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A Computational Study for the Discharge Coefficient of a Film-Cooling Hole  

김재형 (안동대학교 기계공학과 대학원)
김희동 (안동대학교 기계공학부)
박경암 (한국표준과학연구원 유체유동그룹)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.7, no.2, 2003 , pp. 15-22 More about this Journal
Abstract
Computational study using the 2-dimensional, compressible, Navier-Stokes equations is performed to predict the discharge coefficient of air flow through a film-cooling hole. In order to investigate the effect of internal/external flows on discharge coefficient, the present computational results which are obtained for three flow cases, only external flow, only internal flow, and no flow, are compared with experimental ones. It is found that the computational results predict the discharge coefficient of the film-cooling hole in a reasonable accuracy and the external crossflow reduces the discharge coefficient, while the internal crossflow increases the discharge coefficient in a range of momentum flux ratio $I_{c-jet}$ > 1 due to the total pressure loss and boundary layer effect.
Keywords
Film-cooling; Discharge coefficient; Compressible flow; Momentum flux ratio;
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