向平均冷却效率差别不大；Br＝2．0时,Tr＝2．0的冷气径向扩散优于Tr＝1．1的,径向平均冷却效率较Tr＝1．1时增幅13．4％~55．5％.
위료탐토랭열류체진실온비여소온비적기막냉각특성차별,채용단류모형급 Fluent 연건,대취풍비Br분별위0．5화2．0,온비Tr분별위1．1화2．0적쌍향확장공사류기막적류장、온도장화냉각효솔분포진행연구.결과표명：Br＝0．5시,2충온비하적랭기확산기본일치,경향평균냉각효솔차별불대；Br＝2．0시,Tr＝2．0적랭기경향확산우우Tr＝1．1적,경향평균냉각효솔교Tr＝1．1시증폭13．4％~55．5％.
To explore the difference of film cooling characteristics between small temperature ratio and real temperature ratio of the coolant and gas,the flow field,temperature field and film cooling efficiency of 3-in-1 hole inj ection film were studied,on the basis of Fluent software,by using the realizable k-εmodel with temperature ratio of 1.1 and 2.0,the blowing ratio of 0.5 and 2.0.The results show that,at blowing ratio of 0.5,the diffusions of coolant with both temperature ratios are identical and the radial average cool-ing efficiency has little difference.At blowing ratio of 2.0,the coolant radial diffusion with temperature ra-tio of 2.0 is better than that with temperature ratio of 1.1.The radial average cooling efficiency with tem-perature ratio of 2.0 is about 13.4% to 55.5% higher.