Results 21 to 30 of about 1,422,313 (180)
TASK Quarterly, 2015 The paper presents the results of a numerical simulation of the flow and acoustic field generated by the PZL W3-A “Sokół” (Falcon) helicopter main rotor in high-speed forward flight conditions based on the URANS approach and the chimera overlapping ...
OSKAR SZULC +4 more
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Modelling the helicopter rotor aerodynamics at forward flight with free wake model and URANS method
Aviation, 2020 The presented work is dedicated to the numerical study of the aerodynamic characteristics of the helicopter rotor. Two approaches to modeling of the rotor are applied: the free wake model developed by the Authors with using steady airfoil characteristics
Yuri Ignatkin +3 more
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Propeller ground and ceiling effect in forward flight
, 2022 Click on the DOI link to access this article at the publishers website (may not be free).The study of the fixed-pitch small-scale propeller in ground/ceiling effect is extended to forward flight conditions.
Cai, Jielong, Gunasekaran, Sidaard
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A Numerical Study of the Sound and Force Production of Flexible Insect Wings
Fluids, 2018 We numerically solved the acoustic and flow field around cicada wing models with parametrically varied flexibility using the hydrodynamic/acoustic splitting method. We observed a gradual change of sound directivity with flexibility.
Biao Geng +4 more
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Mathematical modeling and investigating the effect of the area of the horizontal stabilizer on the stability of a single-main-rotor helicopter in forward flight [PDF]
مجله مدل سازی در مهندسی, 2019 This paper investigates the effect of the area of the horizontal stabilizer of a single-main-rotor helicopter on its dynamic responses, stability properties, and flight handling quality during forward flights.
Fatemeh Ghaderi, Farid Shahmiri
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Optimised Tuning of a PID-Based Flight Controller for a Medium-Scale Rotorcraft
Algorithms, 2021 This paper presents the parameter optimisation of the flight control system of a singlerotor medium-scale rotorcraft. The six degrees-of-freedom (DOF) nonlinear mathematical model of the rotorcraft is developed.
Lindokuhle J. Mpanza +1 more
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Safety, 2022 Helicopters are more and more widely used for water dumping in fire extinguishing operations nowadays. Increasing attention is being paid to improving helicopter firefighting efficiency.
Tejun Zhou +3 more
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Flight test: Supporting the investigation of factors affecting loss of control of light aircraft [PDF]
, 2009 A quarter of all fatal General Aviation accidents in the UK during the period 1980 to 2006 involved Loss of Control (LoC) in Visual Meteorological Conditions (VMC).
Gratton, GB, Bromfield, MA
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Aerodynamic analysis of toroidal propellers in forward flight [PDF]
INCAS BulletinResearch is being conducted to develop a new generation of propellers that can enable quieter and more efficient flight. One promising development in this area are Toroidal propellers, for which the blades are shaped as a closed loop.
Oliviu SUGAR-GABOR +2 more
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Transient Thrust Analysis of Rigid Rotors in Forward Flight
Aerospace, 2022 The purpose of this study was to investigate and quantify the transient thrust response of two small rigid rotors in forward flight. This was accomplished using a distributed doublet-based potential flow method, which was validated against wind-tunnel ...
Travis Krebs +2 more
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