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Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation

Marinos Manolesos Orcid Logo, Spyros G. Voutsinas

Journal of Wind Engineering and Industrial Aerodynamics, Volume: 142, Pages: 130 - 148

Swansea University Author: Marinos Manolesos Orcid Logo

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DOI (Published version): 10.1016/j.jweia.2015.03.020

Abstract

The use of passive vortex generators (VGs) as a simple and effective way to delay or suppress separation on an airfoil optimized for wind turbine blades is examined experimentally. The profile experiences three-dimensional separation of the Stall Cell type. Pressure, Flow Visualization and Stereo Pa...

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Published in: Journal of Wind Engineering and Industrial Aerodynamics
ISSN: 0167-6105
Published: 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa38902
first_indexed 2018-02-28T19:50:49Z
last_indexed 2019-09-06T20:54:43Z
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spelling 2019-09-06T17:30:11.0770351 v2 38902 2018-02-28 Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation 44a3e0d351ccd7a8365d5fc7c50c8778 0000-0002-5506-6061 Marinos Manolesos Marinos Manolesos true false 2018-02-28 ACEM The use of passive vortex generators (VGs) as a simple and effective way to delay or suppress separation on an airfoil optimized for wind turbine blades is examined experimentally. The profile experiences three-dimensional separation of the Stall Cell type. Pressure, Flow Visualization and Stereo Particle Image Velocimetry experiments are discussed for the case of triangular counter rotating VGs with common flow up. For a Reynolds number of 0.87×106, Stall Cell formation is delayed for 5°, and lift increases up to α=15°. In total, maximum lift increases by 44%, while drag increases by 0.002 at pre-stall angles of attack. At α=16° the flow bifurcates between separated and attached flow conditions. At α=10° the flow is examined in detail and an investigation on the turbulence characteristics is carried out by correlating Reynolds stresses production to time averaged flow gradients. Strong turbulent interaction is observed between the two vortices and the underlying flow up to 37.2 VG heights downstream of the VGs, while further downstream (up to 47.2 VG heights) diffusion governs the flow. A wandering motion of the VG vortices leads to increased normal stress values between the two vortices. Journal Article Journal of Wind Engineering and Industrial Aerodynamics 142 130 148 0167-6105 Passive vortex generators, Stall Cells, Stereo particle image velocimetry 31 7 2015 2015-07-31 10.1016/j.jweia.2015.03.020 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2019-09-06T17:30:11.0770351 2018-02-28T18:09:28.8815242 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Marinos Manolesos 0000-0002-5506-6061 1 Spyros G. Voutsinas 2 0038902-30042018093722.pdf manolesos2015.pdf 2018-04-30T09:37:22.8270000 Output 4308501 application/pdf Accepted Manuscript true 2018-04-30T00:00:00.0000000 false eng
title Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
spellingShingle Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
Marinos Manolesos
title_short Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
title_full Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
title_fullStr Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
title_full_unstemmed Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
title_sort Experimental investigation of the flow past passive vortex generators on an airfoil experiencing three-dimensional separation
author_id_str_mv 44a3e0d351ccd7a8365d5fc7c50c8778
author_id_fullname_str_mv 44a3e0d351ccd7a8365d5fc7c50c8778_***_Marinos Manolesos
author Marinos Manolesos
author2 Marinos Manolesos
Spyros G. Voutsinas
format Journal article
container_title Journal of Wind Engineering and Industrial Aerodynamics
container_volume 142
container_start_page 130
publishDate 2015
institution Swansea University
issn 0167-6105
doi_str_mv 10.1016/j.jweia.2015.03.020
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The use of passive vortex generators (VGs) as a simple and effective way to delay or suppress separation on an airfoil optimized for wind turbine blades is examined experimentally. The profile experiences three-dimensional separation of the Stall Cell type. Pressure, Flow Visualization and Stereo Particle Image Velocimetry experiments are discussed for the case of triangular counter rotating VGs with common flow up. For a Reynolds number of 0.87×106, Stall Cell formation is delayed for 5°, and lift increases up to α=15°. In total, maximum lift increases by 44%, while drag increases by 0.002 at pre-stall angles of attack. At α=16° the flow bifurcates between separated and attached flow conditions. At α=10° the flow is examined in detail and an investigation on the turbulence characteristics is carried out by correlating Reynolds stresses production to time averaged flow gradients. Strong turbulent interaction is observed between the two vortices and the underlying flow up to 37.2 VG heights downstream of the VGs, while further downstream (up to 47.2 VG heights) diffusion governs the flow. A wandering motion of the VG vortices leads to increased normal stress values between the two vortices.
published_date 2015-07-31T07:19:43Z
_version_ 1821298480726933504
score 11.047415

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