Low-cost base drag reduction technique

A simple, low-cost, drag reduction device has been developed for applications in high-speed flows. This low-cost technology is expected to decrease fuel consumption (e.g., for high-speed vehicles such as rockets traveling from a highly over expanded flow at the sea level to a highly under expanded f...

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Main Authors:	Asad Ullah, Mohammed, Khan, Sher Afghan, Asrar, Waqar, Sulaeman, Erwin
Format:	Article
Language:	English English
Published:	International Journal of Mechanical Engineering and Robotics Research 2018
Subjects:	TL Motor vehicles. Aeronautics. Astronautics
Online Access:	http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/1/64798_Low-Cost%20Base%20Drag%20Reduction%20Technique.pdf http://irep.iium.edu.my/64798/7/64798_Low-cost%20base%20drag%20reduction%20technique_SCOPUS.pdf

id	iium-64798
recordtype	eprints
spelling	iium-647982018-07-31T01:13:06Z http://irep.iium.edu.my/64798/ Low-cost base drag reduction technique Asad Ullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin TL Motor vehicles. Aeronautics. Astronautics A simple, low-cost, drag reduction device has been developed for applications in high-speed flows. This low-cost technology is expected to decrease fuel consumption (e.g., for high-speed vehicles such as rockets traveling from a highly over expanded flow at the sea level to a highly under expanded flow in outer space). Somewhere in between the over and the under expansion, the rocket experiences perfectly expanded flows. In this study, only over expanded and perfectly expanded flows have been considered. A single cylinder with a diameter of 2 mm is rotated clockwise inside the recirculation zone (e.g., in high-speed vehicles) to act as a controller. The base pressure in the dead zone and the wall pressure along the square duct length have been measured with and without control. Experiments were carried out for nozzle pressure ratios (NPRs) of 2, 3, 6 and 7.8. When the cylinder was rotated clockwise as an active controller, the base pressure was found to increase by as much as 56% in the perfectly expanded case and up to 17% in over expanded flows. This drastic increase in the base pressure is correlated to an equivalent drag reduction. In addition, adding an active control had no negative impact on the main flow field. This is important as any disturbance in the main flow field at high speeds may lead to increased oscillations and vibrations, which if not checked may cause material failures. Rotating the cylinder in the clockwise direction near the wall was found to be very effective for higher NPRs. International Journal of Mechanical Engineering and Robotics Research 2018-07-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/64798/1/64798_Low-Cost%20Base%20Drag%20Reduction%20Technique.pdf application/pdf en http://irep.iium.edu.my/64798/7/64798_Low-cost%20base%20drag%20reduction%20technique_SCOPUS.pdf Asad Ullah, Mohammed and Khan, Sher Afghan and Asrar, Waqar and Sulaeman, Erwin (2018) Low-cost base drag reduction technique. International Journal of Mechanical Engineering and Robotics Research (IJMERR), 7 (4). pp. 428-432. ISSN 2315-4462 http://www.ijmerr.com/index.php?m=content&c=index&a=show&catid=161&id=975 10.18178/ijmerr.7.4.428-432
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TL Motor vehicles. Aeronautics. Astronautics
spellingShingle	TL Motor vehicles. Aeronautics. Astronautics Asad Ullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin Low-cost base drag reduction technique
description	A simple, low-cost, drag reduction device has been developed for applications in high-speed flows. This low-cost technology is expected to decrease fuel consumption (e.g., for high-speed vehicles such as rockets traveling from a highly over expanded flow at the sea level to a highly under expanded flow in outer space). Somewhere in between the over and the under expansion, the rocket experiences perfectly expanded flows. In this study, only over expanded and perfectly expanded flows have been considered. A single cylinder with a diameter of 2 mm is rotated clockwise inside the recirculation zone (e.g., in high-speed vehicles) to act as a controller. The base pressure in the dead zone and the wall pressure along the square duct length have been measured with and without control. Experiments were carried out for nozzle pressure ratios (NPRs) of 2, 3, 6 and 7.8. When the cylinder was rotated clockwise as an active controller, the base pressure was found to increase by as much as 56% in the perfectly expanded case and up to 17% in over expanded flows. This drastic increase in the base pressure is correlated to an equivalent drag reduction. In addition, adding an active control had no negative impact on the main flow field. This is important as any disturbance in the main flow field at high speeds may lead to increased oscillations and vibrations, which if not checked may cause material failures. Rotating the cylinder in the clockwise direction near the wall was found to be very effective for higher NPRs.
format	Article
author	Asad Ullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin
author_facet	Asad Ullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin
author_sort	Asad Ullah, Mohammed
title	Low-cost base drag reduction technique
title_short	Low-cost base drag reduction technique
title_full	Low-cost base drag reduction technique
title_fullStr	Low-cost base drag reduction technique
title_full_unstemmed	Low-cost base drag reduction technique
title_sort	low-cost base drag reduction technique
publisher	International Journal of Mechanical Engineering and Robotics Research
publishDate	2018
url	http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/ http://irep.iium.edu.my/64798/1/64798_Low-Cost%20Base%20Drag%20Reduction%20Technique.pdf http://irep.iium.edu.my/64798/7/64798_Low-cost%20base%20drag%20reduction%20technique_SCOPUS.pdf
first_indexed	2023-09-18T21:31:58Z
last_indexed	2023-09-18T21:31:58Z
_version_	1777412570619052032

Low-cost base drag reduction technique

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