Aerodynamic and structural studies of joined-wing aircraft

Kroo, Ilan; Smith, Stephen C.; Gallman, John W.

doi:10.2514/3.45994

Cited by 49 publications

(35 citation statements)

References 6 publications

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“…To determine the optimum position, a trade-off between the weight and the aerodynamic performance has to be taken into account. Previous investigations [21] have demonstrated that the induced drag of the joined-wing configuration is unexpectedly similar to that of a conventional design having the same wing area and span width. Therefore, if a new asymmetric concept is adopted for the torque box of the wing [19] in order to improve its resistance under bending loads, then it is possible to achieve wing weight reductions of up to 40 per cent compared to a conventional aircraft.…”

Section: Joined-wing Aircraft Designmentioning

confidence: 74%

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Conceptual design of a medium-sized joined-wing aircraft

Cuerno-Rejado

Alonso-Albir

Gehse

2009

Proceedings of the Institution of Mechanical Engineers, Part G:

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The joined-wing aircraft is a very promising concept to reduce the ever-increasing fuel costs and CO 2 emissions. Joined-wing aircraft employ tandem wings having positive and negative sweep and dihedral, arranged to form diamond shapes in both plan and front views. This article evaluates its capabilities by establishing a comparison with respect to a reference conventional wing-plus-horizontal tail aircraft. Both airplanes are designed for the same medium-/long-range transport mission. The topics considered include structural arrangement, weights and aerodynamic characteristics, as well as operational issues, such as performance and direct operating costs. The conclusions drawn at the end of this preliminary study are very positive, but further research is required in order to confirm some hypotheses regarding the structural arrangement.

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Section: Joined-wing Aircraft Designmentioning

confidence: 74%

“…The research devoted to the feasibility and efficiency of the joined-wing design focuses on the rear fuselage-attached engines configuration [18,21,22]. The results of these works are not promising for the new configuration because the DOCs increase compared to conventional aircraft with engines attached to the rear fuselage.…”

Section: Introductionmentioning

confidence: 99%

Conceptual design of a medium-sized joined-wing aircraft

Cuerno-Rejado

Alonso-Albir

Gehse

2009

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Nowadays, attempts to design a joined wing airplane are more frequent, but in most cases researchers concentrate on the primary configuration of a joined wing airplane, with the front wing below the aft wing [3][4][5][6][7][8][9][10][11][12][13][14]. The previous experience of the authors [15] led to the conclusion that the joined wing airplane could fly much better in an upside down configuration.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of the Optimized Inverted Joined Wing Airplane Concept and Classical Configuration Airplanes

Sieradzki¹,

Dziubiński²,

Galiński³

2016

Archive of Mechanical Engineering

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The joined wing concept is an unconventional airplane configuration, known since the mid-twenties of the last century. It has several possible advantages, like reduction of the induced drag and weight due to the closed wing concept. The inverted joined wing variant is its rarely considered version, with the front wing being situated above the aft wing. The following paper presents a performance prediction of the recently optimized configuration of this airplane. Flight characteristics obtained numerically were compared with the performance of two classical configuration airplanes of similar category. Their computational fluid dynamics (CFD) models were created basing on available documentation, photographs and some inverse engineering methods. The analysis included simulations performed for a scale of 3-meter wingspan inverted joined wing demonstrator and also for real-scale manned airplanes. Therefore, the results of CFD calculations allowed us to assess the competitiveness of the presented concept, as compared to the most technologically advanced airplanes designed and manufactured to date. At the end of the paper, the areas where the inverted joined wing is better than conventional airplane were predicted and new research possibilities were described.

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“…They also noted additional DOC savings over conventional aircraft might be realized by decreasing the static margin of the joined wing. Similarly, they pointed out that close attention should be paid to the maximum lift coefficient attainable by the vehicle, because of the short tail moment arm resulting from the rear wing [16].…”

Section: -4mentioning

confidence: 99%

Structural Design of Wing Twist for Pitch Control of Joined Wing SensorCraft

Kimler¹

2006

11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

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This research investigated two aspects of the aft wing structure of a joined wing SensorCraft. First, the efficacy of a novel approach for incorporating wing twist for pitch control was analyzed. This design involved adding a spanwise sliding joint into the wing structure at the lower aft spar of the vehicle's aft wing. Second, the joint section where the forward and aft wings connect and form the outboard wing was redesigned and analyzed to improve the load transmission between the wing spars. Using MSC.NASTRAN, linear and non-linear static analyses were performed to examine the efficiency of the wing twist sliding joint and the forces required to achieve sufficient angular deflections for control. MSC.Patran was then used to perform post-processing of the raw data. Several variations of sliding joint location and composite ply angles were conducted. The sliding joint produced marked improvement in angular deflection over the baseline configuration. Surprisingly, however, ply angle did not have a large effect on the resulting deflections. Additional sliding joints incorporated into the wing structure produced no notable improvements in the obtained deflections either. Although the strain induced into the structure by the aft wing twist was on the order of the aerodynamic forces alone, the force required to twist the wing was significantly reduced by adding the slit in all cases. Flutter speed did not differ notably by the addition of the slit into the aft wing, yet some reduction in buckling strength was noted. The redesigned joint planform does appear to recover some of the buckling resistance lost due to the slit.

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Aerodynamic and structural studies of joined-wing aircraft

Cited by 49 publications

References 6 publications

Conceptual design of a medium-sized joined-wing aircraft

Conceptual design of a medium-sized joined-wing aircraft

Performance Comparison of the Optimized Inverted Joined Wing Airplane Concept and Classical Configuration Airplanes

Structural Design of Wing Twist for Pitch Control of Joined Wing SensorCraft

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