contributor author | J. P. Bons | |
contributor author | C. D. MacArthur | |
contributor author | R. B. Rivir | |
date accessioned | 2017-05-08T23:51:51Z | |
date available | 2017-05-08T23:51:51Z | |
date copyright | October, 1996 | |
date issued | 1996 | |
identifier issn | 0889-504X | |
identifier other | JOTUEI-28655#814_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/117813 | |
description abstract | This study investigated the adiabatic wall cooling effectiveness of a single row of film cooling holes injecting into a turbulent flat plate boundary layer below a turbulent, zero pressure gradient free stream. Levels of free-stream turbulence (Tu) up to 17.4 percent were generated using a method that simulates conditions at a gas turbine combustor exit. Film cooling was injected from a single row of five 35 deg slant-hole injectors (length/diameter = 3.5, pitch/diameter = 3.0) at blowing ratios from 0.55 to 1.85 and at a nearly constant density ratio (coolant density/free-stream density) of 0.95. Film cooling effectiveness data are presented for Tu levels ranging from 0.9 to 17 percent at a constant free-stream Reynolds number based on injection hole diameter of 19,000. Results show that elevated levels of free-stream turbulence reduce film cooling effectiveness by up to 70 percent in the region directly downstream of the injection hole due to enhanced mixing. At the same time, high free-stream turbulence also produces a 50–100 percent increase in film cooling effectiveness in the region between injection holes. This is due to accelerated spanwise diffusion of the cooling fluid, which also produces an earlier merger of the coolant jets from adjacent holes. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | The Effect of High Free-Stream Turbulence on Film Cooling Effectiveness | |
type | Journal Paper | |
journal volume | 118 | |
journal issue | 4 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.2840939 | |
journal fristpage | 814 | |
journal lastpage | 825 | |
identifier eissn | 1528-8900 | |
keywords | Cooling | |
keywords | Turbulence | |
keywords | Density | |
keywords | Coolants | |
keywords | Jets | |
keywords | Combustion chambers | |
keywords | Boundary layers | |
keywords | Ejectors | |
keywords | Gas turbines | |
keywords | Flat plates | |
keywords | Pressure gradient | |
keywords | Diffusion (Physics) | |
keywords | Fluids AND Reynolds number | |
tree | Journal of Turbomachinery:;1996:;volume( 118 ):;issue: 004 | |
contenttype | Fulltext | |