Control of suddenly expanded flow for area ratio 3.61

Airflow from convergent axisymmetric nozzle expanded suddenly into 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. The flow parameters considered in this investigatio...

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Main Authors:	Syed, Syed Ashfaq, Khan, Sher Afghan, E., Rathakrishnan
Format:	Article
Language:	English
Published:	rspublication 2013
Subjects:	T Technology (General) TJ170 Mechanics applied to machinery. Dynamics
Online Access:	http://irep.iium.edu.my/49895/ http://irep.iium.edu.my/49895/ http://irep.iium.edu.my/49895/1/2013_DECEMBER_IJAST.pdf

id	iium-49895
recordtype	eprints
spelling	iium-498952016-11-23T00:59:43Z http://irep.iium.edu.my/49895/ Control of suddenly expanded flow for area ratio 3.61 Syed, Syed Ashfaq Khan, Sher Afghan E., Rathakrishnan T Technology (General) TJ170 Mechanics applied to machinery. Dynamics Airflow from convergent axisymmetric nozzle expanded suddenly into 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. The flow parameters considered in this investigation are Mach number at the nozzle exit and the nozzle pressure ratio. The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area and the length to diameter ratio of the duct. To investigate the influence of active control on base pressure as well as on the flow field developed in the duct, the micro jets of 1 mm orifice diameter located at 900 interval along a pitch circle diameter (pcd) 1.3 times the nozzle exit diameter were employed as the controller of base pressure. The area ratio of the present study is 3.61. The 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 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. The experimental investigation on suddenly expanded flow field covering the above flow and geometrical parameters revealed that the base pressure is strongly influenced by the geometrical parameters viz length to diameter ratio, Mach number and the nozzle pressure ratio (NPR). The level of expansion at the nozzle exit (i.e. before sudden expansion) influences the base pressure very strongly. rspublication 2013-12 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49895/1/2013_DECEMBER_IJAST.pdf Syed, Syed Ashfaq and Khan, Sher Afghan and E., Rathakrishnan (2013) Control of suddenly expanded flow for area ratio 3.61. International Journal of Advanced Scientific and Technical Research (IJAST, 6 (3). pp. 1-11. ISSN 2249-9954 http://www.rspublication.com/ijst/index.html
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	T Technology (General) TJ170 Mechanics applied to machinery. Dynamics
spellingShingle	T Technology (General) TJ170 Mechanics applied to machinery. Dynamics Syed, Syed Ashfaq Khan, Sher Afghan E., Rathakrishnan Control of suddenly expanded flow for area ratio 3.61
description	Airflow from convergent axisymmetric nozzle expanded suddenly into 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. The flow parameters considered in this investigation are Mach number at the nozzle exit and the nozzle pressure ratio. The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area and the length to diameter ratio of the duct. To investigate the influence of active control on base pressure as well as on the flow field developed in the duct, the micro jets of 1 mm orifice diameter located at 900 interval along a pitch circle diameter (pcd) 1.3 times the nozzle exit diameter were employed as the controller of base pressure. The area ratio of the present study is 3.61. The 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 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. The experimental investigation on suddenly expanded flow field covering the above flow and geometrical parameters revealed that the base pressure is strongly influenced by the geometrical parameters viz length to diameter ratio, Mach number and the nozzle pressure ratio (NPR). The level of expansion at the nozzle exit (i.e. before sudden expansion) influences the base pressure very strongly.
format	Article
author	Syed, Syed Ashfaq Khan, Sher Afghan E., Rathakrishnan
author_facet	Syed, Syed Ashfaq Khan, Sher Afghan E., Rathakrishnan
author_sort	Syed, Syed Ashfaq
title	Control of suddenly expanded flow for area ratio 3.61
title_short	Control of suddenly expanded flow for area ratio 3.61
title_full	Control of suddenly expanded flow for area ratio 3.61
title_fullStr	Control of suddenly expanded flow for area ratio 3.61
title_full_unstemmed	Control of suddenly expanded flow for area ratio 3.61
title_sort	control of suddenly expanded flow for area ratio 3.61
publisher	rspublication
publishDate	2013
url	http://irep.iium.edu.my/49895/ http://irep.iium.edu.my/49895/ http://irep.iium.edu.my/49895/1/2013_DECEMBER_IJAST.pdf
first_indexed	2023-09-18T21:10:29Z
last_indexed	2023-09-18T21:10:29Z
_version_	1777411219444989952

Control of suddenly expanded flow for area ratio 3.61

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