Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)

An experimental investigation has been carried out to evaluate the capabilities of differential spoiler setting (DSS) in modifying the wingspan loading. The particle image velocimetery (PIV) technique was used in a low speed wind tunnel facility to measure wake velocities at four locations downstrea...

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Main Authors:	Elsayed, Omer Ali, Omar, Ashraf Ali E., Asrar, Waqar, Kwon, Kijung
Format:	Article
Language:	English
Published:	Elsevier Masson SAS 2011
Subjects:	TL500 Aeronautics
Online Access:	http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/1/Effect_of_differential_spoiler_setting_%28DSS%29_on_thye_wake_vortices_of_a_wing_at_high-lift-configuration_%28HLC%29.pdf

id	iium-2094
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spelling	iium-20942011-12-14T15:06:14Z http://irep.iium.edu.my/2094/ Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC) Elsayed, Omer Ali Omar, Ashraf Ali E. Asrar, Waqar Kwon, Kijung TL500 Aeronautics An experimental investigation has been carried out to evaluate the capabilities of differential spoiler setting (DSS) in modifying the wingspan loading. The particle image velocimetery (PIV) technique was used in a low speed wind tunnel facility to measure wake velocities at four locations downstream of the half model in the near wake field. The model was investigated at a high lift configuration (called base-line configuration) and at two different DSSs believed to modify the base-line wingspan loading. Those settings were obtained by deflecting spoiler number 1 at 10° (outboard loading case 1) and spoiler numbers 2, 3, 4, 5 and 6 at 5° (outboard loading case 2). Results reveal that, introducing a highly turbulent oscillatory wake due to a spoiler in the flow field increases the flap tip vortex meandering amplitude by up to 2.17 times the flap tip vortex core radius value. This result emphasizes the importance of using spatially corrected data in extracting mean vortex parameters values. Moreover meandering can lead to accelerated vortex breakdown especially when the vortex motion intensifies further downstream, contributing favorably to wake vortex alleviation. Integration of the streamwise vorticity shows a mild outboard wing loading shift for outboard loading case 1, while the outboard loading case 2 leads to a reduction in the span-wise circulation with no change in the spanwise load distribution. Evaluation of the effects of outboard loading case 1 on the flap tip vortex structure shows a reduction in the peak vorticity value to 0.46 of the base-line configuration value. This result indicates the effect of diffusion experienced by the vortex due to the increased level of turbulence in the wake. Result of the outboard loading case 2 shows a limited effect in terms of the wing tip vortex structure. This can be due to the relatively large separation distance between the wing tip and the deployed spoilers, preventing the spoiler wake/wing tip vortex interaction in the near field. Elsevier Masson SAS 2011-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/2094/1/Effect_of_differential_spoiler_setting_%28DSS%29_on_thye_wake_vortices_of_a_wing_at_high-lift-configuration_%28HLC%29.pdf Elsayed, Omer Ali and Omar, Ashraf Ali E. and Asrar, Waqar and Kwon, Kijung (2011) Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC). Aerospace Science and Technology, 15 (7). pp. 555-566. ISSN 1270-9638 http://www.sciencedirect.com/science/article/pii/S1270963810001513 doi:10.1016/j.ast.2010.11.001
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 Elsayed, Omer Ali Omar, Ashraf Ali E. Asrar, Waqar Kwon, Kijung Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
description	An experimental investigation has been carried out to evaluate the capabilities of differential spoiler setting (DSS) in modifying the wingspan loading. The particle image velocimetery (PIV) technique was used in a low speed wind tunnel facility to measure wake velocities at four locations downstream of the half model in the near wake field. The model was investigated at a high lift configuration (called base-line configuration) and at two different DSSs believed to modify the base-line wingspan loading. Those settings were obtained by deflecting spoiler number 1 at 10° (outboard loading case 1) and spoiler numbers 2, 3, 4, 5 and 6 at 5° (outboard loading case 2). Results reveal that, introducing a highly turbulent oscillatory wake due to a spoiler in the flow field increases the flap tip vortex meandering amplitude by up to 2.17 times the flap tip vortex core radius value. This result emphasizes the importance of using spatially corrected data in extracting mean vortex parameters values. Moreover meandering can lead to accelerated vortex breakdown especially when the vortex motion intensifies further downstream, contributing favorably to wake vortex alleviation. Integration of the streamwise vorticity shows a mild outboard wing loading shift for outboard loading case 1, while the outboard loading case 2 leads to a reduction in the span-wise circulation with no change in the spanwise load distribution. Evaluation of the effects of outboard loading case 1 on the flap tip vortex structure shows a reduction in the peak vorticity value to 0.46 of the base-line configuration value. This result indicates the effect of diffusion experienced by the vortex due to the increased level of turbulence in the wake. Result of the outboard loading case 2 shows a limited effect in terms of the wing tip vortex structure. This can be due to the relatively large separation distance between the wing tip and the deployed spoilers, preventing the spoiler wake/wing tip vortex interaction in the near field.
format	Article
author	Elsayed, Omer Ali Omar, Ashraf Ali E. Asrar, Waqar Kwon, Kijung
author_facet	Elsayed, Omer Ali Omar, Ashraf Ali E. Asrar, Waqar Kwon, Kijung
author_sort	Elsayed, Omer Ali
title	Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
title_short	Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
title_full	Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
title_fullStr	Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
title_full_unstemmed	Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)
title_sort	effect of differential spoiler settings (dss) on the wake vortices of a wing at high-lift-configuration (hlc)
publisher	Elsevier Masson SAS
publishDate	2011
url	http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/ http://irep.iium.edu.my/2094/1/Effect_of_differential_spoiler_setting_%28DSS%29_on_thye_wake_vortices_of_a_wing_at_high-lift-configuration_%28HLC%29.pdf
first_indexed	2023-09-18T20:09:37Z
last_indexed	2023-09-18T20:09:37Z
_version_	1777407390169169920

Effect of differential spoiler settings (DSS) on the wake vortices of a wing at high-lift-configuration (HLC)

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