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Normal shock wave/turbulent boundary-layer interaction control using 'smart' piezoelectric actuators

机译:使用“智能”压电致动器的正常冲击波/湍流边界层相互作用控制

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摘要

This paper looks at active control of the normal shock wave/turbulent boundary layer interaction (SBLI) 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 allows rapid thickening of the boundary-layer approaching the shock, which splits into a series of weaker shocks forming a lambda shock foot, thus reducing wave drag. Active control allows optimisation of the interaction, as it would be capable of either positioning the control region around the original shock position using a series of unimorph flaps or fixing the shock position by controlling the rate of mass transfer. The level of control achieved by unimorph piezoelectric actuators is not large because of small amounts of deflection possible. It is believed that to provide optimal control a piezoelectric material, which can provide greater strain and hence higher amounts of deflection is needed. However, currently such a piezoelectric material is not commercially available.
机译:本文着眼于使用智能襟翼执行器对正常冲击波/湍流边界层相互作用(SBLI)的主动控制。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。空腔允许接近冲击的边界层快速增厚,从而分成一系列较弱的冲击,从而形成λ冲击脚,从而减小了波浪阻力。主动控制可以优化交互作用,因为它可以使用一系列单压电晶片片将控制区域定位在原始震动位置周围,也可以通过控制传质速率来固定震动位置。单压电晶片致动器实现的控制水平不大,因为可能会发生少量偏转。相信提供最佳控制的压电材料可以提供更大的应变,因此需要更大的偏转量。但是,目前这种压电材料尚不能商购。

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