Fast and accurate quasi-3D aerodynamic methods for aircraft conceptual design studies

Gabor, Oliviu Şugar; Koreanschi, Andreea

doi:10.1017/aer.2020.128

Cited by 2 publications

(1 citation statement)

References 45 publications

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“…Sugar-Gabor [17,18] combined the unsteady K-J theorem with the lifting-line method, and calculated the unsteady aerodynamic force of the 3D pitching wing based on the steady data of the 2D aerofoil. Parenteau [19] coupled 2D Unsteady Reynolds-averaged Navier-Stokes (URANS) data with unsteady vortex lattice method and calculated the pitching wing at low reduced frequencies.…”

Section: Introductionmentioning

confidence: 99%

An unsteady aerodynamic model for three-dimensional wing based on augmented lifting-line method

Zhou

Guo

2022

Aeronaut. j.

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A fast numerical method for unsteady aerodynamic calculation of 3D wing is established, which is suitable for the preliminary design. Based on the lifting-line method, the aerodynamic data of the 2D aerofoil obtained by the unsteady CFD simulation is used as the model input to solve the aerodynamic force of the 3D wing. Compared with the traditional steady lifting-line method, the augmented method adopts the unsteady Kutta-Jouowski (K-J) theorem to calculate the circulation and improve the accuracy of the method through the circulation correction. The pitching motion of 3D wing at different aspect ratio and reduction frequencies are studied. The results show that the aerodynamic forces obtained by the augmented lifting-line method have good agreement with the 3D unsteady CFD calculations. Compared with 3D CFD calculation, the calculation efficiency of the improved method is increased by more than 12 times. The improved method has extensive applicability and can be used to estimate the unsteady aerodynamic forces of 3D single or multiple wing configurations.

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Section: Introductionmentioning

confidence: 99%

An unsteady aerodynamic model for three-dimensional wing based on augmented lifting-line method

Zhou

Guo

2022

Aeronaut. j.

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Verification & validation of lifting line - and -formulations for 3-D planforms under viscous flows

et al. 2023

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Many adaptations of the lifting-line theory have been developed since its conception to aid in preliminary aerodynamic wing design, but they typically fall into two main formulations, named $\alpha $ - and $\Gamma $ -formulation, which differ in terms of the control points chordwise location and the variable updated during the iterative scheme. This paper assess the advantages and drawbacks of both formulations through the implementation of the respective methods and application of standard verification and validation procedures. Verification showed that the $\Gamma $ -method poorly converges for wings with nonstraight quarter-chord lines, while the $\alpha $ -method presents adequate convergence rates and uncertainties for all geometries; it also showed that the $\Gamma $ -method agrees best with analytic results from the cassic lifting-line theory, indicating that it tends to overpredict wing lift. Validation and comparison to other modern lifting-line methods was done for similar geometries, and not only corroborated the poor converge and lift overprediction of the $\Gamma $ -method, but also showed that the $\alpha $ -method presented the closest results to experimental data for almost all cases tested, concluding that this formulation is typically superior regardless of the wing geometry. These results indicate that the implemented $\alpha $ -method has a greater potential for the extension of the lifting-line theory to more geometrically complex lifting surfaces other than fixed wings with straight quarter-chord lines and wakes constrained to the planform plane.

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Fast and accurate quasi-3D aerodynamic methods for aircraft conceptual design studies

Cited by 2 publications

References 45 publications

An unsteady aerodynamic model for three-dimensional wing based on augmented lifting-line method

An unsteady aerodynamic model for three-dimensional wing based on augmented lifting-line method

Verification & validation of lifting line - and -formulations for 3-D planforms under viscous flows

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