Effects of Free-Stream Turbulence on Diffuser PerformanceSource: Journal of Fluids Engineering:;1981:;volume( 103 ):;issue: 003::page 385Author:J. A. Hoffmann
DOI: 10.1115/1.3240795Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An experimental evaluation of the effects of free-stream turbulence on the performance of a subsonic two-dimensional diffuser has been made. Increases of the diffuser’s static pressure recovery coefficient of 11.3 and 23.9 percent at total included divergence angles of 12 and 20 degrees respectively were obtained when the value of the inlet integral free-stream scale of turbulence in the flow direction was at least 7.2 times larger than the inlet boundary layer displacement thickness, when the inlet total free-stream turbulence intensity was at least 3.5 percent, and when the axes of upstream rods used to generate turbulence were perpendicular to the flow and parallel to the diverging walls of the diffuser. It is hypothesized that a larger scale of turbulence with the specified eddy axis orientation transmits the free-stream energy to the walls more effectively and, when coupled with large turbulence intensities, are mechanisms which act to decrease the distortion and delay separation within the diffuser.
keyword(s): Turbulence , Diffusers , Flow (Dynamics) , Separation (Technology) , Eddies (Fluid dynamics) , Boundary layers , Delays , Displacement , Rods , Thickness , Mechanisms AND Pressure ,
|
Collections
Show full item record
contributor author | J. A. Hoffmann | |
date accessioned | 2017-05-08T23:11:21Z | |
date available | 2017-05-08T23:11:21Z | |
date copyright | September, 1981 | |
date issued | 1981 | |
identifier issn | 0098-2202 | |
identifier other | JFEGA4-26975#385_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/94693 | |
description abstract | An experimental evaluation of the effects of free-stream turbulence on the performance of a subsonic two-dimensional diffuser has been made. Increases of the diffuser’s static pressure recovery coefficient of 11.3 and 23.9 percent at total included divergence angles of 12 and 20 degrees respectively were obtained when the value of the inlet integral free-stream scale of turbulence in the flow direction was at least 7.2 times larger than the inlet boundary layer displacement thickness, when the inlet total free-stream turbulence intensity was at least 3.5 percent, and when the axes of upstream rods used to generate turbulence were perpendicular to the flow and parallel to the diverging walls of the diffuser. It is hypothesized that a larger scale of turbulence with the specified eddy axis orientation transmits the free-stream energy to the walls more effectively and, when coupled with large turbulence intensities, are mechanisms which act to decrease the distortion and delay separation within the diffuser. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Effects of Free-Stream Turbulence on Diffuser Performance | |
type | Journal Paper | |
journal volume | 103 | |
journal issue | 3 | |
journal title | Journal of Fluids Engineering | |
identifier doi | 10.1115/1.3240795 | |
journal fristpage | 385 | |
journal lastpage | 390 | |
identifier eissn | 1528-901X | |
keywords | Turbulence | |
keywords | Diffusers | |
keywords | Flow (Dynamics) | |
keywords | Separation (Technology) | |
keywords | Eddies (Fluid dynamics) | |
keywords | Boundary layers | |
keywords | Delays | |
keywords | Displacement | |
keywords | Rods | |
keywords | Thickness | |
keywords | Mechanisms AND Pressure | |
tree | Journal of Fluids Engineering:;1981:;volume( 103 ):;issue: 003 | |
contenttype | Fulltext |