Stochastic Investigation on the Robustness of Laminar-Flow Wings for Flight Tests

Yang, Tihao; Chen, Yifu; Shi, Yayun; Hua, Jianfeng; Qin, Feifei; Bai, Junqiang

doi:10.2514/1.j060842

Cited by 5 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Natural Laminar Flow (NLF), which maintains the wing planform and airfoil shape with a favorable pressure distribution, is one of the most promising methods for reducing aircraft drag [36]. Through a comparison of turbulence and NLF aircraft for mid-range transport missions, Xu and Kroo [37] investigated the advantages of NLF design.…”

Section: Introductionmentioning

confidence: 99%

Aerostructural Optimization and Comparative Study of Twin-Fuselage and Strut-Braced-Wing Aircraft Configurations

Ma,

Abouhamzeh,

Elham

2024

Journal of Aircraft

View full text Add to dashboard Cite

The ultrahigh-aspect-ratio wing (UHARW) concept is a promising configuration to achieve future sustainable aviation goals. Twin-fuselage (TF) and strut-braced-wing (SBW) configurations are characterized by smaller structural bending moments and shear forces in the wing and are promising concepts for realizing UHARW designs. This paper addresses the aerostructural optimization problem of TF and SBW configurations with UHARW by using a coupled adjoint aerostructural optimization tool, which is composed of a geometrically nonlinear structural solver and a quasi-three-dimensional natural laminar flow (NLF) aerodynamic solver. The optimization results show significant improvements in fuel efficiency and performance for the TF and SBW aircraft, with fuel mass reductions of 13 and 10%, respectively, compared to the corresponding baseline aircraft designed in the conceptual design phase. In comparison to the original reference aircraft A320neo, the optimized TF and SBW have 48 and 31% lower fuel weights, respectively. The NLF range of both upper and lower wing surfaces is expanded during optimization. The optimized SBW configuration has a wing aspect ratio of 26.01, while the optimized TF has a wing aspect ratio of 20.74, indicating that the SBW concept is more conducive to realizing UHARW design compared with the TF configuration studied in this work. The optimized TF aircraft has a lighter fuel weight and gross weight compared to the optimized SBW aircraft, which is because the TF aircraft has a lighter operational empty weight, including a lighter fuselage structural weight, landing gear weight, etc., whereas the top-level aircraft requirements are the same for both aircraft, including range, payload, and cruise Mach.

show abstract

Section: Introductionmentioning

confidence: 99%

Aerostructural Optimization and Comparative Study of Twin-Fuselage and Strut-Braced-Wing Aircraft Configurations

Ma,

Abouhamzeh,

Elham

2024

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

“…Natural Laminar Flow (NLF) is one of the most promising approaches for drag reduction because of the lower skin friction drag, which maintains a large laminar flow range by shaping the airfoil shape and wing platform with a favorable pressure distribution [29]. Xu and Kroo [30] integrated NLF into aircraft conceptual design and investigated the benefits of NLF design by comparing turbulent and NLF aircraft for mid-range transport missions.…”

Section: Introductionmentioning

confidence: 99%

Geometrically Nonlinear Coupled Adjoint Aerostructural Optimization of Natural-Laminar-Flow Strut-Braced Wing

Abouhamzeh

Elham

2023

Journal of Aircraft

View full text Add to dashboard Cite

Novel aircraft concepts employing ultrahigh-aspect-ratio wings, such as the strut-braced wing (SBW) configuration, are promising ways to achieve the next-generation sustainable and fuel-efficient aviation goals. However, as the wing aspect ratio increases, the wing increasingly exhibits more flexibility, higher deformation, and geometrically nonlinear behavior that cannot be accurately simulated by conventional sizing methods and typical linear structural analysis models. This paper establishes a framework for SBW aircraft conceptual design, conceptual optimization, and aerostructural optimization. The presented aerostructural optimization method has medium-fidelity and physics-based features. A geometrically nonlinear structural analysis solver and a quasi-three-dimensional aerodynamic solver are coupled for the aerostructural optimization of composite natural-laminar-flow SBW aircraft. A medium-range (MR)-SBW aircraft is initially designed and optimized in the conceptual design stage. A gradient-based aerostructural optimization is performed using the proposed tool for minimizing the fuel mass of the initially sized and optimized MR-SBW aircraft. The optimization results in a more than 10% reduction in fuel mass, a more than 8% reduction in aircraft maximum takeoff mass, and a more than 30% reduction in wing and strut structural weight by optimizing the wing box structure, the wing planform, and the airfoil shape while satisfying the constraints on structural failure, wing loading, and aileron effectiveness.

show abstract

Uncertainty Quantification and Sensitivity Analysis of Closure Parameters of Transition Models

Liu

Song

2023

J. Aerosp. Eng.

View full text Add to dashboard Cite

Stochastic Investigation on the Robustness of Laminar-Flow Wings for Flight Tests

Cited by 5 publications

References 21 publications

Aerostructural Optimization and Comparative Study of Twin-Fuselage and Strut-Braced-Wing Aircraft Configurations

Aerostructural Optimization and Comparative Study of Twin-Fuselage and Strut-Braced-Wing Aircraft Configurations

Geometrically Nonlinear Coupled Adjoint Aerostructural Optimization of Natural-Laminar-Flow Strut-Braced Wing

Uncertainty Quantification and Sensitivity Analysis of Closure Parameters of Transition Models

Contact Info

Product

Resources

About