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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/53345/1/paper4.pdf
http://irep.iium.edu.my/53345/7/53345_Effect%20of%20sudden%20expansion_SCOPUS.pdf
http://irep.iium.edu.my/53345/
http://www.novapublishers.com
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spelling my.iium.irep.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 REM 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
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
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/53345/1/paper4.pdf
http://irep.iium.edu.my/53345/7/53345_Effect%20of%20sudden%20expansion_SCOPUS.pdf
http://irep.iium.edu.my/53345/
http://www.novapublishers.com
_version_ 1643614335104188416
score 13.211869

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