Show simple item record

contributor authorLesley M. Wright
contributor authorStephen T. McClain
contributor authorMichael D. Clemenson
date accessioned2017-05-09T00:47:19Z
date available2017-05-09T00:47:19Z
date copyrightOctober, 2011
date issued2011
identifier issn0889-504X
identifier otherJOTUEI-28776#041023_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147775
description abstractAn experimental investigation of film cooling jet structure using two-dimensional particle image velocimetry (PIV) has been completed for cylindrical, simple angle (θ=35 deg) film cooling holes. The PIV measurements are coupled with detailed film cooling effectiveness distributions on the flat plate obtained using a steady state, pressure sensitive paint (PSP) technique. Both the flow and surface measurements were performed in a low speed wind tunnel where the freestream turbulence intensity was varied from 1.2% to 12.5%. With this traditional film cooling configuration, the blowing ratio was varied from 0.5 to 1.5 to compare the jet structure of relatively low and high momentum cooling flows. Velocity maps of the coolant flow (in the streamwise direction) are obtained on three planes spanning a single hole: centerline, 0.25D, and 0.5D (outer edge of the film cooling hole). From the seeded jets, time averaged, mean velocity distributions of the film cooling jets are obtained near the cooled surface. In addition, turbulent fluctuations are obtained for each flow condition. Combining the detailed flow field measurements obtained using PIV (both instantaneous and time averaged) with detailed film cooling effectiveness distributions on the surface (PSP) provides a more complete view of the coolant jet-mainstream flow interaction. Near the edge of the film cooling holes, the turbulent mixing increases, and as a result the film cooling effectiveness decreases. Furthermore, the PIV measurements show the increased mixing of the coolant jet with the mainstream at the elevated freestream turbulence level resulting in a reduction in the jet to effectively protect the film cooled surface.
publisherThe American Society of Mechanical Engineers (ASME)
titleEffect of Freestream Turbulence Intensity on Film Cooling Jet Structure and Surface Effectiveness Using PIV and PSP
typeJournal Paper
journal volume133
journal issue4
journal titleJournal of Turbomachinery
identifier doi10.1115/1.4003051
journal fristpage41023
identifier eissn1528-8900
keywordsFlow (Dynamics)
keywordsCooling
keywordsTurbulence
keywordsCoolants AND Jets
treeJournal of Turbomachinery:;2011:;volume( 133 ):;issue: 004
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record