Base pressure studies from over expanded nozzle for area ratio 2.56
The present paper aims at study of variations in base pressure at different levels of over expansion of jet in a suddenly expanded axi-symmetric duct. The results of an experimental investigation carried out at two different fixed levels of Over Expansion namely 0.277 and 0.56 are compared. The are...
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Radiance Research Academy (Regd.)
2012
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my.iium.irep.499632016-07-18T01:38:58Z http://irep.iium.edu.my/49963/ Base pressure studies from over expanded nozzle for area ratio 2.56 Baig, Maughal Ahmed Al Khan, Sher Afghan Rathakrishnan, E. TL500 Aeronautics The present paper aims at study of variations in base pressure at different levels of over expansion of jet in a suddenly expanded axi-symmetric duct. The results of an experimental investigation carried out at two different fixed levels of Over Expansion namely 0.277 and 0.56 are compared. The area ratio of the present study is 2.56. The jet Mach numbers at the entry to the suddenly expanded duct, studied are 2.2 and 2.58. The length-to-diameter ratio of the suddenly expanded duct is varied from 10 to 1. Active control in the form of four micro jets of 1mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region are employed. In addition to base pressure, wall pressure field along the duct is also studied. From the present studies it is found that at a high level of over expansion micro jets are marginally effective. It is also found from wall pressure studies that the micro jets do not disturb the flow field in the enlarged duct. Radiance Research Academy (Regd.) 2012-06 Article REM application/pdf en http://irep.iium.edu.my/49963/4/49963-article.pdf Baig, Maughal Ahmed Al and Khan, Sher Afghan and Rathakrishnan, E. (2012) Base pressure studies from over expanded nozzle for area ratio 2.56. International Journal of Current Research and Review, 4 (11). pp. 107-112. ISSN 2231-2196 http://www.ijcrr.com/Journals/Vol%204%20issue%2011.pdf |
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TL500 Aeronautics Baig, Maughal Ahmed Al Khan, Sher Afghan Rathakrishnan, E. Base pressure studies from over expanded nozzle for area ratio 2.56 |
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The present paper aims at study of variations in base pressure at different levels of over expansion of jet
in a suddenly expanded axi-symmetric duct. The results of an experimental investigation carried out at two different fixed levels of Over Expansion namely 0.277 and 0.56 are compared. The area ratio of the present study is 2.56. The jet Mach numbers at the entry to the suddenly expanded duct, studied are 2.2 and 2.58. The length-to-diameter ratio of the suddenly expanded duct is varied from 10 to 1. Active control in the form of four micro jets of 1mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region are employed. In addition to base pressure, wall pressure field along the duct is also studied. From the present studies it is found that at a high level of over expansion micro jets are marginally effective. It is also found from wall pressure studies that the micro jets do not disturb the flow field in the enlarged duct. |
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Article |
author |
Baig, Maughal Ahmed Al Khan, Sher Afghan Rathakrishnan, E. |
author_facet |
Baig, Maughal Ahmed Al Khan, Sher Afghan Rathakrishnan, E. |
author_sort |
Baig, Maughal Ahmed Al |
title |
Base pressure studies from over expanded nozzle for area ratio 2.56 |
title_short |
Base pressure studies from over expanded nozzle for area ratio 2.56 |
title_full |
Base pressure studies from over expanded nozzle for area ratio 2.56 |
title_fullStr |
Base pressure studies from over expanded nozzle for area ratio 2.56 |
title_full_unstemmed |
Base pressure studies from over expanded nozzle for area ratio 2.56 |
title_sort |
base pressure studies from over expanded nozzle for area ratio 2.56 |
publisher |
Radiance Research Academy (Regd.) |
publishDate |
2012 |
url |
http://irep.iium.edu.my/49963/4/49963-article.pdf http://irep.iium.edu.my/49963/ http://www.ijcrr.com/Journals/Vol%204%20issue%2011.pdf |
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