Nozzle expansion level effect on a suddenly expanded flow
This investigation focuses attention on the effectiveness of active control in the form of micro-jets, located at the base region of a suddenly expanded axi-symmetric ducts, to control the base pressure. The experiments were conducted for Mach numbers 1.25, 1.3, 1.48, 1.6, 1.8, 2.0, 2.5, and 3.0 at...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Walter de Gruyter
2006
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46701/ http://irep.iium.edu.my/46701/1/khan_s_a_-_2006_-_nozzle_expansion.pdf |
| _version_ | 1848783013436981248 |
|---|---|
| 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 | This investigation focuses attention on the effectiveness of active control in the form of micro-jets, located at the base region of a suddenly expanded axi-symmetric ducts, to control the base pressure. The experiments were conducted for Mach numbers 1.25, 1.3, 1.48, 1.6, 1.8, 2.0, 2.5, and 3.0 at NPRs 3, 5, 7, 9, and 11. The area ratios considered were 2.56, 3.24, 4.84, and 6.25. It is found that with increase of NPR the control becomes very effective in increasing the base pressure for all Mach numbers in the range from 1.25 to 2.0. But for higher Mach numbers the control results in decrease of base pressure compared to without control case for Mach number range from 2.5 to 3.0 for NPR 5, 7 and 9. It is found that the micro-jets can serve as active controllers for base pressure. Control effectivness increases for under expanded jets. The wall pressure distribution in the duct was also measured. It is found that the wall pressure distribution is not adversely influenced by the micro-jets. |
| first_indexed | 2025-11-14T16:14:36Z |
| format | Article |
| id | iium-46701 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T16:14:36Z |
| publishDate | 2006 |
| publisher | Walter de Gruyter |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-467012016-07-14T23:55:07Z http://irep.iium.edu.my/46701/ Nozzle expansion level effect on a suddenly expanded flow Khan, Sher Afghan Rathakrishnan, E. TL Motor vehicles. Aeronautics. Astronautics TL780 Rockets This investigation focuses attention on the effectiveness of active control in the form of micro-jets, located at the base region of a suddenly expanded axi-symmetric ducts, to control the base pressure. The experiments were conducted for Mach numbers 1.25, 1.3, 1.48, 1.6, 1.8, 2.0, 2.5, and 3.0 at NPRs 3, 5, 7, 9, and 11. The area ratios considered were 2.56, 3.24, 4.84, and 6.25. It is found that with increase of NPR the control becomes very effective in increasing the base pressure for all Mach numbers in the range from 1.25 to 2.0. But for higher Mach numbers the control results in decrease of base pressure compared to without control case for Mach number range from 2.5 to 3.0 for NPR 5, 7 and 9. It is found that the micro-jets can serve as active controllers for base pressure. Control effectivness increases for under expanded jets. The wall pressure distribution in the duct was also measured. It is found that the wall pressure distribution is not adversely influenced by the micro-jets. Walter de Gruyter 2006-12 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46701/1/khan_s_a_-_2006_-_nozzle_expansion.pdf Khan, Sher Afghan and Rathakrishnan, E. (2006) Nozzle expansion level effect on a suddenly expanded flow. International Journal of Turbo & Jet-Engines, 23 (4). pp. 233-257. ISSN 0334-0082 E-ISSN 2191-0332 http://www.degruyter.com/view/j/tjj.2006.23.4/tjj.2006.23.4.233/tjj.2006.23.4.233.xml 10.1515/TJJ.2006.23.4.233 |
| spellingShingle | TL Motor vehicles. Aeronautics. Astronautics TL780 Rockets Khan, Sher Afghan Rathakrishnan, E. Nozzle expansion level effect on a suddenly expanded flow |
| title | Nozzle expansion level effect on a suddenly expanded flow |
| title_full | Nozzle expansion level effect on a suddenly expanded flow |
| title_fullStr | Nozzle expansion level effect on a suddenly expanded flow |
| title_full_unstemmed | Nozzle expansion level effect on a suddenly expanded flow |
| title_short | Nozzle expansion level effect on a suddenly expanded flow |
| title_sort | nozzle expansion level effect on a suddenly expanded flow |
| topic | TL Motor vehicles. Aeronautics. Astronautics TL780 Rockets |
| url | http://irep.iium.edu.my/46701/ http://irep.iium.edu.my/46701/ http://irep.iium.edu.my/46701/ http://irep.iium.edu.my/46701/1/khan_s_a_-_2006_-_nozzle_expansion.pdf |