Effect of mach number in a suddenly expanded flow for area ratio 4.84

The experiments were carried out to assess the effect of Mach number on base pressure and control effectiveness in a suddenly expanded duct. In the present study the Mach number at the nozzle exit and the nozzle pressure ratio (NPR) are the flow parameters considered. The area ratio (i.e. ratio betw...

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Main Authors:	Baig, Maugal Ahmed Ali, Khan, Sher Afghan, Rathakrishnan, E.
Format:	Article
Language:	English
Published:	IJERA 2012
Subjects:	TL Motor vehicles. Aeronautics. Astronautics TL500 Aeronautics
Online Access:	http://irep.iium.edu.my/49925/ http://irep.iium.edu.my/49925/ http://irep.iium.edu.my/49925/1/baig_m_a_-_2012_-_IJERA_1_Effect_of_Mach_number_In_a.pdf

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recordtype	eprints
spelling	iium-499252016-07-18T02:24:22Z http://irep.iium.edu.my/49925/ Effect of mach number in a suddenly expanded flow for area ratio 4.84 Baig, Maugal Ahmed Ali Khan, Sher Afghan Rathakrishnan, E. TL Motor vehicles. Aeronautics. Astronautics TL500 Aeronautics The experiments were carried out to assess the effect of Mach number on base pressure and control effectiveness in a suddenly expanded duct. In the present study the Mach number at the nozzle exit and the nozzle pressure ratio (NPR) are the flow parameters considered. The area ratio (i.e. ratio between cross sectional area of the sudden expansion duct and the nozzle exit area) and the length-to-diameter ratio of the duct are the geometrical parameters considered. The jet Mach numbers at the entry to the suddenly expanded duct, studied are 1.87, 2.2 and 2.58. The nozzle pressure ratio (NPR) used is from 3 to 11, in steps of 2 and experiments are conducted for NPR 3, 5, 7, 9, and 11 for all the Mach numbers. The area ratio of the present study is 4.84. The L/D ratio of the duct is varied from 10 to 1. Active control in the form of four micro jets of 1mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region are employed. In addition to base pressure, wall pressure field along the duct is also studied. From the present studies it is found that for the given area ratio the base pressure increase with Mach number. When the flow is over expanded the base pressure assumes very high value due the presence of oblique shock at the nozzle lip. It is also found from wall pressure studies that the micro jets do not disturb the flow field in the enlarged duct. IJERA 2012-07 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49925/1/baig_m_a_-_2012_-_IJERA_1_Effect_of_Mach_number_In_a.pdf Baig, Maugal Ahmed Ali and Khan, Sher Afghan and Rathakrishnan, E. (2012) Effect of mach number in a suddenly expanded flow for area ratio 4.84. International Journal of Engineering Research and Application, 2 (4). pp. 593-599. ISSN 2248-9622 http://www.ijera.com
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL Motor vehicles. Aeronautics. Astronautics TL500 Aeronautics
spellingShingle	TL Motor vehicles. Aeronautics. Astronautics TL500 Aeronautics Baig, Maugal Ahmed Ali Khan, Sher Afghan Rathakrishnan, E. Effect of mach number in a suddenly expanded flow for area ratio 4.84
description	The experiments were carried out to assess the effect of Mach number on base pressure and control effectiveness in a suddenly expanded duct. In the present study the Mach number at the nozzle exit and the nozzle pressure ratio (NPR) are the flow parameters considered. The area ratio (i.e. ratio between cross sectional area of the sudden expansion duct and the nozzle exit area) and the length-to-diameter ratio of the duct are the geometrical parameters considered. The jet Mach numbers at the entry to the suddenly expanded duct, studied are 1.87, 2.2 and 2.58. The nozzle pressure ratio (NPR) used is from 3 to 11, in steps of 2 and experiments are conducted for NPR 3, 5, 7, 9, and 11 for all the Mach numbers. The area ratio of the present study is 4.84. The L/D ratio of the duct is varied from 10 to 1. Active control in the form of four micro jets of 1mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region are employed. In addition to base pressure, wall pressure field along the duct is also studied. From the present studies it is found that for the given area ratio the base pressure increase with Mach number. When the flow is over expanded the base pressure assumes very high value due the presence of oblique shock at the nozzle lip. It is also found from wall pressure studies that the micro jets do not disturb the flow field in the enlarged duct.
format	Article
author	Baig, Maugal Ahmed Ali Khan, Sher Afghan Rathakrishnan, E.
author_facet	Baig, Maugal Ahmed Ali Khan, Sher Afghan Rathakrishnan, E.
author_sort	Baig, Maugal Ahmed Ali
title	Effect of mach number in a suddenly expanded flow for area ratio 4.84
title_short	Effect of mach number in a suddenly expanded flow for area ratio 4.84
title_full	Effect of mach number in a suddenly expanded flow for area ratio 4.84
title_fullStr	Effect of mach number in a suddenly expanded flow for area ratio 4.84
title_full_unstemmed	Effect of mach number in a suddenly expanded flow for area ratio 4.84
title_sort	effect of mach number in a suddenly expanded flow for area ratio 4.84
publisher	IJERA
publishDate	2012
url	http://irep.iium.edu.my/49925/ http://irep.iium.edu.my/49925/ http://irep.iium.edu.my/49925/1/baig_m_a_-_2012_-_IJERA_1_Effect_of_Mach_number_In_a.pdf
first_indexed	2023-09-18T21:10:32Z
last_indexed	2023-09-18T21:10:32Z
_version_	1777411222685089792

Effect of mach number in a suddenly expanded flow for area ratio 4.84

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