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contributor authorChristian Saumweber
contributor authorAchmed Schulz
contributor authorSigmar Wittig
date accessioned2017-05-09T00:11:45Z
date available2017-05-09T00:11:45Z
date copyrightJanuary, 2003
date issued2003
identifier issn0889-504X
identifier otherJOTUEI-28700#65_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/129293
description abstractA comprehensive set of generic experiments has been conducted to investigate the effect of elevated free-stream turbulence on film cooling performance of shaped holes. A row of three cylindrical holes as a reference case, and two rows of holes with expanded exits, a fanshaped (expanded in lateral direction), and a laidback fanshaped hole (expanded in lateral and streamwise direction) have been employed. With an external (hot gas) Mach number of Mam=0.3 operating conditions are varied in terms of free-stream turbulence intensity (up to 11%), integral length scale at constant turbulence intensity (up to 3.5 hole inlet diameters), and blowing ratio. The temperature ratio is fixed at 0.59 leading to an enginelike density ratio of 1.7. The results indicate that shaped and cylindrical holes exhibit very different reactions to elevated free-stream turbulence levels. For cylindrical holes film cooling effectiveness is reduced with increased turbulence level at low blowing ratios whereas a small gain in effectiveness can be observed at high blowing ratios. For shaped holes, increased turbulence intensity is detrimental even for the largest blowing ratio (M=2.5). In comparison to the impact of turbulence intensity the effect of varying the integral length scale is found to be of minor importance. Finally, the effect of elevated free-stream turbulence in terms of heat transfer coefficients was found to be much more pronounced for the shaped holes.
publisherThe American Society of Mechanical Engineers (ASME)
titleFree-Stream Turbulence Effects on Film Cooling With Shaped Holes
typeJournal Paper
journal volume125
journal issue1
journal titleJournal of Turbomachinery
identifier doi10.1115/1.1515336
journal fristpage65
journal lastpage73
identifier eissn1528-8900
keywordsCooling
keywordsTurbulence
keywordsDensity AND Coolants
treeJournal of Turbomachinery:;2003:;volume( 125 ):;issue: 001
contenttypeFulltext


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