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Design of 'Smart' flap actuators for swept shock wave/turbulent boundary layer interaction control

机译:用于扫频冲击波/湍流边界层相互作用控制的“智能”襟翼执行器设计

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摘要

Piezoelectric actuators have long been recognised for use in aerospace structures for control of structural shape. This paper looks at active control of the swept shock wave/turbulent boundary layer interaction using smart flap actuators. The actuators are manufactured by bonding piezoelectric material to an inert substrate to control the bleed/suction rate through a plenum chamber. The cavity provides communication of signals across the shock, allowing rapid thickening of the boundary layer approaching the shock, which splits into a series of weaker shocks forming a lambda shock foot, reducing wave drag. Active control allows optimum control of the interaction, as it would be capable of positioning the control region around the original shock position and unimorph tip deflection, hence mass transfer rates. The actuators are modelled using classical composite material mechanics theory, as well as a finite element-modelling program (ANSYS 5.7).
机译:压电致动器早已被认可用于航空航天结构中以控制结构形状。本文着眼于使用智能襟翼执行器主动控制扫频冲击波/湍流边界层相互作用。通过将压电材料粘合到惰性基板上以控制通过增压室的放气/吸气速率来制造致动器。空腔在整个电击中提供信号的通讯,从而使靠近电击的边界层迅速变厚,从而分成一系列较弱的电击,从而形成了λ型电击脚,从而减小了波阻。主动控制允许对相互作用进行最佳控制,因为它可以将控制区域定位在原始冲击位置和单压电晶片尖端偏转附近,从而使传质速率更高。使用经典的复合材料力学理论以及有限元建模程序(ANSYS 5.7)对执行器进行建模。

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