Flow Control for Aircraft Performance Enhancements -Overview of Airbus - University Cooperation -

Bieler, H.; Abbas, Adel T.; Chiaramonte, Jean-Yves; Sawyers, David

doi:10.2514/6.2006-3692

Cited by 8 publications

(5 citation statements)

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“…This process is now highly mature, and therefore further aerodynamic gains from geometric optimization alone are becoming increasingly non-cost-effective to achieve [1]. Aircraft designers are therefore looking for alternative approaches to unlocking improved aerodynamic performance that do not depend on increasingly complex geometries.…”

Section: Introductionmentioning

confidence: 99%

“…Current generation civil transport aircraft are based on evolutionary development of basic designs established in the 1950s, and, historically, most improvements in aerodynamic performance have come through continued refinement of the aircraft external geometry. This process is now highly mature, and therefore further aerodynamic gains from geometric optimization alone are becoming increasingly non-cost-effective to achieve [1]. Aircraft designers are therefore looking for alternative approaches to unlocking improved aerodynamic performance that do not depend on increasingly complex geometries.…”

Section: Introductionmentioning

confidence: 99%

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An evaluation of the mass and power scaling of synthetic jet actuator flow control technology for civil transport aircraft applications

Crowther

Gomes

2008

Proceedings of the Institution of Mechanical Engineers, Part I:

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This paper aims to develop understanding of the systems costs associated with the application of flow control systems to civil transport aircraft based on the use of electrically powered synthetic jet actuators (SJAs). The study is based on the development of a low-order mass model using estimated power specific masses of generation, management, distribution, and conversion subsystems; application of existing empirical rules for application of pneumatic boundary layer mixing flow control devices to determine the required fluid power for an A320 case study application; and characterization and optimization of lab-based SJA technology to establish realistic estimates for power conversion efficiency and actuator maximum authority. The peak velocity obtained from a velocity-optimized synthetic jet actuator was 130 m/s, at a corresponding power efficiency of 7 per cent. The highest power efficiency obtained was 14 per cent, corresponding to a peak velocity of 70 m/s. The power specific mass for the overall flow control system considered for the A320 application is estimated to be around 1 kg of system mass per kW of electrical power required, of which around 50 per cent is due to power generation and 30 per cent is due to power conversion (actuation).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An evaluation of the mass and power scaling of synthetic jet actuator flow control technology for civil transport aircraft applications

Crowther

Gomes

2008

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…One prominent application of flow control is in the transport industry, in particular, the air transport, in which a significant reduction of drag corresponds to large fuel savings and a lower level of CO 2 emissions (Bieler et al 2006;Spalart & McLean 2011). For these high-Reynolds-number situations, an understanding of the Reynolds number effect is crucial, as a knowledge of the drag reduction achievable at a cruise condition gives an important insight into the applicability of the control method.…”

Section: Introductionmentioning

confidence: 99%

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

2014

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription For more information, please contact the WRAP Team at: wrap@warwick.ac.ukUnder consideration for publication in J. Fluid Mech. 1The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves This paper exploits the turbulent flow control method using streamwise travelling waves ) to study the effect of Reynolds number on turbulent skin-friction drag reduction. Direct numerical simulations of a turbulent channel flow subjected to the streamwise travelling waves of spanwise wall velocity have been performed at Reynolds numbers ranging from Re τ = 200 to 1600. To the best of the authors' knowledge, this is the highest Reynolds number attempted with DNS for this type of flow control. The present DNS results confirm that the effectiveness of drag reduction deteriorates, and the maximum drag reduction achieved by travelling waves decreases significantly as the Reynolds number increases. The intensity of both the drag reduction and drag increase is reduced with the Reynolds number. Another important finding is that the value of the optimal control parameters changes, even in wall units, when the Reynolds number is increased. This trend is observed for the wall oscillation, stationary wave, and streamwise travelling wave cases. This implies that, when the control parameters used are close to optimal values found at a lower Reynolds number, the drag reduction deteriorates rapidly with increased Reynolds number. In this study, the effect of Reynolds number for the travelling wave is quantified using a scaling in the form Re −α τ . No universal constant is found for the scaling parameter α. Instead, the scaling parameter α has a wide range of values depending on the flow control conditions. Further Reynolds number scaling issues are discussed. Turbulent statistics are analysed to explain a weaker drag reduction observed at high Reynolds numbers. The changes in the Stokes layer and also the mean and r.m.s. velocity with the Reynolds number are also reported. The Reynolds shear stress analysis suggests an interesting possibility of a finite drag reduction at very high Reynolds numbers.

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“…Effective and reliable flow control to reduce turbulent skin friction drag is of paramount importance in many engineering applications, including aerospace engineering, where the skin friction component is approximately one quarter of the total aircraft drag in flight condition [1]. Various control strategies have been developed for turbulent drag reduction [2,3], with many of them focusing on the manipulation of the near-wall turbulence structures, such as streamwise vortices, which are responsible for most of turbulent kinetic energy production [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of active flow control for turbulent skin friction drag reduction

Chung

Talha

2011

Physics of Fluids

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The effectiveness of the opposition control method proposed by Choi et al . [H. Choi, P. Moin, and J. Kim, J. Fluid Mech. 262, 75-110 (1994)] has been studied using direct numerical simulations. In this study, the effects of the amplitude and the phase of wall blowing and suction control input were considered separately. It is found that the amplitude of wall blowing and suction as well as the detection plane location played an important role in active control for skin friction drag reduction. By changing the amplitude, a substantial drag reduction was achieved for all detection plane locations considered, and the efficiency of the opposition control was also improved. When the control was effective, the drag reduction was proportional to the wall blowing and suction strength. There existed a maximum wall blowing and suction strength, beyond which the opposition control became less effective or even unstable. Turbulence characteristics affected by various wall blowing and suction parameters were analysed to understand * Corresponding author: Y.M.Chung@warwick.ac.uk the underlying mechanisms for drag reduction. The wall normal velocity and vorticity fluctuations showed a strong correlation with drag reduction.

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Flow Control for Aircraft Performance Enhancements -Overview of Airbus - University Cooperation -

Cited by 8 publications

References 0 publications

An evaluation of the mass and power scaling of synthetic jet actuator flow control technology for civil transport aircraft applications

An evaluation of the mass and power scaling of synthetic jet actuator flow control technology for civil transport aircraft applications

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

Effectiveness of active flow control for turbulent skin friction drag reduction

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