Tiltrotor CFD part I: validation [PDF]
, 2017 This paper presents performance analyses of the model-scale ERICA and TILTAERO tiltrotors and of the full-scale XV-15 rotor with high-fidelity computational fluids dynamics.
Barakos, George N. +2 more
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Numerical Simulation of Helicopter Blade Bullet Penetration in Maneuvering State
Hangkong gongcheng jinzhan, 2019 The study on the impact damage of helicopter rotor blade under maneuvering condition is of important significance. Based on the rotor blade of a certain type of machine, a numerical simulation method of projectile attack on the rotor blade under the ...
Lin Changliang, Zhu Yuefa, Hu Wengang
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A comparison of coaxial and conventional rotor performance [PDF]
, 2009 The performance of a coaxial rotor in hover, in steady forward flight, and in level, coordinated turns is contrasted with that of an equivalent, conventional rotor with the same overall solidity, number of blades, and blade aerodynamic properties.
Brown, Brown, Kim, Landgrebe, Newman
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Lift distribution and velocity field measurements for a three-dimensional, steady blade/vortex interaction [PDF]
A wind tunnel experiment simulating a steady three-dimensional helicopter rotor blade/vortex interaction is reported. The experimental configuration consisted of a vertical semispan vortex-generating wing, mounted upstream of a horizontal semispan rotor ...
Dunagan, Stephen E., Norman, Thomas R.
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The effect of helicopter configuration on the fluid dynamics of brownout [PDF]
, 2008 Brown’s Vorticity Transport Model, coupled to an additional particle transport model, is used to simulate the development of the dust cloud that can form around a helicopter when operating in dusty or desert conditions.
Brown, R., Phillips, C.
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Effects of nonuniform swash-plate stiffness on coupled blade-control system dynamics and stability [PDF]
, 1972 Program has been developed that analytically determines effects of nonuniform swash-plate support stiffness, swash-plate flexibility, and out-of-blade track on vibratory mechanical stability characteristics of helicopter rotor systems.
Piarulli, V. J.
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Tiltrotor CFD part II: aerodynamic optimisation of tiltrotor blades [PDF]
, 2017 This paper presents aerodynamic optimisation of tiltrotor blades with high-fidelity computational fluid dynamics. The employed optimisation framework is based on a quasi-Newton method, and the required high-fidelity flow gradients were computed using a
Barakos, G.N. +5 more
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An unsteady helicopter rotor: Fuselage interaction analysis [PDF]
A computational method was developed to treat unsteady aerodynamic interactions between a helicopter rotor, wake, and fuselage and between the main and tail rotors.
Egolf, T. Alan, Lorber, Peter F.
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DETERMINATION OF OPTIMAL AZIMUTH FOR MOUNTING ULTRALIGHT COAXIAL HELICOPTER BLADES
Advanced Engineering Research, 2011 The possibility of reducing vibration of the ultralight coaxial helicopter blades on the through harmonic wave by mounting blades on the optimal azimuth is shown.
Vitaly V. Dudnik, Vladimir A. Kolot
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Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor [PDF]
The reduction of high speed impulsive noise for the UH-1H helicopter was investigated by using an advanced main rotor system. The advanced rotor system had a tapered blade planform compared with the rectangular planform of the standard rotor system ...
Conner, D. A., Hoad, D. R.
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