Periodic transonic flow and control

Raghunathan, Srinivasan; Early, Juliana; Tulita, Catalin; Bénard, Emmanuel; Quest, Jürgen

doi:10.1017/s0001924000001949

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…Previous investigations have been reported in the literature to explain the influence of wall cooling on boundary layers (Redford et al, 2012;Lynch and Fancher, 1983), with a particular interest for drag reduction in transonic and supersonic regimes. Buffet Transonic buffet of a space launcher aileron control based on wall cooling is also discussed in the literature (Raghunathan and Zarifi-Rad, 1992;Tulita et al, 2004;Raghunathan et al, 2008), showing a decrease of the amplitude of the SWBLI. However the physical mechanisms associated to this effect on buffet are not yet fully identified in previous studies.…”

Section: Wall Temperature-based Controlmentioning

confidence: 99%

Transonic buffet of a space launcher aileron: Fanno and Rayleigh flows analogies

Gourdain

Dumon

Bury

et al. 2021

HFF

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Purpose The transonic buffet is a complex aerodynamics phenomenon that imposes severe constraints on the design of high-speed vehicles, including for aircraft and space launchers. The origin of buffet is still debated in the literature, and the control of this phenomenon remains difficult. This paper aims to propose an original scenario to explain the origin of buffet, which in turn opens promising perspectives for its alleviation and attenuation. Design/methodology/approach This work relies on the use of numerical simulations, with the idea to reproduce the buffet phenomenon in a transonic aileron designed for small space launchers. Two numerical approaches are tested: unsteady Reynolds averaged Navier–Stokes (URANS) and large-eddy simulation (LES). The numerical predictions are first validated against available experimental data, before to be analysed in detail to identify the origin of buffet on the studied configuration. A complementary numerical study is then conducted to assess the possibility to delay the onset of buffet. Findings The buffet control strategy is based on wall cooling. By adequately choosing the wall temperature, this work shows that it is feasible to delay the emergence of buffet. More precisely, this paper highlights the crucial role of the subsonic flow inside the boundary layer, showing the existence of upstream travelling pressure waves that are responsible for the flow coupling between both sides of the airfoil, at the origin of the buffet phenomenon. Originality/value This paper proposes a new scenario to explain the origin of buffet, based on the use of a Fanno and Rayleigh flow analogies. This approach is used to design a control solution based on a modification of the wall temperature, showing very promising results.

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Section: Wall Temperature-based Controlmentioning

confidence: 99%

Transonic buffet of a space launcher aileron: Fanno and Rayleigh flows analogies

Gourdain

Dumon

Bury

et al. 2021

HFF

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“…The goals of shock control are to implement a device which reduces the shock strength and consequently wave drag and/or to delay the buffet onset and thus to reduce emissions, extend the flight envelop and/or reduce flow induced vibrations. While the drag reduction potential of SCBs has been investigated over almost the past three decades [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], buffet control by SCBs has been investigated less extensively [6][7][8][9][26][27][28][29]. For detailed research on buffet control via SCBs the reader is referred to Mayer [6] and Mayer et al [7].…”

Section: Introductionmentioning

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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“…6,7 Genesis of supercritical wing after 1970s renovated concerns in the field of buffeting. [8][9][10] Experimental tests have supplied a rich source for the numerical simulations. [11][12][13] More correction about these codes, grid generation, turbulence modeling, etc., can predict problems related to the field of buffet more accurate.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of buffet detection on supercritical airfoils in transonic regime

Golestani

Bonab

Soltani

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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Conventional buffet onset methods for a 2D supercritical airfoil, SC0410, in transonic regime for various Mach number and various angles of attack have been surveyed. The existing methods give good results for high subsonic and transonic regimes, but demand a computational procedure to detect the buffet onset. One of these methods, trailing edge pressure divergence, that have been recognized inappropriate in other studies for supercritical airfoils, shows acceptable result at least for the present supercritical airfoil. A new method has been proposed by the authors for transonic regime that is based on the physical definition of the buffet onset from the surface pressure distribution diagram. This method does not require any special calculations. The data scrutiny shows good agreement by this method in comparison with the conventional schemes.

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Periodic transonic flow and control

Cited by 14 publications

References 46 publications

Transonic buffet of a space launcher aileron: Fanno and Rayleigh flows analogies

Transonic buffet of a space launcher aileron: Fanno and Rayleigh flows analogies

Review of Adaptive Shock Control Systems

An experimental study of buffet detection on supercritical airfoils in transonic regime

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