contributor author | Christian Saumweber | |
contributor author | Achmed Schulz | |
contributor author | Sigmar Wittig | |
date accessioned | 2017-05-09T00:11:45Z | |
date available | 2017-05-09T00:11:45Z | |
date copyright | January, 2003 | |
date issued | 2003 | |
identifier issn | 0889-504X | |
identifier other | JOTUEI-28700#65_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/129293 | |
description abstract | A 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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Free-Stream Turbulence Effects on Film Cooling With Shaped Holes | |
type | Journal Paper | |
journal volume | 125 | |
journal issue | 1 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.1515336 | |
journal fristpage | 65 | |
journal lastpage | 73 | |
identifier eissn | 1528-8900 | |
keywords | Cooling | |
keywords | Turbulence | |
keywords | Density AND Coolants | |
tree | Journal of Turbomachinery:;2003:;volume( 125 ):;issue: 001 | |
contenttype | Fulltext | |