Control of suddenly expanded flows with micro-jets
The results of an experimental investigation carried out to control the base pressure in a suddenly expanded axi-symmetric passage are presented in this paper. Active control in the form of micro-jets was employed to control the base pressure. Air injection at four locations at the base, symmetric...
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| Format: | Article |
| Language: | English |
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Walter de Gruyter
2003
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| Online Access: | http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/1/khan_s_a_-_2003_-_control_micro_jets.pdf |
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eprints |
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iium-466912016-07-14T23:49:33Z http://irep.iium.edu.my/46691/ Control of suddenly expanded flows with micro-jets Khan, Sher Afghan Rathakrishnan, E. TL500 Aeronautics The results of an experimental investigation carried out to control the base pressure in a suddenly expanded axi-symmetric passage are presented in this paper. Active control in the form of micro-jets was employed to control the base pressure. Air injection at four locations at the base, symmetric to the nozzle axis was used as the active control. The jet Mach numbers at the entry to the suddenly expanded duct, studied were 1.87, 2.2 and 2.58. The length-to-diameter ratio of the suddenly expanded duct was varied from 10 to 1. Nozzles generating the above jet Mach numbers were operated with nozzle pressure ratio (NPR) in the range 3 to 11. In addition to base pressure, wall pressure field along the enlarged duct length was also studied. It is found that the active control in the form of blowing through small orifices (micro-jets) are effective in controlling the base pressure field. As high as 95 per cent increase in base pressure was achieved for certain combination of parameters of the present study. From the present investigation it is evident that for a given Mach number and NPR one can identify the L/D which will result in maximum increase/decrease of base pressure. Walter de Gruyter 2003-03 Article PeerReviewed application/pdf en http://irep.iium.edu.my/46691/1/khan_s_a_-_2003_-_control_micro_jets.pdf Khan, Sher Afghan and Rathakrishnan, E. (2003) Control of suddenly expanded flows with micro-jets. International Journal of Turbo & Jet-Engines, 20 (1). pp. 63-81. ISSN 0334-0082 E-ISSN 2191-0332 http://www.degruyter.com/view/j/tjj.2003.20.1/tjj.2003.20.1.63/tjj.2003.20.1.63.xml?format=INT 10.1515/TJJ.2003.20.1.63 |
| repository_type |
Digital Repository |
| institution_category |
Local University |
| institution |
International Islamic University Malaysia |
| building |
IIUM Repository |
| collection |
Online Access |
| language |
English |
| topic |
TL500 Aeronautics |
| spellingShingle |
TL500 Aeronautics Khan, Sher Afghan Rathakrishnan, E. Control of suddenly expanded flows with micro-jets |
| description |
The results of an experimental investigation carried out to
control the base pressure in a suddenly expanded axi-symmetric passage are presented in this paper. Active control in the form of micro-jets was employed to control the base pressure. Air injection at four locations at the base, symmetric to the nozzle axis was used as the
active control. The jet Mach numbers at the entry to the suddenly expanded duct, studied were 1.87, 2.2 and 2.58. The length-to-diameter ratio of the suddenly expanded duct was varied from 10 to 1. Nozzles generating the above jet Mach numbers were operated with nozzle pressure ratio (NPR) in the range 3 to 11. In addition to base pressure, wall pressure field along the enlarged duct length was also
studied. It is found that the active control in the form of blowing through small orifices (micro-jets) are effective in controlling the base pressure field. As high as 95 per cent increase in base pressure was achieved for certain combination of parameters of the present study. From the present investigation it is evident that for a given
Mach number and NPR one can identify the L/D which will result in maximum increase/decrease of base pressure. |
| format |
Article |
| author |
Khan, Sher Afghan Rathakrishnan, E. |
| author_facet |
Khan, Sher Afghan Rathakrishnan, E. |
| author_sort |
Khan, Sher Afghan |
| title |
Control of suddenly expanded flows with micro-jets |
| title_short |
Control of suddenly expanded flows with micro-jets |
| title_full |
Control of suddenly expanded flows with micro-jets |
| title_fullStr |
Control of suddenly expanded flows with micro-jets |
| title_full_unstemmed |
Control of suddenly expanded flows with micro-jets |
| title_sort |
control of suddenly expanded flows with micro-jets |
| publisher |
Walter de Gruyter |
| publishDate |
2003 |
| url |
http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/ http://irep.iium.edu.my/46691/1/khan_s_a_-_2003_-_control_micro_jets.pdf |
| first_indexed |
2023-09-18T21:06:27Z |
| last_indexed |
2023-09-18T21:06:27Z |
| _version_ |
1777410966028288000 |