Effects of micro jets on the flow field of the duct with sudden expansion

This paper presents the results of an experimental investigation to study the effectiveness of the control jets to control base pressure in rapidly expanded circular tubes. Four tiny jets of 1 mm orifice diameter located at ninety degrees interval in cross shape along a pitch circle diameter of 1.3....

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Main Authors: Akhtar, Mohammad Nishat, Abu Bakar, Elmi, Aabid, Abdul, Khan, Sher Afghan
Format: Article
Language:English
English
Published: Blue Eyes Intelligence Engineering & Sciences 2019
Subjects:
Online Access:http://irep.iium.edu.my/74735/1/74735_Effects%20of%20Micro%20jets%20on%20the%20Flow.pdf
http://irep.iium.edu.my/74735/7/74735_Effects%20of%20micro%20jets%20on%20the%20flow%20field%20of%20the%20duct%20with%20sudden%20expansion_Scopus.pdf
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Institution: Universiti Islam Antarabangsa Malaysia
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spelling my.iium.irep.747352019-11-24T15:49:30Z http://irep.iium.edu.my/74735/ Effects of micro jets on the flow field of the duct with sudden expansion Akhtar, Mohammad Nishat Abu Bakar, Elmi Aabid, Abdul Khan, Sher Afghan TL Motor vehicles. Aeronautics. Astronautics TL500 Aeronautics This paper presents the results of an experimental investigation to study the effectiveness of the control jets to control base pressure in rapidly expanded circular tubes. Four tiny jets of 1 mm orifice diameter located at ninety degrees interval in cross shape along a pitch circle diameter of 1.3. The Mach number, the L/D ratio, and the area ratio of the study were 2.8, from 1 to 10, and 4.84, respectively. The nature of the flow field, the development of the flow in the duct, as well as the static wall pressure distribution in the duct was measured and discussed. The results indicate that the tiny jets can be used as an active dynamic controller for the base pressure. The wall pressure distribution is not adversely influenced by the small jets. From the present investigation, it is evident that for a given Mach number and nozzle pressure ratio one can identify the minimum duct L/D needed for the flow remained attached with the wall of the duct. The trend for the duct length L = 5D seems to show different results, due to the influence of back pressure and the peak pressure values are also less than that those were for higher L/D ratios, especially in respect of L/D = 5. Further, the flow field has smoothened in the duct, and wall pressure values with and without micro jets are identical. This trend continues until L/D = 4, then later for lower L/Ds like L/D = 3, the flow seems to be attached at higher NPRs. But for lower NPRs the flow is not attached. Blue Eyes Intelligence Engineering & Sciences 2019-07-30 Article PeerReviewed application/pdf en http://irep.iium.edu.my/74735/1/74735_Effects%20of%20Micro%20jets%20on%20the%20Flow.pdf application/pdf en http://irep.iium.edu.my/74735/7/74735_Effects%20of%20micro%20jets%20on%20the%20flow%20field%20of%20the%20duct%20with%20sudden%20expansion_Scopus.pdf Akhtar, Mohammad Nishat and Abu Bakar, Elmi and Aabid, Abdul and Khan, Sher Afghan (2019) Effects of micro jets on the flow field of the duct with sudden expansion. International Journal of Innovative Technology and Exploring Engineering (IJITEE), 8 (9S2). pp. 636-640. E-ISSN 2277-3075 https://www.ijitee.org/wp-content/uploads/papers/v8i9S2/I11290789S219.pdf 10.35940/ijitee.I1129.0789S219
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
English
topic TL Motor vehicles. Aeronautics. Astronautics
TL500 Aeronautics
spellingShingle TL Motor vehicles. Aeronautics. Astronautics
TL500 Aeronautics
Akhtar, Mohammad Nishat
Abu Bakar, Elmi
Aabid, Abdul
Khan, Sher Afghan
Effects of micro jets on the flow field of the duct with sudden expansion
description This paper presents the results of an experimental investigation to study the effectiveness of the control jets to control base pressure in rapidly expanded circular tubes. Four tiny jets of 1 mm orifice diameter located at ninety degrees interval in cross shape along a pitch circle diameter of 1.3. The Mach number, the L/D ratio, and the area ratio of the study were 2.8, from 1 to 10, and 4.84, respectively. The nature of the flow field, the development of the flow in the duct, as well as the static wall pressure distribution in the duct was measured and discussed. The results indicate that the tiny jets can be used as an active dynamic controller for the base pressure. The wall pressure distribution is not adversely influenced by the small jets. From the present investigation, it is evident that for a given Mach number and nozzle pressure ratio one can identify the minimum duct L/D needed for the flow remained attached with the wall of the duct. The trend for the duct length L = 5D seems to show different results, due to the influence of back pressure and the peak pressure values are also less than that those were for higher L/D ratios, especially in respect of L/D = 5. Further, the flow field has smoothened in the duct, and wall pressure values with and without micro jets are identical. This trend continues until L/D = 4, then later for lower L/Ds like L/D = 3, the flow seems to be attached at higher NPRs. But for lower NPRs the flow is not attached.
format Article
author Akhtar, Mohammad Nishat
Abu Bakar, Elmi
Aabid, Abdul
Khan, Sher Afghan
author_facet Akhtar, Mohammad Nishat
Abu Bakar, Elmi
Aabid, Abdul
Khan, Sher Afghan
author_sort Akhtar, Mohammad Nishat
title Effects of micro jets on the flow field of the duct with sudden expansion
title_short Effects of micro jets on the flow field of the duct with sudden expansion
title_full Effects of micro jets on the flow field of the duct with sudden expansion
title_fullStr Effects of micro jets on the flow field of the duct with sudden expansion
title_full_unstemmed Effects of micro jets on the flow field of the duct with sudden expansion
title_sort effects of micro jets on the flow field of the duct with sudden expansion
publisher Blue Eyes Intelligence Engineering & Sciences
publishDate 2019
url http://irep.iium.edu.my/74735/1/74735_Effects%20of%20Micro%20jets%20on%20the%20Flow.pdf
http://irep.iium.edu.my/74735/7/74735_Effects%20of%20micro%20jets%20on%20the%20flow%20field%20of%20the%20duct%20with%20sudden%20expansion_Scopus.pdf
http://irep.iium.edu.my/74735/
https://www.ijitee.org/wp-content/uploads/papers/v8i9S2/I11290789S219.pdf
_version_ 1651865954918858752