Numerical and experimental investigation of a new film cooling geometry with high P/D ratio
File(s)
Accepted version
Author(s)
Montomoli, F
D'Ammaro, A
Uchida, S
Type
Journal Article
Abstract
In order to improve the coolant surface coverage, in the past years new geometries have been proposed with higher lateral fan-shaped angle and/or greater inter-hole pitch distance (P/D). Unfortunately it is not possible to increase the fan angle or the pitch distance even further without inducing a coolant separation and a drop in the overall effectiveness. This study proposes an innovative design which improves the lateral coverage and reduces the jet lift off. The results have been validated by a combination of numerical and experimental analyses: the experimental work has been assessed on a flat plate using thermo chromic liquid crystals and the results have been confirmed numerically by the CFD with the same conditions. The CFD simulations have been carried out considering a stochastic distribution for the free stream Mach number and the coolant blowing ratio. The experimental and computational results show that the inducing lateral pressure gradients there is a minimum increase in lateral averaged adiabatic effectiveness of +30% than the baseline case until a distance downstream of 20 times the coolant diameter. © 2013 Elsevier Ltd. All rights reserved.
Date Issued
2013-08-19
ISSN
0017-9310
Start Page
366
End Page
375
Journal / Book Title
International Journal of Heat and Mass Transfer
Volume
66
Copyright Statement
© 2013 Elsevier Ltd. All rights reserved.
Description
04/09/14 meb. accepater, author version, OK to add.