Adjoint based aerodynamic optimization of supersonic biplane airfoils

Hu, Rui; Jameson, Antony; Wang, Qiqi

doi:10.2514/6.2011-1248

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…Recently, these were also implemented on a number of cruise missiles like the North Korean 'Musudan' missile (9) . The concept of utilising a bi-plane concept as proposed by Adolf Busemann, to reduce wave drag and sonic boom has also been studied for commercial supersonic flights (10) .…”

Section: Introductionmentioning

confidence: 99%

Effect of aspect ratio variation on subsonic aerodynamics of cascade type grid fin at different gap-to-chord ratios

2019

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This paper dwells upon investigating the effect of aspect ratio (AR) variation on the aerodynamic performance of unconventional control surfaces called grid fins by virtue of a series of subsonic experiments on a simplified grid fin variant called the cascade fin. Wind tunnel tests were performed for different AR (variable span) grid fins. The same had been investigated for different gap-to-chord ratio (g/c) variants. Results demonstrated a tangible increase in the aerodynamic efficiency as well as stall angle reduction for higher AR. Moreover, higher AR leads to increased pitching moment, which emphasizes elevated hinge moment requirements. The study ensued the presence of higher deviation between the low AR fins, that is $AR<2$ compared to the pertinent deviations between the high AR fins, that is $AR\geq2$ . The effect associated with these variations was termed as span effect in this paper. It was established that, the deviations arising due to this phenomena were lesser for higher g/c and higher AR. The analysis of AR variation for different g/c presented a limiting value of AR reduction for stall performance enhancement. Thus, optimised selection of the g/c and AR values can lead to enhanced aerodynamic efficiency alongside an improved stalling characteristic.

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Section: Introductionmentioning

confidence: 99%

Effect of aspect ratio variation on subsonic aerodynamics of cascade type grid fin at different gap-to-chord ratios

2019

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“…Their findings included the lift, drag coefficients, and pressure coefficient distribution over such airfoils. Finally, the recent study of Hu et al [15] focused on finding the optimum design of a doublewedge biplane airfoil for minimum drag at zero incidence.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Design Parameters of a Diamond-Shaped Supersonic Airfoil

El-Gohary¹,

Ahmed²

2013

International Conference on Aerospace Sciences and Aviation Tec

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The lifting surfaces of supersonic flying vehicles generally have sharp leading edges. The airfoil sections of such wings produce the desired lift and, more importantly, yield less drag compared with the conventional blunt airfoils commonly used with subsonic flying vehicles. It is evident that, under given flight conditions, the aerodynamic characteristics of a supersonic airfoil namely, its aerodynamic coefficients are strongly dependent on its geometry. More interestingly, the variation in these coefficients is non-monotonic with the variation in the airfoil design. In the present paper, a parametric study is conducted on a diamond-shaped airfoil of a 10% thickness-to-chord ratio. The objective is to investigate the impact of the airfoil design on its performance. A computer code is developed based on the exact shock-expansion theory to estimate the pressure distribution over the airfoil and, hence, its corresponding aerodynamic coefficients. It was found that, the aerodynamic coefficients of the airfoil are sensitive to its design. In addition, the designs for maximum lift and minimum drag coefficients are competing. A nearly-symmetric airfoil would yield a maximum aerodynamic efficiency.

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“…This has been applied extensively in aerodynamic optimisation [9,10,11,12,13]. The gradient of the objective function must however be smoothed in order to ensure smooth surfaces are generated, as with such a high number of design variables is it easy to produce noisy surface shapes.…”

Section: Surface Points As Design Variablesmentioning

confidence: 99%

“…Optimisation of Busemann biplanes has been performed before using other parameterisation schemes [11,66] but these optimisations have been aimed at improving the performance of an already existing biplane configuration, typically to improve performance when the biplane is used as a lifting body at non-zero angle of attack. In this work, the possibility of using a parameterisation scheme capable of topological change to harness the benefits of shock cancellation between bodies to reduce drag is explored.…”

Section: Supersonic Minimum Drag Bodiesmentioning

confidence: 99%

A volumetric geometry and topology parameterisation for fluids-based optimisation

et al. 2017

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. A volumetric geometry and topology parameterisation for fluids-based optimisation. Computers and Fluids, 148,[137][138][139][140][141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156] University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractA new geometry and topology parameterisation method is presented which is based on creating a parameterisation grid of cells and reconstructing surfaces from the fraction of the cell volume defined to be solid, with the volume fractions acting as design variables. This method is able to include topological changes alongside fine-level geometric control, and therefore offers a significant increase in flexibility. In this work, the geometric capabilities of the method are confirmed by successfully constructing a variety of surfaces, using both arbitrary object outlines and aerofoil geometries. The method is then used in a range of optimisation problems covering the design of a coastal defence, increasing fluid damping within an oscillating box by the addition of baffles, and design of a multi-body configuration for minimum drag in supersonic flow. These problems demonstrate the benefits of a parameterisation for fluids modelling that is capable of topological changes and which can be used with global search as well as gradient-based methods.

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Adjoint based aerodynamic optimization of supersonic biplane airfoils

Cited by 11 publications

References 11 publications

Effect of aspect ratio variation on subsonic aerodynamics of cascade type grid fin at different gap-to-chord ratios

Effect of aspect ratio variation on subsonic aerodynamics of cascade type grid fin at different gap-to-chord ratios

Investigating the Design Parameters of a Diamond-Shaped Supersonic Airfoil

A volumetric geometry and topology parameterisation for fluids-based optimisation

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