Effectiveness of micro-jets at different level of expansion

An experimental investigation was conducted to study the effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric duct. Since active control is used to control the base pressure and hence the base drag the air is drawn from the main settling chamber to the control cham...

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Main Authors:	Chaudhary, Zakir Ilahi, Vilas B., Shinde, Khan, Sher Afghan
Format:	Article
Language:	English
Published:	www.iosrjournals.org 2015
Subjects:	TL500 Aeronautics TL780 Rockets U Military Science (General)
Online Access:	http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/1/E012452934.pdf

id	iium-46631
recordtype	eprints
spelling	iium-466312017-11-16T09:35:34Z http://irep.iium.edu.my/46631/ Effectiveness of micro-jets at different level of expansion Chaudhary, Zakir Ilahi Vilas B., Shinde Khan, Sher Afghan TL500 Aeronautics TL780 Rockets U Military Science (General) An experimental investigation was conducted to study the effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric duct. Since active control is used to control the base pressure and hence the base drag the air is drawn from the main settling chamber to the control chamber to control the base pressure, hence it doesn’t require additional source of energy for the control mechanism. The flow parameters considered in this investigation are the Mach number (1.2, 1.3, 1.5, 1.9, 2.2, 2.6, and 3.0) at the exit of the nozzle, and the ratio of the pressure in the main settling chamber to the ambient pressure (NPR). The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area, and the duct length-to-diameter ratio (10 to 1). The area ratio considered was 3.24. The experiments were done for NPRs in the range from 3 to 11 in a step of 2 for all the Mach numbers. The wall pressure distribution in the suddenly expanded duct was also measured and it is seen from the static wall that the control does not affect the wall static pressure adversely. When the micro jets were activated they were found to influence the base region, taking the base pressure to considerably higher values compared to that for without control, for most of the cases. However, there are certain combinations of parameters for which the active control results in decrease of base pressure. www.iosrjournals.org 2015-07-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46631/1/E012452934.pdf Chaudhary, Zakir Ilahi and Vilas B., Shinde and Khan, Sher Afghan (2015) Effectiveness of micro-jets at different level of expansion. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE, 12 (4). pp. 29-34. ISSN 2278-3008 (O), 2319-7676 (P) http://www.iosrjournals.org/iosr-jmce/papers/vol12-issue4/Version-5/E012452934.pdf 10.9790/1684-12452934.
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL500 Aeronautics TL780 Rockets U Military Science (General)
spellingShingle	TL500 Aeronautics TL780 Rockets U Military Science (General) Chaudhary, Zakir Ilahi Vilas B., Shinde Khan, Sher Afghan Effectiveness of micro-jets at different level of expansion
description	An experimental investigation was conducted to study the effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric duct. Since active control is used to control the base pressure and hence the base drag the air is drawn from the main settling chamber to the control chamber to control the base pressure, hence it doesn’t require additional source of energy for the control mechanism. The flow parameters considered in this investigation are the Mach number (1.2, 1.3, 1.5, 1.9, 2.2, 2.6, and 3.0) at the exit of the nozzle, and the ratio of the pressure in the main settling chamber to the ambient pressure (NPR). The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area, and the duct length-to-diameter ratio (10 to 1). The area ratio considered was 3.24. The experiments were done for NPRs in the range from 3 to 11 in a step of 2 for all the Mach numbers. The wall pressure distribution in the suddenly expanded duct was also measured and it is seen from the static wall that the control does not affect the wall static pressure adversely. When the micro jets were activated they were found to influence the base region, taking the base pressure to considerably higher values compared to that for without control, for most of the cases. However, there are certain combinations of parameters for which the active control results in decrease of base pressure.
format	Article
author	Chaudhary, Zakir Ilahi Vilas B., Shinde Khan, Sher Afghan
author_facet	Chaudhary, Zakir Ilahi Vilas B., Shinde Khan, Sher Afghan
author_sort	Chaudhary, Zakir Ilahi
title	Effectiveness of micro-jets at different level of expansion
title_short	Effectiveness of micro-jets at different level of expansion
title_full	Effectiveness of micro-jets at different level of expansion
title_fullStr	Effectiveness of micro-jets at different level of expansion
title_full_unstemmed	Effectiveness of micro-jets at different level of expansion
title_sort	effectiveness of micro-jets at different level of expansion
publisher	www.iosrjournals.org
publishDate	2015
url	http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/ http://irep.iium.edu.my/46631/1/E012452934.pdf
first_indexed	2023-09-18T21:06:22Z
last_indexed	2023-09-18T21:06:22Z
_version_	1777410960516972544

Effectiveness of micro-jets at different level of expansion

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