Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25

Micro jets are used in the present experimental study as an active control. Flow from converging nozzle to suddenly expanded circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the base pressure and the flow development in the...

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Main Authors:	Ashfaq, Syed, Khan, Sher Afghan
Format:	Article
Language:	English
Published:	International Journal of Engineering Science & Advanced Technology 2014
Subjects:	TL780 Rockets
Online Access:	http://irep.iium.edu.my/49906/ http://irep.iium.edu.my/49906/ http://irep.iium.edu.my/49906/1/2014_JAN_FEB_IJESAT.pdf

id	iium-49906
recordtype	eprints
spelling	iium-499062018-06-20T08:37:48Z http://irep.iium.edu.my/49906/ Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25 Ashfaq, Syed Khan, Sher Afghan TL780 Rockets Micro jets are used in the present experimental study as an active control. Flow from converging nozzle to suddenly expanded circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the base pressure and the flow development in the duct. Mach number and nozzle pressure ratio are considered as the flow parameters. The geometrical parameters considered are the area ratio of the sudden expansion duct cross-section area to the nozzle exit area and the length to diameter ratio of the duct. To find the effect of micro jets as an active control on base pressure as well as on the flow field developed in the duct, the micro jets of 1 mm orifice diameter are used. They are located at 900 intervals along a pitch circle diameter 1.3 times the nozzle exit diameter. In this study, the area ratio considered is 6.25. The flow parameter, nozzle pressure ratio (NPR) used were from 1.5 to 3, in steps of 0.5 and experiments were conducted for NPR 1.5, 2.0, 2.5 and 3.0. The geometrical parameter, the length to diameter ratio of the enlarged duct was varied from 10 to 1, and tests were conducted for L/D 10, 8, 6, 5, 4, 3, 2 and 1. When the micro jets were activated they are found to influence the base region, taking the base suction to considerably higher values compared to that for without control case for most of the cases. From the present study it is found that as the NPR increases, the effect on base pressure is marginal for NPRs up to 2.5; however, at NPR 3 there is a sudden decrease in the base pressure. Further, it is found that the micro jets are very effective in controlling the base pressure and the active control in the form of micro jets does not disturb the flow field in the duct, however, wall pressure becomes oscillatory at NPR 3. International Journal of Engineering Science & Advanced Technology 2014-01 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49906/1/2014_JAN_FEB_IJESAT.pdf Ashfaq, Syed and Khan, Sher Afghan (2014) Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25. International Journal of Engineering Science & Advanced Technology, 4 (1). pp. 49-60. ISSN 2250-3676 http://ijesat.org/Volumes/2014_Vol_04_Iss_01/IJESAT_2014_01_01_09.pdf
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 Ashfaq, Syed Khan, Sher Afghan Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
description	Micro jets are used in the present experimental study as an active control. Flow from converging nozzle to suddenly expanded circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the base pressure and the flow development in the duct. Mach number and nozzle pressure ratio are considered as the flow parameters. The geometrical parameters considered are the area ratio of the sudden expansion duct cross-section area to the nozzle exit area and the length to diameter ratio of the duct. To find the effect of micro jets as an active control on base pressure as well as on the flow field developed in the duct, the micro jets of 1 mm orifice diameter are used. They are located at 900 intervals along a pitch circle diameter 1.3 times the nozzle exit diameter. In this study, the area ratio considered is 6.25. The flow parameter, nozzle pressure ratio (NPR) used were from 1.5 to 3, in steps of 0.5 and experiments were conducted for NPR 1.5, 2.0, 2.5 and 3.0. The geometrical parameter, the length to diameter ratio of the enlarged duct was varied from 10 to 1, and tests were conducted for L/D 10, 8, 6, 5, 4, 3, 2 and 1. When the micro jets were activated they are found to influence the base region, taking the base suction to considerably higher values compared to that for without control case for most of the cases. From the present study it is found that as the NPR increases, the effect on base pressure is marginal for NPRs up to 2.5; however, at NPR 3 there is a sudden decrease in the base pressure. Further, it is found that the micro jets are very effective in controlling the base pressure and the active control in the form of micro jets does not disturb the flow field in the duct, however, wall pressure becomes oscillatory at NPR 3.
format	Article
author	Ashfaq, Syed Khan, Sher Afghan
author_facet	Ashfaq, Syed Khan, Sher Afghan
author_sort	Ashfaq, Syed
title	Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
title_short	Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
title_full	Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
title_fullStr	Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
title_full_unstemmed	Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
title_sort	studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
publisher	International Journal of Engineering Science & Advanced Technology
publishDate	2014
url	http://irep.iium.edu.my/49906/ http://irep.iium.edu.my/49906/ http://irep.iium.edu.my/49906/1/2014_JAN_FEB_IJESAT.pdf
first_indexed	2023-09-18T21:10:30Z
last_indexed	2023-09-18T21:10:30Z
_version_	1777411220643512320

Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25

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