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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/49895/1/2013_DECEMBER_IJAST.pdf
http://irep.iium.edu.my/49895/
http://www.rspublication.com/ijst/index.html
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spelling my.iium.irep.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 REM 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
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 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/49895/1/2013_DECEMBER_IJAST.pdf
http://irep.iium.edu.my/49895/
http://www.rspublication.com/ijst/index.html
_version_ 1643613618489524224
score 13.211869

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