Wing Planforms for Large Military Transports

Jobe, Charles E.; Kulfan, R. M.; Vachal, J. D.

doi:10.2514/3.58544

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thinner wing has less transonic wave drag, permitting the wing to unsweep thus favoring natural laminar flow. We choose the planform and strut dimensions as per the guidelines of Jobe et al, 49 resulting in a wingspan 1.5 times that of the baseline (see Figure 6 below). The main wing is based of the NASA SC(2)-0410 airfoil throughout its full span while the strut is interpolated from the NACA 64A-010 symmetric airfoil.…”

Section: Applications To Unconventional Aircraftmentioning

confidence: 99%

High-fidelity Aerodynamic Shape Optimization of Unconventional Aircraft through Axial Deformation

Gagnon

Zingg

2014

52nd Aerospace Sciences Meeting

View full text Add to dashboard Cite

This paper assesses the potential of unconventional aircraft configurations for regional transport through high-fidelity aerodynamic shape optimization. Several configurations are investigated: a C-tip blended-wing-body, a box-wing, and a truss-braced wing concept, and compared against a conventional jet similar in features and mission to the Bombardier CRJ-1000. In all cases the objective is to minimize drag subject to lift and trim constraints using a gradient-based optimizer coupled with a solver for the Euler equations governing inviscid compressible flow. A novel parameterization technique derived from a combination of axial and free-form deformation tools enables both planform and sectional shape changes to the main lifting surfaces. The sensitivities of the aerodynamic functionals, e.g. lift and drag, to the design variables are calculated analytically through the discrete-adjoint method. Results point to the strut-braced wing as the most promising configuration with induced drag reduction on the order of 46% relative to the tube-wing baseline.

show abstract

Section: Applications To Unconventional Aircraftmentioning

confidence: 99%

High-fidelity Aerodynamic Shape Optimization of Unconventional Aircraft through Axial Deformation

Gagnon

Zingg

2014

52nd Aerospace Sciences Meeting

View full text Add to dashboard Cite

show abstract

“…Several transonic and aeroelastic SBW design studies have been performed in the past [1][2][3][4][5][6] , although not with a full MDO approach. Recently, as proposed by Pfenninger, NASA became interested in revisiting the possibility of a strut-braced transonic transport.…”

Section: Figure 1 Conventional Cantilever Configurationmentioning

confidence: 99%

Multidisciplinary design optimization of a strut-braced wing transonic transport

Gundlac

Tetrault

Gern

et al. 2000

38th Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

Recent transonic airliner designs have generally converged upon a common cantilever low-wing configuration. It is unlikely that further large strides in performance are possible without a significant departure from the present design paradigm. One such alternative configuration is the strut-braced wing, which uses a strut for wing bending load alleviation, allowing increased aspect ratio and reduced wing thickness to increase the lift to drag ratio. The thinner wing has less transonic wave drag, permitting the wing to unsweep for increased areas of natural laminar flow and further structural weight savings. High aerodynamic efficiency translates into smaller, quieter, less expensive engines with lower noise pollution. A Multidisciplinary Design Optimization (MDO) approach is essential to understand the full potential of this synergistic configuration due to the strong interdependency of structures, aerodynamics and propulsion. NASA defined a need for a 325-passenger transport capable of flying 7500 nautical miles at Mach 0.85 for a 2010 service entry date. Lockheed Martin Aeronautical Systems (LMAS), as Virginia Tech's industry partner, placed great emphasis on realistic constraints, projected technology levels, manufacturing and certification issues. Numerous design challenges specific to the strut-braced wing became apparent through the interactions with LMAS.

show abstract

“…This led to the need for high aspect ratio wings, and the strut-braced wing concept arose for the same reasons that it was used by Hurel. Other strut-braced wing aircraft investigations followed Pfenninger's work, notably the work at Boeing reported by Jobe et al 4 and Park 5 from Stanford. The Boeing work is remarkable in that it used many of the methods that appeared later as being fundamental to an MDO toolkit.…”

Section: Introductionmentioning

confidence: 93%

Transport Weight Reduction Through MDO: The Strut-Braced Wing Transonic Transport

Gern

Llc

et al. 2005

35th AIAA Fluid Dynamics Conference and Exhibit

View full text Add to dashboard Cite

Multidisciplinary Design Optimization (MDO) has been used to investigate the use of a new concept for a transonic transport, the strut-braced wing. The incorporation of a strut into more traditional transonic transport concepts required the application of computational design techniques that had been developed at Virginia Tech over the previous decade. Formalized MDO methods were required to reveal the benefits of the tightly coupled interaction between the wing structural weight and the aerodynamic performance. To perform this study, a suite of approximate analysis tools was assembled into a complete, conceptual-level MDO code. A typical mission of the Boeing 777-200IGW was chosen as the design mission profile. Several single-strut configurations were optimized for minimum takeoff gross weight, with the best single-strut configuration showing a nearly20% reduction in takeoff gross weight, a 29% reduction in fuel weight, a 28% increase in the lift-to-drag ratio, and a 41% increase in seat-miles per gallon relative to a comparable cantilever configuration. The use of aeroelastic tailoring in the design illustrated ways to obtain further benefits. The paper synthesizes the results of the five-year effort, and concludes with a discussion of the effects various constraints have on the design, and lessons learned on computational design during the project.

show abstract

Wing Planforms for Large Military Transports

Cited by 8 publications

References 2 publications

High-fidelity Aerodynamic Shape Optimization of Unconventional Aircraft through Axial Deformation

High-fidelity Aerodynamic Shape Optimization of Unconventional Aircraft through Axial Deformation

Multidisciplinary design optimization of a strut-braced wing transonic transport

Transport Weight Reduction Through MDO: The Strut-Braced Wing Transonic Transport

Contact Info

Product

Resources

About