Higher-Harmonic Deployment of Trailing-Edge Flaps for Rotor-Performance Enhancement and Vibration Reduction

作者：Kody Frank^*; Corle Ethan; Maughmer Mark D; Schmitz Sven

来源：Journal of Aircraft, 2016, 53(2): 333-342.

DOI：10.2514/1.C033335

A computational method involving evolutionary-based optimization to provide an optimal set of higher-harmonic deployment schedules for a multisegment trailing-edge flap is investigated. The trailing-edge flap is added to the UH-60A's rotor, with the flap's span, deflection angles, and start/end deployment azimuth positions all optimized to minimize the total rotor power and the resulting hub vibratory loads. The formal optimization effort is carried out through the coupling of a comprehensive analysis code and one of two evolutionary algorithm-based optimizers. With regard to a single-segment flap, peak power savings over the flight envelope reached 9.5% (at an advance ratio of 0.30) with associated out-of-plane and in-plane hub vibration reductions of 66 and 22%, respectively. The dual-segment trailing-edge flap optimization with a span limitation yielded power savings of 8.9% at the same flight condition. Multi-objective optimizations were performed at a target flight condition with an advance ratio of 0.3 for a total of four objectives: minimizing rotor power and all three hub vibratory loads. One optimum solution found 6.7% power savings, 68% out-of-plane hub vibration reductions, and 53% in-plane hub vibration reductions.

• 出版日期2016-4