Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control
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| Language: | English |
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The Ohio State University / OhioLINK
2018
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu15241469588773112021-08-03T07:06:16Z Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control Walker, Michael Monroe Aerospace Engineering swept wing active flow control experimental aerodynamics boundary-layer fence boundary layer fence BLF AFC The effect of passive and active boundary-layer fences (BLF) on a NACA 643-618 laminar wing (aspect ratio = 4.3) at a chordwise Reynolds number of 100,000 with sweep (lambda = 30°) is evaluated. The application of a passive BLF at z/b = 0.7 is responsible for an increase in the maximum lift coefficient (CL max) of 14.3%, a higher stall angle of attack (alpha) by 10°, and a delay in alpha by 16° where an unstable longitudinal static stability derivative (CMalpha) first occurs. The application of an active flow control (AFC) wall-normal steady blowing slot at z/b = 0.7 is responsible for an increase in CL max of 12.8%, a higher stall alpha by 17°, and a delay in alpha of 23° where an unstable CMalpha first occurs. Stereo-PIV results reveal that both configurations (passive BLF and AFC slot) create two vortices (a fence vortex and a tip vortex) which along with the physical fence itself are responsible for restoring lift outboard of the fence/slot, resulting in beneficial performance gains observed at higher alpha. Surface flow visualization via fluorescent tufts corroborates these findings. Duplicating (and even improving upon) the effects of passive flow control through active flow control allows for significant performance benefits at higher alpha (with AFC turned on), while avoiding the drag penalties of a passive fence by turning AFC off at lower a where control is unnecessary. Computational simulations of similar test configurations are performed match well with experimental results, further enhancing confidence of findings and showing promise for future predictive tools with respect to this form of active flow control as applied to a swept-wing. 2018-08-14 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311 http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Aerospace Engineering swept wing active flow control experimental aerodynamics boundary-layer fence boundary layer fence BLF AFC |
| spellingShingle |
Aerospace Engineering swept wing active flow control experimental aerodynamics boundary-layer fence boundary layer fence BLF AFC Walker, Michael Monroe Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| author |
Walker, Michael Monroe |
| author_facet |
Walker, Michael Monroe |
| author_sort |
Walker, Michael Monroe |
| title |
Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| title_short |
Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| title_full |
Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| title_fullStr |
Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| title_full_unstemmed |
Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control |
| title_sort |
replicating the effects of a passive boundary-layer fence via active flow control |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311 |
| work_keys_str_mv |
AT walkermichaelmonroe replicatingtheeffectsofapassiveboundarylayerfenceviaactiveflowcontrol |
| _version_ |
1719453738036363264 |