Review of Far-Field Drag Decomposition Methods for Aircraft Design

Fan, Yitong; Li, Weipeng

doi:10.2514/1.c034781

Cited by 22 publications

(9 citation statements)

References 64 publications

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“…In recent years, two advanced methods of drag-decomposition based on momentum conservation theory have been widely concerned. One of the methods is called wake integral, or the far-field method, which can compute drag components from the surface integration on the wake plane [115]. This method is not affected by the surface of the object, and it is also applicable to the complex shape.…”

Section: Geometric Parameters In Steady Statementioning

confidence: 99%

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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Wingtip slots, where the outer primary feathers of birds split and spread vertically, are regarded as an evolved favorable feature that could effectively improve their aerodynamic performance. They have inspired many to perform experiments and simulations as well as to relate their results to aircraft design. This paper aims to provide guidance for the research on the aerodynamic mechanism of wingtip slots. Following a review of previous wingtip slot research, four imperfections are put forward: vacancies in research content, inconsistencies in research conclusions, limitations of early research methods, and shortage of the aerodynamic mechanism analysis. On this basis, further explorations and expansion of the influence factors for steady state are needed; more attention should be poured into the application of flow field integration method to decompose drag, and evaluation of variation in induced drag seems a more rational choice. Geometric and kinematic parameters of wingtip slot structure in the unsteady state, as well as the flexibility of wingtips, should be taken into account. As for the aerodynamic mechanism of wingtip slots, the emphasis can be placed on the study of the formation, development, and evolution of wingtip vortices on slotted wings. Besides, some research strategies and feasibility analyses are proposed for each part of the research.

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Section: Geometric Parameters In Steady Statementioning

confidence: 99%

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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“…The wing deformations of this vehicle have been studied by applying piezoelectric actuators inside the wing (a type of smart material) [11]. Barcala et al [12] studied these modifications in 2018. Piezoelectric actuators are a piezoceramic material, a type of smart material whose length is modified depending on the voltage applied, that produces modifications of the wing curvature inside the wing.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of Aerodynamic Performances of a Morphing Micro Air Vehicle

2021

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The present work is focused on the investigation of the aerodynamic performances of a novedous bioinspired morphing Micro Air Vehicle (MAV) with an adaptive wing structure geometry. For this purpose, a numerical study of Computational Fluid Dynamics (CFD) implemented by Ansys Fluent 15.0 was performed in order to obtain insight about the aerodynamic effect of wing structure deformation when morphing devices are used, and its influence on the global aerodynamic parameters related with aircraft performances. On the other hand, an experimental study using the Particle Image Velocimetry technique and balance measurements in a Low-Speed Wind Tunnel was conducted to obtain experimental information about performances measured to establish a comparison between both, experimental and numerical results. The Micro Air Vehicle (MAV) presents a Zimmerman wing with an Eppler 61 airfoil. Three different wing configurations according to curvature and thickness variations and for all angles of attack have been studied. A comparative analysis based on aerodynamic features is performed by an assessment of lift coefficient (CL), total aerodynamic drag coefficient (CD) and aerodynamic efficiency as lift/drag ratio (CL/CD) in order to conclude the best wing configuration in terms of aerodynamic performance.

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“…Nevertheless, there are far-field methods for the estimation of the drag force that allow the prediction with a level of accuracy similar to a fine grid by identifying the spurious drag sources. A review of all these methods is given in [6]. In this work, the formulation described in [13] has been implemented.…”

Section: Introductionmentioning

confidence: 99%

Multi-fidelity Surrogate Assisted Design Optimisation of an Airfoil under Uncertainty Using Far-Field Drag Approximation

Morales

Köröndi

Quagliarella

et al. 2021

Advances in Uncertainty Quantification and Optimization Under Uncertainty With Aerospace Applications

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Uncertainty-based optimisation techniques provide optimal airfoil designs that are less vulnerable to the presence of uncertainty in the operational conditions (i.e., Mach number, angle-of-attack, etc.) at which an airfoil is functioning. These uncertainty-based techniques typically require numerous function evaluations to accurately calculate the statistical measure of the quantity of interest. To render the computational burden down, the design optimisation of the airfoil is performed by a multi-fidelity surrogate-based technique. The high-fidelity aerodynamic performance is calculated with a compressible RANS solver using a fine grid. At the low-fidelity level a coarser grid is used. To obtain accurate drag predictions despite the lower grid resolution the so-called far-field drag approximation is employed.

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Review of Far-Field Drag Decomposition Methods for Aircraft Design

Cited by 22 publications

References 64 publications

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

Numerical and Experimental Study of Aerodynamic Performances of a Morphing Micro Air Vehicle

Multi-fidelity Surrogate Assisted Design Optimisation of an Airfoil under Uncertainty Using Far-Field Drag Approximation

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