Active control of suddenly expanded flow from under expanded nozzles

Active control of suddenly expanded flow from under expanded nozzles

This paper presents an experimental investigation 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 900 interval along a pitch circle diameter of 1.3 times the nozzle exit diameter in the ba...

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Main Authors: Khan, Sher Afghan, Rathakrishnan, E.
Format: Article
Language:English
Published: Walter de Gruyter 2004
Subjects:
TL500 Aeronautics
Online Access:http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/1/khan_s_a_-_2004_-_active_control_underexpanded.pdf
id iium-46705
recordtype eprints
spelling iium-467052016-07-14T23:56:22Z http://irep.iium.edu.my/46705/ Active control of suddenly expanded flow from under expanded nozzles Khan, Sher Afghan Rathakrishnan, E. TL500 Aeronautics This paper presents an experimental investigation 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 900 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 1.25, 1.3, 1.48, 1.6, 1.8, and 2.0. 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 at all Mach number were operated at an under expansion level of Pe/Pa = 1.5. 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 2004-12 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46705/1/khan_s_a_-_2004_-_active_control_underexpanded.pdf Khan, Sher Afghan and Rathakrishnan, E. (2004) Active control of suddenly expanded flow from under expanded nozzles. International Journal of Turbo & Jet-Engines, 21 (4). pp. 233-253. ISSN 0334-0082 E-ISSN 2191-0332 http://www.degruyter.com/view/j/tjj.2004.21.4/tjj.2004.21.4.233/tjj.2004.21.4.233.xml?format=INT 10.1515/TJJ.2004.21.4.233.
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
Khan, Sher Afghan
Rathakrishnan, E.
Active control of suddenly expanded flow from under expanded nozzles
description This paper presents an experimental investigation 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 900 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 1.25, 1.3, 1.48, 1.6, 1.8, and 2.0. 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 at all Mach number were operated at an under expansion level of Pe/Pa = 1.5. 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 Afghan
Rathakrishnan, E.
author_facet Khan, Sher Afghan
Rathakrishnan, E.
author_sort Khan, Sher Afghan
title Active control of suddenly expanded flow from under expanded nozzles
title_short Active control of suddenly expanded flow from under expanded nozzles
title_full Active control of suddenly expanded flow from under expanded nozzles
title_fullStr Active control of suddenly expanded flow from under expanded nozzles
title_full_unstemmed Active control of suddenly expanded flow from under expanded nozzles
title_sort active control of suddenly expanded flow from under expanded nozzles
publisher Walter de Gruyter
publishDate 2004
url http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/
http://irep.iium.edu.my/46705/1/khan_s_a_-_2004_-_active_control_underexpanded.pdf
first_indexed 2023-09-18T21:06:29Z
last_indexed 2023-09-18T21:06:29Z
_version_ 1777410967189061632

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