An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle

This paper presents the results of an experimental investigation conducted at supersonic Mach number of 1.25 through a converging–diverging nozzle for diameter-ratio of 1.6. The experiments were conducted at different level of expansion viz. for correctly expanded and under expanded cases and, for...

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Main Authors:	Khan, Sher Afghan, Bashir, Musavir, G M, Fharukh Ahmed, Ullah, M. Asad
Format:	Article
Language:	English
Published:	UNIV LAGOS 2016
Subjects:	TL787 Astronautics
Online Access:	http://irep.iium.edu.my/51373/ http://irep.iium.edu.my/51373/ http://irep.iium.edu.my/51373/1/our_paper.pdf

id	iium-51373
recordtype	eprints
spelling	iium-513732017-04-28T07:48:30Z http://irep.iium.edu.my/51373/ An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle Khan, Sher Afghan Bashir, Musavir G M, Fharukh Ahmed Ullah, M. Asad TL787 Astronautics This paper presents the results of an experimental investigation conducted at supersonic Mach number of 1.25 through a converging–diverging nozzle for diameter-ratio of 1.6. The experiments were conducted at different level of expansion viz. for correctly expanded and under expanded cases and, for length-to-diameter ratio of 10 to 1. From the results it is found that the flow remains attached with the suddenly expanded duct even for L/D = 1 for both with and without control cases. For some combination of the NPR and L/D ratio the flow field in the duct becomes oscillatory which; indicates that the flow in the duct is dominated by the waves however, it remained same even when the control in the form of micro jets are activated. Hence, the control does influence the flow in the duct wall. It is also seen that when the jets are under expanded the control becomes effective; however, with further increase in the level of under expansion they do not give the desired result. Hence, there seems to be a limiting value of level of expansion which will give desired result and at Mach 1.25, this value is Pe/Pa = 1.5. UNIV LAGOS 2016-07 Article PeerReviewed application/pdf en http://irep.iium.edu.my/51373/1/our_paper.pdf Khan, Sher Afghan and Bashir, Musavir and G M, Fharukh Ahmed and Ullah, M. Asad (2016) An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle. Journal of Scientific Research and Development, 3 (5). pp. 1-6. ISSN 1115-7569 http://jsrad.org/wp-content/2016/Issue%205,%202016/1j.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL787 Astronautics
spellingShingle	TL787 Astronautics Khan, Sher Afghan Bashir, Musavir G M, Fharukh Ahmed Ullah, M. Asad An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
description	This paper presents the results of an experimental investigation conducted at supersonic Mach number of 1.25 through a converging–diverging nozzle for diameter-ratio of 1.6. The experiments were conducted at different level of expansion viz. for correctly expanded and under expanded cases and, for length-to-diameter ratio of 10 to 1. From the results it is found that the flow remains attached with the suddenly expanded duct even for L/D = 1 for both with and without control cases. For some combination of the NPR and L/D ratio the flow field in the duct becomes oscillatory which; indicates that the flow in the duct is dominated by the waves however, it remained same even when the control in the form of micro jets are activated. Hence, the control does influence the flow in the duct wall. It is also seen that when the jets are under expanded the control becomes effective; however, with further increase in the level of under expansion they do not give the desired result. Hence, there seems to be a limiting value of level of expansion which will give desired result and at Mach 1.25, this value is Pe/Pa = 1.5.
format	Article
author	Khan, Sher Afghan Bashir, Musavir G M, Fharukh Ahmed Ullah, M. Asad
author_facet	Khan, Sher Afghan Bashir, Musavir G M, Fharukh Ahmed Ullah, M. Asad
author_sort	Khan, Sher Afghan
title	An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
title_short	An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
title_full	An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
title_fullStr	An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
title_full_unstemmed	An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
title_sort	investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle
publisher	UNIV LAGOS
publishDate	2016
url	http://irep.iium.edu.my/51373/ http://irep.iium.edu.my/51373/ http://irep.iium.edu.my/51373/1/our_paper.pdf
first_indexed	2023-09-18T21:12:43Z
last_indexed	2023-09-18T21:12:43Z
_version_	1777411360059031552

An investigation of base flow control by wall pressure analysis in a suddenly expansion nozzle

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