Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers

In the current investigation, the experiments were carried out to evaluate the effectiveness of microjets in controlling the base pressure from a convergentdivergent nozzle at low supersonic Mach at different expansion level. Tests were carried out for low supersonic Mach numbers 1.25, 1.3, 1.48, an...

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Main Authors:	Chaudhary, Zakir Ilahi, Shinde, Vilas B., Bashir, Musavir, Khan, Sher Afghan
Format:	Article
Language:	English English
Published:	Springer Science + Business Media 2017
Subjects:	T Technology (General) TA Engineering (General). Civil engineering (General)
Online Access:	http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/1/62899_Experimental%20investigation%20on%20the%20effectiveness_article.pdf http://irep.iium.edu.my/62899/2/62899_Experimental%20investigation%20on%20the%20effectiveness_scopus.pdf

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spelling	iium-628992018-03-21T07:25:54Z http://irep.iium.edu.my/62899/ Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers Chaudhary, Zakir Ilahi Shinde, Vilas B. Bashir, Musavir Khan, Sher Afghan T Technology (General) TA Engineering (General). Civil engineering (General) In the current investigation, the experiments were carried out to evaluate the effectiveness of microjets in controlling the base pressure from a convergentdivergent nozzle at low supersonic Mach at different expansion level. Tests were carried out for low supersonic Mach numbers 1.25, 1.3, 1.48, and 1.6 while nozzle pressure ratio ranges from 3 to 11. The jets are augmented abruptly into an axisymmetric circular channel with different cross-sectional areas as that of nozzle exit area. The results show that the proficiency of the microjets is only marginal in controlling the base pressure even under the influence of favorable pressure gradient at lower NPRs namely 3 and 5. It was also observed that for higher values of the NPRs such as 7, 9, and 11, the dynamic control by very small jets results in rise of base pressure for the different values of the L/D ratios of these investigations. For NPRs 5 and 7, the trend differs due to the level of expansion, nature of waves present in the base region, relief available to the flow, length to diameter ratio of the enlarged duct, and the Mach numbers. It is seen that most of the cases exhibit similar behavior for higher as well as the lower length to diameter ratios, which means; that the back pressure has not adversely influenced the flow field in the base region as well as in the duct. With this it can be stated that the microjets can be an alternative for the experimentalist for base pressure control in the form of microjets. Springer Science + Business Media 2017 Article PeerReviewed application/pdf en http://irep.iium.edu.my/62899/1/62899_Experimental%20investigation%20on%20the%20effectiveness_article.pdf application/pdf en http://irep.iium.edu.my/62899/2/62899_Experimental%20investigation%20on%20the%20effectiveness_scopus.pdf Chaudhary, Zakir Ilahi and Shinde, Vilas B. and Bashir, Musavir and Khan, Sher Afghan (2017) Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers. Lecture Notes in Mechanical Engineering, PartF9. pp. 197-209. ISSN 2195-4356 E-ISSN 2195-4364 (In Press) https://link.springer.com/chapter/10.1007%2F978-981-10-1771-1_24 10.1007/978-981-10-1771-1_24
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	T Technology (General) TA Engineering (General). Civil engineering (General)
spellingShingle	T Technology (General) TA Engineering (General). Civil engineering (General) Chaudhary, Zakir Ilahi Shinde, Vilas B. Bashir, Musavir Khan, Sher Afghan Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
description	In the current investigation, the experiments were carried out to evaluate the effectiveness of microjets in controlling the base pressure from a convergentdivergent nozzle at low supersonic Mach at different expansion level. Tests were carried out for low supersonic Mach numbers 1.25, 1.3, 1.48, and 1.6 while nozzle pressure ratio ranges from 3 to 11. The jets are augmented abruptly into an axisymmetric circular channel with different cross-sectional areas as that of nozzle exit area. The results show that the proficiency of the microjets is only marginal in controlling the base pressure even under the influence of favorable pressure gradient at lower NPRs namely 3 and 5. It was also observed that for higher values of the NPRs such as 7, 9, and 11, the dynamic control by very small jets results in rise of base pressure for the different values of the L/D ratios of these investigations. For NPRs 5 and 7, the trend differs due to the level of expansion, nature of waves present in the base region, relief available to the flow, length to diameter ratio of the enlarged duct, and the Mach numbers. It is seen that most of the cases exhibit similar behavior for higher as well as the lower length to diameter ratios, which means; that the back pressure has not adversely influenced the flow field in the base region as well as in the duct. With this it can be stated that the microjets can be an alternative for the experimentalist for base pressure control in the form of microjets.
format	Article
author	Chaudhary, Zakir Ilahi Shinde, Vilas B. Bashir, Musavir Khan, Sher Afghan
author_facet	Chaudhary, Zakir Ilahi Shinde, Vilas B. Bashir, Musavir Khan, Sher Afghan
author_sort	Chaudhary, Zakir Ilahi
title	Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
title_short	Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
title_full	Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
title_fullStr	Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
title_full_unstemmed	Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
title_sort	experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers
publisher	Springer Science + Business Media
publishDate	2017
url	http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/ http://irep.iium.edu.my/62899/1/62899_Experimental%20investigation%20on%20the%20effectiveness_article.pdf http://irep.iium.edu.my/62899/2/62899_Experimental%20investigation%20on%20the%20effectiveness_scopus.pdf
first_indexed	2023-09-18T21:29:07Z
last_indexed	2023-09-18T21:29:07Z
_version_	1777412392084307968

Experimental investigation on the effectiveness of active control mechanism on base pressure at low supersonic mach numbers

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