Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes

This study investigates the effect of sudden expansion of air in cylindrical pipes of varied area (AR) and length-to-diameter (L/D) ratios, at subsonic and sonic flow regimes. It was found that the flow reattaches at approximately same location of the pipe, irrespective of the area ratio for the ca...

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Main Authors:	Sethuraman, Vigneshvaran, Khan, Sher Afghan
Format:	Article
Language:	English English
Published:	NOVA Science Publishers 2016
Subjects:	V Naval Science (General)
Online Access:	http://irep.iium.edu.my/53345/ http://irep.iium.edu.my/53345/ http://irep.iium.edu.my/53345/1/paper4.pdf http://irep.iium.edu.my/53345/7/53345_Effect%20of%20sudden%20expansion_SCOPUS.pdf

id	iium-53345
recordtype	eprints
spelling	iium-533452017-04-07T00:41:30Z http://irep.iium.edu.my/53345/ Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes Sethuraman, Vigneshvaran Khan, Sher Afghan V Naval Science (General) This study investigates the effect of sudden expansion of air in cylindrical pipes of varied area (AR) and length-to-diameter (L/D) ratios, at subsonic and sonic flow regimes. It was found that the flow reattaches at approximately same location of the pipe, irrespective of the area ratio for the cases 2.56 and 3.61. At minimal area ratio of 1.69, the flow possibly reattaches earlier than first pressure tapping point, due to smaller area for the flow to expand. The static pressure in the duct is nearly equal to free-stream pressure, at low subsonic Mach numbers. There is very minimal impact on the suction occurring at the base region. In the case of correctly expanded sonic and under-expanded sonic flow, the pressure is seen to rise very mildly above the atmospheric pressure and the suction at the base is set to decrease at that point. Post the reattachment point (R.A.P.), the pressure is gradually seen to stabilize and become equivalent to the atmospheric pressure earlier than the exit or at the exit of the pipe, causing an increased suction at the base region. Area ratio determines the size of recirculation zone and that determines the suction levels at the base. The suction occurring at the base becomes stronger as NPR increases, attributing to breaking down of larger vortices into smaller vortices. NOVA Science Publishers 2016 Article PeerReviewed application/pdf en http://irep.iium.edu.my/53345/1/paper4.pdf application/pdf en http://irep.iium.edu.my/53345/7/53345_Effect%20of%20sudden%20expansion_SCOPUS.pdf Sethuraman, Vigneshvaran and Khan, Sher Afghan (2016) Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes. International Journal of Energy, Environment, and Economics, 24 (1). pp. 99-111. ISSN 1054-853X http://www.novapublishers.com
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	V Naval Science (General)
spellingShingle	V Naval Science (General) Sethuraman, Vigneshvaran Khan, Sher Afghan Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
description	This study investigates the effect of sudden expansion of air in cylindrical pipes of varied area (AR) and length-to-diameter (L/D) ratios, at subsonic and sonic flow regimes. It was found that the flow reattaches at approximately same location of the pipe, irrespective of the area ratio for the cases 2.56 and 3.61. At minimal area ratio of 1.69, the flow possibly reattaches earlier than first pressure tapping point, due to smaller area for the flow to expand. The static pressure in the duct is nearly equal to free-stream pressure, at low subsonic Mach numbers. There is very minimal impact on the suction occurring at the base region. In the case of correctly expanded sonic and under-expanded sonic flow, the pressure is seen to rise very mildly above the atmospheric pressure and the suction at the base is set to decrease at that point. Post the reattachment point (R.A.P.), the pressure is gradually seen to stabilize and become equivalent to the atmospheric pressure earlier than the exit or at the exit of the pipe, causing an increased suction at the base region. Area ratio determines the size of recirculation zone and that determines the suction levels at the base. The suction occurring at the base becomes stronger as NPR increases, attributing to breaking down of larger vortices into smaller vortices.
format	Article
author	Sethuraman, Vigneshvaran Khan, Sher Afghan
author_facet	Sethuraman, Vigneshvaran Khan, Sher Afghan
author_sort	Sethuraman, Vigneshvaran
title	Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
title_short	Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
title_full	Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
title_fullStr	Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
title_full_unstemmed	Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
title_sort	effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes
publisher	NOVA Science Publishers
publishDate	2016
url	http://irep.iium.edu.my/53345/ http://irep.iium.edu.my/53345/ http://irep.iium.edu.my/53345/1/paper4.pdf http://irep.iium.edu.my/53345/7/53345_Effect%20of%20sudden%20expansion_SCOPUS.pdf
first_indexed	2023-09-18T21:15:30Z
last_indexed	2023-09-18T21:15:30Z
_version_	1777411534440366080

Effect of sudden expansion for varied area ratios at subsonic and sonic flow regimes

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