Honors College Thesis
 

Trailing Edge Flap Optimization for an Upper-Surface Blown Aircraft Wing

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https://ir.library.oregonstate.edu/concern/honors_college_theses/5425kj45x

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  • Integrated Distributed Electric Augmented Lift (IDEAL) applies upper surface blowing in a novel way to achieve electric short take-off and landing to meet the growing need for urban air transportation. Additional research on propulsion airframe interaction (PAI) with 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 were the upper surface flap radius, chordwise flap position, jet thickness, and exhaust mass flow rate. The Taguchi method was used to efficiently explore the design space with two-dimensional computational fluid dynamics. Experimental results demonstrated the effectiveness of PAI with Coanda flaps to achieve flow turning and lift augmentation at low Reynolds numbers. Statistical analysis of the experimental results identified an optimum configuration that achieved lift coefficients above 7.00 with flow turning up to 45°. The optimum configuration showed a 169% lift increase at 0° AOA and a 77% increase at 10° AOA over the sum of parts which indicated a synergistic effect from PAI with Coanda flaps.
  • Key Words: upper surface blowing, propulsion airframe interaction, Coanda effect
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