Film-Cooling Performance with Various Hole Length to Diameter Ratios for Cylindrical and Laidback Fan-Shaped Holes with an Inlet Groove  

作　　者：PARK Jisu KIM Jun-Hee KANG Changwoo 

机构地区：[1]Department of Mechanical Engineering,Jeonbuk National University,567 Baekje-daero,Deokjin-gu,Jeonju-si,Jeollabuk-do,54896,Republic of Korea [2]Research Institute of Industrial Science&Technology,187-12 Geumho-ro,Gwangyang-si,Jeollanam-do,57801,Republic of Korea [3]Laboratory for Renewable Energy and Sector Coupling,Jeonbuk National University,567 Baekje-daero,Deokjin-gu,Jeonju-si,Jeollabuk-do,54896,Republic of Korea

出　　处：《Journal of Thermal Science》2025年第2期607-625,共19页热科学学报(英文版)

基　　金：supported by National University Development Project at Jeonbuk National University in 2023。

摘　　要：The influence of the hole length-to-diameter ratio on film-cooling performance is numerically investigated for a cylindrical hole and laidback fan-shaped hole with an inlet groove.Numerical analysis of film-cooling is conducted by solving three-dimensional Reynolds-averaged Navier-Stokes equations(RANS)with a Realizable k-εturbulence model.Rectangular and triangular grooves are applied to the inlet of cylindrical and laidback fan-shaped holes.The ratio of the hole length(L)to the diameter(D),i.e.,L/D,is varied between 6-12 at blowing ratios(M)of 0.5 to 1.5 for the cylindrical hole and 0.5 to 3.0 for the laidback fan-shaped hole.For cylindrical holes with an inlet groove,the film-cooling effectiveness decreases as the L/D increases,regardless of the blowing ratio.However,in the case of laidback fan-shaped holes,the cooling performance with the length-to-diameter ratios shows different tendencies for each blowing ratio.At low blowing ratios(M=1.0),relatively high effects were observed with more than 5%increases in the effectiveness at L/D=10 and 12 compared to that of L/D=6.However,the performance is maximized at L/D=8 under high-blowing-ratio conditions(M=3.0).The cooling efficiency is enhanced up to 148%for square grooves and 124%for triangle grooves compared to those of L/D=6.

关 键 词：film-cooling inlet groove film-cooling effectiveness numerical analysis Reynolds-averaged Navier-Stokes equations 

分 类 号：O35[理学—流体力学]