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Sonic Under Expanded Flow Control With Micro Jets

This paper presents the results of experimental studies to control the base pressure from a convergent nozzle under the influence of favorable pressures gradient at sonic Mach number. An active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals along a pitch cir...

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Main Authors: Syed, Syed Ashfaq, Khan, Sher Afghan
Format: Article
Language:English
Published: IJERA 2013
Subjects:
TJ170 Mechanics applied to machinery. Dynamics
TL1 Motor vehicles
Online Access:http://irep.iium.edu.my/49896/1/2013_NOV_DEC_IJERA.pdf
http://irep.iium.edu.my/49896/
http://www.ijera.com
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spelling my.iium.irep.498962016-07-18T02:22:46Z http://irep.iium.edu.my/49896/ Sonic Under Expanded Flow Control With Micro Jets Syed, Syed Ashfaq Khan, Sher Afghan TJ170 Mechanics applied to machinery. Dynamics TL1 Motor vehicles This paper presents the results of experimental studies to control the base pressure from a convergent nozzle under the influence of favorable pressures gradient at sonic Mach number. 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 to control the base pressure. The area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied are 2.56, 3.24, 4.84 and 6.25. The L/D ratio of the sudden expansion duct varies from 10 to 1. From the results, an important aspect to be noted here is that, unlike passive controls the favorable pressure gradient does not ensure augmentation of the control effectiveness for active control in the form of micro jets. To study the effect of micro jets on the quality of flow in the enlarged duct wall pressure was measured and it is found that the micro jets do not disturb the flow field in the duct rather the quality of flow has improved due to the presence of micro jets in some cases. IJERA 2013-11 Article REM application/pdf en http://irep.iium.edu.my/49896/1/2013_NOV_DEC_IJERA.pdf Syed, Syed Ashfaq and Khan, Sher Afghan (2013) Sonic Under Expanded Flow Control With Micro Jets. International Journal of Engineering Research and Application, 3 (6). pp. 1482-1488. ISSN 2248-9622 http://www.ijera.com
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 TJ170 Mechanics applied to machinery. Dynamics
TL1 Motor vehicles
spellingShingle TJ170 Mechanics applied to machinery. Dynamics
TL1 Motor vehicles
Syed, Syed Ashfaq
Khan, Sher Afghan
Sonic Under Expanded Flow Control With Micro Jets
description This paper presents the results of experimental studies to control the base pressure from a convergent nozzle under the influence of favorable pressures gradient at sonic Mach number. 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 to control the base pressure. The area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied are 2.56, 3.24, 4.84 and 6.25. The L/D ratio of the sudden expansion duct varies from 10 to 1. From the results, an important aspect to be noted here is that, unlike passive controls the favorable pressure gradient does not ensure augmentation of the control effectiveness for active control in the form of micro jets. To study the effect of micro jets on the quality of flow in the enlarged duct wall pressure was measured and it is found that the micro jets do not disturb the flow field in the duct rather the quality of flow has improved due to the presence of micro jets in some cases.
format Article
author Syed, Syed Ashfaq
Khan, Sher Afghan
author_facet Syed, Syed Ashfaq
Khan, Sher Afghan
author_sort Syed, Syed Ashfaq
title Sonic Under Expanded Flow Control With Micro Jets
title_short Sonic Under Expanded Flow Control With Micro Jets
title_full Sonic Under Expanded Flow Control With Micro Jets
title_fullStr Sonic Under Expanded Flow Control With Micro Jets
title_full_unstemmed Sonic Under Expanded Flow Control With Micro Jets
title_sort sonic under expanded flow control with micro jets
publisher IJERA
publishDate 2013
url http://irep.iium.edu.my/49896/1/2013_NOV_DEC_IJERA.pdf
http://irep.iium.edu.my/49896/
http://www.ijera.com
_version_ 1643613618787319808
score 13.211869

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