Active control of suddenly expanded flows from overexpanded nozzles

An experimental investigation was carried out to study the effectiveness of micro-jets to control base pressure in suddenly expanded axi-symmetric ducts. Four micro-jets of 1 mm orifice diameter located at 90$^\circ$ interval along a pitch circle diameter of 1.3 times the nozzle exit diameter...

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Main Authors:	Khan, Sher, Rathakrishnan, E.
Format:	Article
Language:	English
Published:	Walter de Gruyter 2002
Subjects:	TL Motor vehicles. Aeronautics. Astronautics
Online Access:	http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/1/khan_s_a_-_2002_-_active_control_of_suddenly_expanded_flows_from_overexpanded_nozzles.pdf

id	iium-46690
recordtype	eprints
spelling	iium-466902016-07-14T23:48:00Z http://irep.iium.edu.my/46690/ Active control of suddenly expanded flows from overexpanded nozzles Khan, Sher Rathakrishnan, E. TL Motor vehicles. Aeronautics. Astronautics An experimental investigation was carried out to study the effectiveness of micro-jets to control base pressure in suddenly expanded axi-symmetric ducts. Four micro-jets of 1 mm orifice diameter located at 90$^\circ$ interval along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed as active controls. The Mach numbers of the suddenly expanded flows were studies 2.0, 2.5 and 3.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 2.56, 3.24, 4.84, and 6.25 times that of nozzle exit diameter. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. The jets were operated at an over expansion level of Pe/Pa = 0.277. The wall pressure distribution in the suddenly enlarged duct was also measured. It is found that the micro-jets can serve as active controllers for base pressure. Also, the wall pressure distribution is not adversely influenced by the micro-jets. From the present investigation it is evident that for a given Mach number and nozzle pressure ratio one can identify the enlargement length to diameter ratio which will result in maximum increase/decrease of base pressure. Walter de Gruyter 2002 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46690/1/khan_s_a_-_2002_-_active_control_of_suddenly_expanded_flows_from_overexpanded_nozzles.pdf Khan, Sher and Rathakrishnan, E. (2002) Active control of suddenly expanded flows from overexpanded nozzles. International Journal of Turbo & Jet-Engines, 19 (1-2). pp. 119-126. ISSN 0334-0082 E-ISSN 2191-0332 http://www.degruyter.com/view/j/tjj.2002.19.1-2/tjj.2002.19.1-2.119/tjj.2002.19.1-2.119.xml 10.1515/TJJ.2002.19.1-2.119
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL Motor vehicles. Aeronautics. Astronautics
spellingShingle	TL Motor vehicles. Aeronautics. Astronautics Khan, Sher Rathakrishnan, E. Active control of suddenly expanded flows from overexpanded nozzles
description	An experimental investigation was carried out to study the effectiveness of micro-jets to control base pressure in suddenly expanded axi-symmetric ducts. Four micro-jets of 1 mm orifice diameter located at 90$^\circ$ interval along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed as active controls. The Mach numbers of the suddenly expanded flows were studies 2.0, 2.5 and 3.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 2.56, 3.24, 4.84, and 6.25 times that of nozzle exit diameter. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. The jets were operated at an over expansion level of Pe/Pa = 0.277. The wall pressure distribution in the suddenly enlarged duct was also measured. It is found that the micro-jets can serve as active controllers for base pressure. Also, the wall pressure distribution is not adversely influenced by the micro-jets. From the present investigation it is evident that for a given Mach number and nozzle pressure ratio one can identify the enlargement length to diameter ratio which will result in maximum increase/decrease of base pressure.
format	Article
author	Khan, Sher Rathakrishnan, E.
author_facet	Khan, Sher Rathakrishnan, E.
author_sort	Khan, Sher
title	Active control of suddenly expanded flows from overexpanded nozzles
title_short	Active control of suddenly expanded flows from overexpanded nozzles
title_full	Active control of suddenly expanded flows from overexpanded nozzles
title_fullStr	Active control of suddenly expanded flows from overexpanded nozzles
title_full_unstemmed	Active control of suddenly expanded flows from overexpanded nozzles
title_sort	active control of suddenly expanded flows from overexpanded nozzles
publisher	Walter de Gruyter
publishDate	2002
url	http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/ http://irep.iium.edu.my/46690/1/khan_s_a_-_2002_-_active_control_of_suddenly_expanded_flows_from_overexpanded_nozzles.pdf
first_indexed	2023-09-18T21:06:27Z
last_indexed	2023-09-18T21:06:27Z
_version_	1777410965882535936

Active control of suddenly expanded flows from overexpanded nozzles

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