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
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Online Access:http://irep.iium.edu.my/46690/1/khan_s_a_-_2002_-_active_control_of_suddenly_expanded_flows_from_overexpanded_nozzles.pdf
http://irep.iium.edu.my/46690/
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spelling my.iium.irep.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 REM 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 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
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
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/46690/1/khan_s_a_-_2002_-_active_control_of_suddenly_expanded_flows_from_overexpanded_nozzles.pdf
http://irep.iium.edu.my/46690/
http://www.degruyter.com/view/j/tjj.2002.19.1-2/tjj.2002.19.1-2.119/tjj.2002.19.1-2.119.xml
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score 13.209306