Studies on wall pressure flow control by micro jets for high area ratio

This paper discuss the experimental results on the flow characteristics of a suddenly expanded flow from the convergent nozzle for subsonic Mach numbers. An Active control in the form of micro jets were used to investigate the effectiveness of micro jets on wall pressure flow field in the enlarged d...

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Main Authors:	Ashfaq, Syed, Khan, Sher Afghan
Format:	Article
Language:	English
Published:	RS Publication 2014
Subjects:	TL500 Aeronautics
Online Access:	http://irep.iium.edu.my/49912/ http://irep.iium.edu.my/49912/ http://irep.iium.edu.my/49912/1/2014_JAN_FEB_IJESAT_664.pdf

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recordtype	eprints
spelling	iium-499122018-06-20T08:33:46Z http://irep.iium.edu.my/49912/ Studies on wall pressure flow control by micro jets for high area ratio Ashfaq, Syed Khan, Sher Afghan TL500 Aeronautics This paper discuss the experimental results on the flow characteristics of a suddenly expanded flow from the convergent nozzle for subsonic Mach numbers. An Active control in the form of micro jets were used to investigate the effectiveness of micro jets on wall pressure flow field in the enlarged duct. Accordingly an active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed. The Mach numbers of the present studies were M = 0.9, 0.8, and 0.6 and the area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied was 6.25. The length-to-diameter (i.e. L/D) ratio of the sudden expansion duct was varied from 10 to 1. From the results, it is seen that the flow in the base region is dominated by the waves, however, the magnitude of the waves has reduced considerably due to the very high area ratio, also, it is found that for L/D in the range L/D = 10 and 8 the flow remains oscillatory for all the Mach numbers. However, these oscillations are suppressed gradually either with the decrease in the L/D ratio in the range 3 to 6 or with decrease in the level of inertia level. The minimum suddenly expanded duct length required for the flow to be attached is the present study has shown that the wall pressure in a suddenly expanded axi-symmetric duct can be controlled by employing micro jets at the base. It is found that the flow field in the enlarged duct with and without control remained the same hence, we summarized that active control in the form of micro jets are not disturbing the field. RS Publication 2014-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49912/1/2014_JAN_FEB_IJESAT_664.pdf Ashfaq, Syed and Khan, Sher Afghan (2014) Studies on wall pressure flow control by micro jets for high area ratio. International Journal of Advanced Scientific and Technical Research, 4 (1). pp. 664-672. ISSN 2249-9954 http://rspublication.com/ijst/2014/feb14/58.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL500 Aeronautics
spellingShingle	TL500 Aeronautics Ashfaq, Syed Khan, Sher Afghan Studies on wall pressure flow control by micro jets for high area ratio
description	This paper discuss the experimental results on the flow characteristics of a suddenly expanded flow from the convergent nozzle for subsonic Mach numbers. An Active control in the form of micro jets were used to investigate the effectiveness of micro jets on wall pressure flow field in the enlarged duct. Accordingly an active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed. The Mach numbers of the present studies were M = 0.9, 0.8, and 0.6 and the area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied was 6.25. The length-to-diameter (i.e. L/D) ratio of the sudden expansion duct was varied from 10 to 1. From the results, it is seen that the flow in the base region is dominated by the waves, however, the magnitude of the waves has reduced considerably due to the very high area ratio, also, it is found that for L/D in the range L/D = 10 and 8 the flow remains oscillatory for all the Mach numbers. However, these oscillations are suppressed gradually either with the decrease in the L/D ratio in the range 3 to 6 or with decrease in the level of inertia level. The minimum suddenly expanded duct length required for the flow to be attached is the present study has shown that the wall pressure in a suddenly expanded axi-symmetric duct can be controlled by employing micro jets at the base. It is found that the flow field in the enlarged duct with and without control remained the same hence, we summarized that active control in the form of micro jets are not disturbing the field.
format	Article
author	Ashfaq, Syed Khan, Sher Afghan
author_facet	Ashfaq, Syed Khan, Sher Afghan
author_sort	Ashfaq, Syed
title	Studies on wall pressure flow control by micro jets for high area ratio
title_short	Studies on wall pressure flow control by micro jets for high area ratio
title_full	Studies on wall pressure flow control by micro jets for high area ratio
title_fullStr	Studies on wall pressure flow control by micro jets for high area ratio
title_full_unstemmed	Studies on wall pressure flow control by micro jets for high area ratio
title_sort	studies on wall pressure flow control by micro jets for high area ratio
publisher	RS Publication
publishDate	2014
url	http://irep.iium.edu.my/49912/ http://irep.iium.edu.my/49912/ http://irep.iium.edu.my/49912/1/2014_JAN_FEB_IJESAT_664.pdf
first_indexed	2023-09-18T21:10:31Z
last_indexed	2023-09-18T21:10:31Z
_version_	1777411221069234176

Studies on wall pressure flow control by micro jets for high area ratio

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