某重型燃气轮机燃烧室冲击冷却特性研究  

Research of Impingement Cooling Performance for a Heavy-duty Gas Turbine Combustor

作　　者：冯珍珍[1] 田晓晶 李洋 凤云仙[1] 艾松[1] FENG Zhen-zhen;TIAN Xiao-jing;LI Yang;FENG Yun-xian;AI Song(Dongfang Turbine Company Limited,Deyang 618000,China)

机构地区：[1]东方汽轮机有限公司,德阳618000

出　　处：《汽轮机技术》2020年第4期275-278,250,共5页Turbine Technology

摘　　要：冲击冷却具有较高换热系数,在燃气轮机燃烧室得到重要应用。通过流固耦合传热(Coupled Heat Transfer,CHT)计算方法研究了冲击冷却孔排列方式、冲击高度与冷却孔径之比Z n/D和初始横流对某重型燃机燃烧室火焰筒冲击冷却特性的影响。得到如下结论:三者对冲击换热效率均有显著影响,其中Z n/D=3.7时,直列阵列相邻列之间的横流更规则,冷却效果优于错排阵列;当Z n/D在2.0~6.0范围内时,随着Z n/D的增大,冷却效率呈现先增大后减小的趋势,存在一个最佳换热范围2.7≤Z n/D≤4.6,此时射流冷却与对流冷却匹配合理,冷却效率较高;初始横流对冲击冷却性能有很大削弱作用,应在设计时尽量避免。Impingement cooling has high heat transfer coefficient and has been widely used in gas turbine combustors.In this paper,the effects of the arrangement of impinging cooling holes,the ratio of impinging height to hole diameter(Z n/D)and the initial crossflow on the impinging cooling characteristics of the combustion chamber of a heavy-duty gas turbine were studied by Coupled Heat Transfer(CHT)calculation method.It is found that all of the three factors have significant effects on impingement heat transfer efficiency.The following conclusions could be drawn:(1)When Z n/D=3.7,the crossflow between adjacent rows of inline pattern is more regular than staggered pattern.(2)When Z n/D is in the range of 2.0~6.0,with the increase of Z n/D,the cooling efficiency increases first and then decreases.There is an optimum heat transfer range of 2.7≤Z n/D≤4.6.In this range,the matching between impingement cooling and convection cooling is reasonable and the cooling efficiency is high.(3)The initial crossflow has a great weakening effect on the impingement cooling performance,which should be avoided as far as possible during the design phase.

关 键 词：燃烧室火焰筒 冲击冷却 耦合传热 冷却效率 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]