NACA-TM-3123

Effect of various arrangements of triangular ledges on the performance of a 23 degree conical diffuser at subsonic Mach numbers

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T16:57:56Z
date available	2017-09-04T16:57:56Z
date copyright	01/01/1954
date issued	1954
identifier other	BWONEEAAAAAAAAAA.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/121335
description abstract	A brief investigation has been made to determine whether the use of annular ledges to promote turbulent momentum exchange will improve the performance of a short, wide-angle diffuser. Results are presented of tests of a 23º conical diffuser with a 2:1 ratio of exit to inlet area with both rough and smooth triangular ledges, approximately one-tenth of the inlet boundary-layer thickness in height, installed in succession from the inlet to the exit. The results show that, although the flow in the diffuser without ledges was very unstable, the presence of a roughness strip near the inlet, with or without additional ledges, assured stable flow. For the configurations investigated, the static-pressure recovery and the total-pressure-loss coefficient were either unaffected or only slightly impaired by the installation of the ledges.
language	English
title	NACA-TM-3123	num
title	Effect of various arrangements of triangular ledges on the performance of a 23 degree conical diffuser at subsonic Mach numbers	en
type	standard
page	37
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1954
contenttype	fulltext