Results 1 to 10 of about 7,767,476 (330)
Helicopter Main Rotor Blade Parametric Design for a Preliminary Aerodynamic Analysis Supported by CFD or Panel Method. [PDF]
Materials (Basel), 2022 This work is the preliminary part of a research program which is aimed at finding some new methods and design solutions for helicopter main rotor multidisciplinary optimization.
Kocjan J, Kachel S, Rogólski R.
europepmc +4 more sources
CAA modeling of helicopter main rotor in hover [PDF]
EPJ Web of Conferences, 2017 In this work rotor aeroacoustics in hover is considered. Farfield observers are used and the nearfield flow parameters are obtained using the in house HMB and commercial Fluent CFD codes (identical hexa-grids are used for both solvers). Farfield noise at
Kusyumov Alexander N. +4 more
doaj +4 more sources
Main rotor-tail rotor intraction and its implications for helicopter directional control [PDF]
Journal of the American Helicopter Society, 2008 Aerodynamic interference between the main and tail rotor can have a strong negative influence on the flight mechanics of a conventional helicopter. Significant unsteadiness in the tail rotor loading is encountered under certain flight conditions, but the
Brown, R.E., Fletcher, Timothy M.
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Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight [PDF]
Journal of Aircraft, 2010 The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor
Balch D. T. +9 more
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Variable-speed tail rotors for helicopters with variable-speed main rotors [PDF]
The Aeronautical Journal, 2017 Variable tail rotor speed is investigated as a method for reducing tail rotor power, and improving helicopter performance. A helicopter model able to predict the main rotor and tail rotor powers is presented, and the flight test data of the UH-60A ...
Barakos, G.N., Han, D.
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Experimental investigation of main rotor wake [PDF]
MATEC Web of Conferences, 2017 In this work, experimental results of rotor wake in hover mode are presented. The experiments were carried out with a rotor rig model in the T-1K wind tunnel in Kazan National Research Technical University (Kazan Aviation Institute).
Stepanov Robert, Mikhailov Sergey
doaj +2 more sources
Main Rotor Wake Interference Effects on Tail Rotor Thrust in Crosswind
International Journal of Aerospace Engineering, 2021 Reverse pedal operational property in front crosswind flight condition is a potential hazard for accidents involving loss of tail rotor effectiveness (LTE), which is closely related to the main rotor (MR) wake interference on the tail rotor (TR).
Chang Wang +4 more
doaj +2 more sources
Известия высших учебных заведений России: Радиоэлектроника, 2019 Introduction. The basis for solving the problem of aircraft recognition is the formation of radar portraits, reflecting the constructive features of aerial vehicles.
Sergey R. Heister, Thai T. Nguyn
doaj +2 more sources
Aeroacoustic analysis of main rotor and tail rotor interaction [PDF]
, 2008 The increased restrictions placed on helicopter noise levels over recent decades have encouraged manufacturers to better understand tail rotor noise and its aerodynamic sources.
Brown, R.E. +2 more
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Exploring the Detached-Eddy Simulation for Main Rotor Flows [PDF]
Russian Aeronautics, 2018 This paper applies the Detached-Eddy Simulation (DES) method to resolve a larger part of the flow spectrum around rotor blades in hover and forward flight. A comparison between DES and Unsteady Reynolds–Averaged Navier–Stokes simulation was carried out for the case of a forward flying rotor suggesting that DES has great potential for rotor applications.
F. Dehaeze +4 more
semanticscholar +2 more sources