Active control of base pressure in suddenly expanded flow for area ratio 4.84

Airflow from convergent-divergent axi-symmetric nozzles expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area are studied experimentally, focusing attention on the base pressure and the flow development in the enlarged duct. Micro-jets of 1 mm orifice di...

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Main Authors:	Ali Baig, Maughal Ahmed, Khan, Sher Afghan, Rathakrishnan, Ethirajan
Format:	Article
Language:	English
Published:	International Journal of Engineering Science and Technology" (IJEST™) 2012
Subjects:	TL780 Rockets
Online Access:	http://irep.iium.edu.my/49825/ http://irep.iium.edu.my/49825/ http://irep.iium.edu.my/49825/1/IJEST12-04-05-149.pdf

id	iium-49825
recordtype	eprints
spelling	iium-498252016-07-18T02:53:55Z http://irep.iium.edu.my/49825/ Active control of base pressure in suddenly expanded flow for area ratio 4.84 Ali Baig, Maughal Ahmed Khan, Sher Afghan Rathakrishnan, Ethirajan TL780 Rockets Airflow from convergent-divergent axi-symmetric nozzles expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area are studied experimentally, focusing attention on the base pressure and the flow development in the enlarged duct. Micro-jets of 1 mm orifice diameter located at 900 intervals along a pitch circle diameter (pcd) 1.3 times the nozzle exit diameter were employed as the controller of the base pressure. The tests are conducted for Mach numbers 1.87, 2.2 and 2.58. The area ratio of the present study is 4.84. The length-to-diameter ratio of the suddenly expanded duct is varied from 10 to 1 and nozzle pressure ratio (NPR) in the range 3 to 11. It is found that the active control in the form of blowing through small orifices (micro jets) are effective in controlling the base pressure field and even do not augment the flow field in the duct. An increase of 45 percent in base pressure was achieved for certain combination of parameters of the present study. International Journal of Engineering Science and Technology" (IJEST™) 2012-05 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49825/1/IJEST12-04-05-149.pdf Ali Baig, Maughal Ahmed and Khan, Sher Afghan and Rathakrishnan, Ethirajan (2012) Active control of base pressure in suddenly expanded flow for area ratio 4.84. International Journal of Engineering Science and Technology (IJEST), 4 (5). pp. 1885-1895. ISSN 2278-9510 E-ISSN 0975-5462 http://www.ijest.info/abstract.php?file=12-04-05-149
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL780 Rockets
spellingShingle	TL780 Rockets Ali Baig, Maughal Ahmed Khan, Sher Afghan Rathakrishnan, Ethirajan Active control of base pressure in suddenly expanded flow for area ratio 4.84
description	Airflow from convergent-divergent axi-symmetric nozzles expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area are studied experimentally, focusing attention on the base pressure and the flow development in the enlarged duct. Micro-jets of 1 mm orifice diameter located at 900 intervals along a pitch circle diameter (pcd) 1.3 times the nozzle exit diameter were employed as the controller of the base pressure. The tests are conducted for Mach numbers 1.87, 2.2 and 2.58. The area ratio of the present study is 4.84. The length-to-diameter ratio of the suddenly expanded duct is varied from 10 to 1 and nozzle pressure ratio (NPR) in the range 3 to 11. It is found that the active control in the form of blowing through small orifices (micro jets) are effective in controlling the base pressure field and even do not augment the flow field in the duct. An increase of 45 percent in base pressure was achieved for certain combination of parameters of the present study.
format	Article
author	Ali Baig, Maughal Ahmed Khan, Sher Afghan Rathakrishnan, Ethirajan
author_facet	Ali Baig, Maughal Ahmed Khan, Sher Afghan Rathakrishnan, Ethirajan
author_sort	Ali Baig, Maughal Ahmed
title	Active control of base pressure in suddenly expanded flow for area ratio 4.84
title_short	Active control of base pressure in suddenly expanded flow for area ratio 4.84
title_full	Active control of base pressure in suddenly expanded flow for area ratio 4.84
title_fullStr	Active control of base pressure in suddenly expanded flow for area ratio 4.84
title_full_unstemmed	Active control of base pressure in suddenly expanded flow for area ratio 4.84
title_sort	active control of base pressure in suddenly expanded flow for area ratio 4.84
publisher	International Journal of Engineering Science and Technology" (IJEST™)
publishDate	2012
url	http://irep.iium.edu.my/49825/ http://irep.iium.edu.my/49825/ http://irep.iium.edu.my/49825/1/IJEST12-04-05-149.pdf
first_indexed	2023-09-18T21:10:23Z
last_indexed	2023-09-18T21:10:23Z
_version_	1777411213087473664

Active control of base pressure in suddenly expanded flow for area ratio 4.84

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