GSW0058 Structural design of "smart" actuator flaps for control of shock wave/boundary layer interaction

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

doi:10.1299/jsmeatem.2003.2._gsw0058-1

Cited by 2 publications

(2 citation statements)

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“…The underlying idea of using perforated strips and cavities in the EUROSHOCK projects [12,16], as introduced in Section 1, is based on different pressure levels which are present in the vicinity of the transonic shock. These pressure differences can lead to a re-circulation of the air flow through the cavity and perforated skin and thus affect the shock [12,16,79,80]. Moreover, these pressure differences can also be used to deform a flexible plate which is described in the following section.…”

Section: Using Pressure Differences In the Shock Regionmentioning

confidence: 99%

Review of Adaptive Shock Control Systems

et al. 2021

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Drag reduction plays a major role in future aircraft design in order to lower emissions in aviation. In transonic flight, the transonic shock induces wave drag and thus increases the overall aircraft drag and hence emissions. In the past decades, shock control has been investigated intensively from an aerodynamic point of view and has proven its efficacy in terms of reducing wave drag. Furthermore, a number of concepts for shock control bumps (SCBs) that can adapt their position and height have been introduced. The implementation of adaptive SCBs requires a trade-off between aerodynamic benefits, system complexity and overall robustness. The challenge is to find a system with low complexity which still generates sufficient aerodynamic improvement to attain an overall system benefit. The objectives of this paper are to summarize adaptive concepts for shock control, and to evaluate and compare them in terms of their advantages and challenges of their system integrity so as to offer a basis for robust comparisons. The investigated concepts include different actuation systems as conventional spoiler actuators, shape memory alloys (SMAs) or pressurized elements. Near-term applications are seen for spoiler actuator concepts while highest controllability is identified for concepts several with smaller actuators such as SMAs.

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Section: Using Pressure Differences In the Shock Regionmentioning

confidence: 99%

Review of Adaptive Shock Control Systems

et al. 2021

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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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GSW0058 Structural design of "smart" actuator flaps for control of shock wave/boundary layer interaction

Cited by 2 publications

References 0 publications

Review of Adaptive Shock Control Systems

Review of Adaptive Shock Control Systems

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

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