Effects of mainstream angles of attack on film cooling characteristics of double-jet film cooling holes - Details

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Abstract：

Film　cooling　effectiveness　of　double-jet　film　cooling　holes　was　measured　using　pressure　sensitive　paint　at　various　mainstream　angles　of　attack　(i=-30°,　-20°,　-10°,　0°,　10°,　20°,　30°)　on　a　flat　plate,　and　the　flow　field　obtained　by　computational　fluid　dynamics　(CFD)　was　used　to　analyze　the　film　cooling　effectiveness.　The　dimension　less　spanwise　distance　was　0.5,　the　dismension　less　streamwise　distance　was　3;　the　density　ratio　was　1.　0,　and　the　blowing　ratio　varied　as　0.5,　1.0,　1.5,　2.0.　The　results　showed　that,　at　small　mainstream　angles　of　attack　(i=-10°,　0°,　10°),　the　film　layer　attached　well　with　wall　because　of　the　anti-kidney　vortex　pair　or　the　pressing　effect　in　the　flow　field,　contributing　to　the　highest　film　cooling　effectiveness;　at　large　positive　angles　of　attack　(i=20°,　30°),　the　anti-kidney　vortex　pair　degenerated　though　the　coverage　area　of　film　was　the　largest,　the　film　cooling　effectiveness　became　lower;　at　large　negative　angles　of　attack　(i=-20°,　-30°),　there　existed　kidney　vortex　pair,　the　lateral　coverage　of　the　film　was　limited　and　the　film　cooling　effectiveness　was　lowest.　©　2020,　Editorial　Department　of　Journal　of　Aerospace　Power.　All　right　reserved.

Keyword：

Angle of attack Computational fluid dynamics Cooling Flow fields Paint Vortex flow

Author Community：

[ 1 ] [He, Jianhong]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 2 ] [He, Jianhong]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 3 ] [Zhang, Ke]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 4 ] [Zhang, Ke]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 5 ] [Yang, Xi]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 6 ] [Yang, Xi]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 7 ] [Duan, Jingtian]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 8 ] [Duan, Jingtian]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 9 ] [Wu, Junmei]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 10 ] [Wu, Junmei]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 11 ] [Lei, Jiang]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China
[ 12 ] [Lei, Jiang]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China

Reprint Author's Address：

[Lei, Jiang]State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China;;[Lei, Jiang]National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an; 710049, China;;

Email：

leijiang@mail.xjtu.edu.cn

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