Design of "Smart" flap actuators for swept shock wave/tubulent boundary layer interaction control

Couldrick, J. S.; Shankar, Krishna; Gai, S. L.; Milthorpe, J. F.

doi:10.1296/sem2003.16.05.01

Cited by 5 publications

(3 citation statements)

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“…Historically, active control of the shock/boundary-layer interaction (ACSBLI), although effective, has been hampered by the drag reduction achieved being negated by the additional drag due to the power requirements, for example, the pumping power in the case of mass transfer. The object of the present research (17)(18)(19)(20) is to assess the concept of active control using 'smart' flap actuators † (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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“…Historically, active control of shock/boundary-layer interaction (ACSBLI) has been hampered by the drag reduction 94 THE AERONAUTICAL JOURNAL FEBRUARY 2004 achieved being negated by the additional drag due to the power requirements, for example, the pump in the case of mass transfer and the drag of the devices in the case of vortex generators. The object of the present research (18)(19)(20) is to assess the concept of active control using 'smart' flap actuators, (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Active control of swept shock wave/turbulent boundary-layer interactions

et al. 2004

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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 control the rate of mass transfer.The actuators are modelled using classical composite material mechanics theory, namely analysis of a laminate with a uniform cross section. Furthermore a finite element modelling program (ANSYS 5.7) was used to produce improved results.

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“…Historically, active control of the shock wave/boundary-layer interaction (ACSBLI) has been hampered by the drag reduction achieved being negated by the additional drag due to the power requirements, for example, the pump in the case of mass transfer and the drag of the devices in the case of vortex generators. The object of the present research (18)(19)(20)(21)(22)(23)(24) is to assess the concept of active control using 'smart' flap actuators, (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Investigation of active control of swept shock wave/turbulent boundary-layer interactions – PSP results

et al. 2004

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An investigation of active control of the swept shock wave/boundary-layer interaction using 'smart' flap actuators is presented. 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. This splits the shock foot into a series of weaker shocks forming a lambda structure, thus reducing wave drag. Active control allows optimisation of the unimorph deflection, hence rate of mass transfer.In this paper, results of the interaction using pressure sensitive paint (PSP) are emphasised. It is shown that the use of PSP, in conjunction with discrete pressure data, enables the main features of the interaction to be observed when the actuators are subject to different deflections.

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Design of "Smart" flap actuators for swept shock wave/tubulent boundary layer interaction control

Cited by 5 publications

References 0 publications

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

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

Active control of swept shock wave/turbulent boundary-layer interactions

Investigation of active control of swept shock wave/turbulent boundary-layer interactions – PSP results

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