IMPINGEMENT HEAT TRANSFER FROM RIB ROUGHENED SURFACE WITHIN ARRAYS OF CIRCULAR JET Part I:The Effect of the Initial Crossflow  

圆射流阵列冲击肋粗糙表面换热第I部分:初始横流的影响

作　　者：Chang Haiping Zhang Dalin Han Dong Huang Taiping 常海萍;张大林;韩东;黄太平(南京航空航天大学动力工程系南京,210016)

机构地区：[1]Department of Power Engineering,NUAA 29 Yudao Street,Nanjing 210016,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》1996年第1期64-70,共7页南京航空航天大学学报(英文版)

摘　　要：Impingement heat transfer from the rib roughened surface within 2 dimensional arrays of circular jet has been experimentally investigated.This investigation is intended here to include the flow and the heat transfer characteristics of the jet impinging on the rib roughened surface with initial crossflow for simulating the impingement cooling midchord region of the gas turbine aerofoils in case where an initial crossflow is presented.The study covered the ranges of crossflow G_(c)/G_(j)=0~0.55 under the conditions of Re_(j)=8000~11000 and Z/d=1.5~3.0 for smooth and rib roughened surfaces.The test results show that the impingement heat transfer from the rib roughened surface is considerably affected by the initial crossflow rate.The existence of the initial crossflow will improve the efficiency of the impingement heat transfer from the rib roughened surface within arrays of circular jet compared with that from the smooth surface.实验研究了二维圆射流阵列冲击肋粗糙表面换热。所研究的具有初始横流对肋粗糙表面的冲击流动与换热特性,是为了模拟存在初始横流的涡轮叶片中弦区的冲击冷却。研究包括Re_(j)=8000~11000,Z/d=1.5~3.0条件下的光滑表面与肋粗糙表面,横流率为G_(c)/G_(j)=0~0.55范围内。实验结果表明,初始横流率对肋粗糙表面的冲击换热有重要的影响。与光滑表面相比,圆射流阵列冲击肋粗糙表面的换热效率。

关 键 词：heat transfer flow impingement cooling rib roughened surface initial crossflow 

分 类 号：V512.4[航空宇航科学与技术—航空宇航推进理论与工程]