The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance
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The Ohio State University / OhioLINK
2019
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516043121521 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu15555160431215212021-08-03T07:10:18Z The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance Hussain, Ali Aerospace Engineering aerodynamics active flow control boundary layer fence swept wing experimental wind tunnel Active flow control (AFC) in the form of a wall normal slot was investigated on a NACA 643-618 laminar wing model. The wing model has a leading-edge sweep of (Λ = 30°) and tests were performed using a chordwise Reynolds number of 100,000 with a specific focus on the stall characteristics and changes in performance of an AFC slot with spanwise location. The study included comparing a passive boundary layer fence (BLF) and an AFC slot at the same spanwise locations: 0.60z/b, 0.70z/b, and 0.80z/b. Changing the location of the passive BLF resulted in increases in the maximum lift coefficient (CLMax) over the baseline ranging from 10.20-19.30%, with higher gains seen for fences closer to the root. The BLF at 0.60z/b experienced an unstable longitudinal static stability derivative (CMα) at an angle 13° higher than the baseline. Moving the fence outboard to 0.80z/b resulted in delaying this unstable behavior by an additional α=6°. An AFC slot was found to improve upon aspects of the BLF performance at all spanwise locations tested for a Cμ=10.33%. The slot was found to improve CLMax by up to 23.4% at the lowest spanwise location tested (0.60z/b) and this decreased to a 10.6% benefit at 0.80z/b. For the AFC slot, maximum lift performance increased monotonically as more momentum was introduced into the system. In all cases, moving the slot further outboard increased the stall angle. At all spanwise locations, the AFC slot outperformed the BLF in terms of delaying stall and an unstable CMα. Fluorescent tufts were used to visualize the surface flow for the baseline and AFC at all spanwise locations. The results corroborated the load cell findings and helped to visualize separation and spanwise flow at key angles of attack such as stall for the baseline wing. At higher angles of attack, evidence of the AFC slot could clearly be seen in the attached, streamwise flow directly outboard of the fence location. Evidence of a fence and tip vortices were also present for the AFC configurations, explaining the increased lift benefits seen. 2019-08-26 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516043121521 http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516043121521 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. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Aerospace Engineering aerodynamics active flow control boundary layer fence swept wing experimental wind tunnel |
| spellingShingle |
Aerospace Engineering aerodynamics active flow control boundary layer fence swept wing experimental wind tunnel Hussain, Ali The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| author |
Hussain, Ali |
| author_facet |
Hussain, Ali |
| author_sort |
Hussain, Ali |
| title |
The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| title_short |
The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| title_full |
The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| title_fullStr |
The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| title_full_unstemmed |
The Effect of Spanwise Location of an Active Boundary Layer Fence on Swept Wing Performance |
| title_sort |
effect of spanwise location of an active boundary layer fence on swept wing performance |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2019 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516043121521 |
| work_keys_str_mv |
AT hussainali theeffectofspanwiselocationofanactiveboundarylayerfenceonsweptwingperformance AT hussainali effectofspanwiselocationofanactiveboundarylayerfenceonsweptwingperformance |
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1719455334295142400 |