Graduate Thesis Or Dissertation


Vortex Generator Flow Control for an Upper-Surface Blown Aircraft Wing with an Extended Coanda Flap Public Deposited

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  • Integrated Distributed Electric Augmented Lift (IDEAL) applies upper-surface blowing in a novel way using an array of electric ducted fans (EDFs) to achieve electric short take-off and landing to meet the growing need for urban air transportation. Additional research on the use of vortex generators (VGs) to reduce flow separation on upper-surface blown trailing edge flaps at low Reynolds numbers was necessary to advance the technological readiness of IDEAL. Design factors based on previous research on upper-surface blown flaps by Boeing and NASA were selected to leverage the Coanda effect to improve flow turning and augment lift. The four factors investigated in this study were the EDF rotation direction, VG chordwise position, distance between vanes, and angle of incidence of the vanes. The Taguchi method was used to efficiently explore the design space in a full-scale wind tunnel experiment. Experimental results demonstrated similar flow turning and lift performance to the Boeing YC-14 and NASA QSRA with lower exhaust velocities. Statistical analysis of the experimental results was used to predict the performance of an optimum configuration, but the actual performance measured in a confirmation test was 5.3% lower than the prediction. This may be the result of noise in the data, interactions between the design factors, or that the correct design space was not identified. Based on the results of this study, recommendations for future work were made to reduce noise and increase the effectiveness of the VG configuration.
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