Control of suddenly expanded flow from correctly expanded nozzles
The effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric ducts has been presented in this paper. Four micro jets of 1 mm orifice diameter located at 90° intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region were employed a...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2004
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46700/ http://irep.iium.edu.my/46700/1/khan_s_a_-_2004_-_control_correctly.pdf |
| _version_ | 1848783013128699904 |
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| author | Khan, Sher Afghan Rathakrishnan, E. |
| author_facet | Khan, Sher Afghan Rathakrishnan, E. |
| author_sort | Khan, Sher Afghan |
| building | IIUM Repository |
| collection | Online Access |
| description | The effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric ducts has been presented in this paper. Four micro jets of 1 mm orifice diameter located at 90° intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region were employed as active controls. The Mach numbers of the suddenly expanded flows were 1.25, 1.30, 1.48, 1.6, 1.8 and 2.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 2.56, 3.24, 4.84, and 6.25 times that of nozzle exit area. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. The jets at all Mach numbers were correctly expanded. It is found that the micro jets can serve as active controllers for base pressure. Also, the wall pressure distribution is not adversely influenced by the micro jets. |
| first_indexed | 2025-11-14T16:14:36Z |
| format | Article |
| id | iium-46700 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T16:14:36Z |
| publishDate | 2004 |
| publisher | De Gruyter |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-467002016-07-14T23:51:54Z http://irep.iium.edu.my/46700/ Control of suddenly expanded flow from correctly expanded nozzles Khan, Sher Afghan Rathakrishnan, E. TL500 Aeronautics The effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric ducts has been presented in this paper. Four micro jets of 1 mm orifice diameter located at 90° intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region were employed as active controls. The Mach numbers of the suddenly expanded flows were 1.25, 1.30, 1.48, 1.6, 1.8 and 2.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 2.56, 3.24, 4.84, and 6.25 times that of nozzle exit area. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. The jets at all Mach numbers were correctly expanded. It is found that the micro jets can serve as active controllers for base pressure. Also, the wall pressure distribution is not adversely influenced by the micro jets. De Gruyter 2004-12 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46700/1/khan_s_a_-_2004_-_control_correctly.pdf Khan, Sher Afghan and Rathakrishnan, E. (2004) Control of suddenly expanded flow from correctly expanded nozzles. International Journal of Turbo & Jet-Engines, 21 (4). pp. 255-278. ISSN 0334-0082 E-ISSN 2191-0332 http://www.degruyter.com/view/j/tjj.2004.21.4/tjj.2004.21.4.255/tjj.2004.21.4.255.xml 10.1515/TJJ.2004.21.4.255 |
| spellingShingle | TL500 Aeronautics Khan, Sher Afghan Rathakrishnan, E. Control of suddenly expanded flow from correctly expanded nozzles |
| title | Control of suddenly expanded flow from correctly expanded nozzles |
| title_full | Control of suddenly expanded flow from correctly expanded nozzles |
| title_fullStr | Control of suddenly expanded flow from correctly expanded nozzles |
| title_full_unstemmed | Control of suddenly expanded flow from correctly expanded nozzles |
| title_short | Control of suddenly expanded flow from correctly expanded nozzles |
| title_sort | control of suddenly expanded flow from correctly expanded nozzles |
| topic | TL500 Aeronautics |
| url | http://irep.iium.edu.my/46700/ http://irep.iium.edu.my/46700/ http://irep.iium.edu.my/46700/ http://irep.iium.edu.my/46700/1/khan_s_a_-_2004_-_control_correctly.pdf |