Effects of an Image Plane on the Tiltrotor Fountain Flow

Polak, David R.; Rehm, W.; George, A. R.

doi:10.4050/jahs.45.90

Cited by 23 publications

(16 citation statements)

References 14 publications

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“…Some differences with respect to the full-scale aircraft are, in principle, expected due to Mach number effects as well as to Reynolds number effects but several previous works (e.g., (Refs. 6,8,11,33)) suggest that the behavior of the rotor wake flow is essentially the same at smaller scale. Although the M tip and Re tip numbers on the model (0.32 and 9.87 × 10 5 , respectively) were lower with respect to the full-scale aircraft (0.64 and 7.89 × 10 6 , respectively), these differences were on the order of those discussed by Polak and George (Ref.…”

Section: Rotor Operating Conditionsmentioning

confidence: 91%

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Aerodynamic Interaction between Rotor and Tilting Wing in Hovering Flight Condition

Droandi¹,

Zanotti²,

Gibertini³

2015

j am helicopter soc

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The hovering performance and the lifting capability of tiltrotor aircraft are strongly affected by the aerodynamic interaction between wing and rotors. The tiltwing concept represents an interesting technology to increase the hover performance by reducing the wing-rotor interference. The present work investigates the aerodynamic interaction between wing and rotor in hover for a scaled tiltwing aircraft half-span model. A comprehensive experimental campaign, including force measurements and particle image velocimetry surveys, was performed together with computational fluid dynamics simulations. Numerical predictions were validated using experimental data and were used to describe the flow field. Nomenclature

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Section: Rotor Operating Conditionsmentioning

confidence: 91%

“…5) and rotor-rotor (Ref. 6) interactions remains. The use of large rotors also has other important consequences for tiltrotor aircraft.…”

Section: Introductionmentioning

confidence: 96%

Aerodynamic Interaction between Rotor and Tilting Wing in Hovering Flight Condition

Droandi¹,

Zanotti²,

Gibertini³

2015

j am helicopter soc

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“…The tip Mach number was M tip = 0•32 which correspond to half the tip Mach number of a full-scale aircraft at design point in hover. The authors are aware that some differences with respect to full-scale can, in principle, be expected due to Mach number effects (as well as to Reynolds number effects) but several previous works published by other authors (3,4,10,19) support the idea that the behaviour of the rotor wake flow is essentially the same.…”

Section: Test Results and Discussionmentioning

confidence: 97%

“…Forces and moments on the wing were measured by a six-component strain gauge balance located at the wing root. A square image plane with 2·2R side is positioned at the fixed wing root to restore the symmetry condition on the symmetry plane of the model (8,10) . The image plane is fixed on the support of the wing traversing system.…”

Section: Sectionmentioning

confidence: 99%

“…Moreover, when the rotor wake impinges on the wing surface a download force, that is approximately 10%-15% of the rotor thrust (4,8) , is generated. In order to overcome these limitations in the actual tiltrotors (XV-15, V-22 Osprey and BA609) large rotors were adopted, although this solution increased the aerodynamic interference due to wing-rotor (9) and rotor-rotor (10) interaction. Moreover, large rotors prevent the take-off and landing in aircraft flight mode and lead to important limitations in cruise flight, such as the maximum cruise speed achieved and the operative range, which is limited by a relevant fuel consumption.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the rotor-wing aerodynamic interaction in a tiltwing aircraft in hover

et al. 2015

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The hovering performance and the lifting capability of tiltrotor aircraft are strongly affected by the aerodynamic interaction between wing and rotors. The tiltwing concept represents a promising technology to increase the hover performance by reducing the wing-rotor interference. The present work describes an experimental activity carried out on a ¼ scaled tiltwing aircraft half-model to achieve a detailed insight about the main issues characterising the aerodynamic interaction between wing and rotor in hover. The results of the experimental campaign, including both force measurements and Particle Image Velocimetry surveys, enabled to evaluate both the aircraft performance for different configurations of the tilting wing and to achieve a detailed insight about the flow physics of the rotor wake in the interaction with the wing. The test activity provided a comprehensive experimental database that was obtained over a not confidential aircraft configuration.

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Proprotor–wing aerodynamic interaction in the first stages of conversion from helicopter to aeroplane mode

Droandi

Gibertini

Grassi

et al. 2016

Aerospace Science and Technology

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Effects of an Image Plane on the Tiltrotor Fountain Flow

Cited by 23 publications

References 14 publications

Aerodynamic Interaction between Rotor and Tilting Wing in Hovering Flight Condition

Aerodynamic Interaction between Rotor and Tilting Wing in Hovering Flight Condition

Experimental investigation of the rotor-wing aerodynamic interaction in a tiltwing aircraft in hover

Proprotor–wing aerodynamic interaction in the first stages of conversion from helicopter to aeroplane mode

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