Results 1 to 10 of about 580 (166)
Applied Sciences (Switzerland), 2021 Rotor airfoil design involves multi-point and multi-objective complex constraints. How to significantly improve the maximum lift coefficient and lift-to-drag ratio of rotor airfoil is a fundamental problem, which should be solved urgently in the ...
Bifeng Song
exaly +3 more sources
An Improved Multi-Objective Particle Swarm Optimization Method for Rotor Airfoil Design
Aerospace, 2023 In this study, a multi-objective aerodynamic optimization is performed on the rotor airfoil via an improved MOPSO (multi-objective particle swarm optimization) method.
Gang Sun
exaly +3 more sources
In-Hover Aerodynamic Analysis of a Small Rotor with a Thin Circular-Arc Airfoil and a Convex Structure at Low Reynolds Number [PDF]
Micromachines, 2023 This study focused on the in-hover aerodynamics of a small rotor with a thin circular-arc airfoil and a convex structure at a low Reynolds number. The method combined computational fluid dynamics (CFD) with the blade element momentum theory (BEMT).
Yao Lei +3 more
doaj +2 more sources
Applied Sciences (Switzerland), 2020 The dynamic stall characteristics of rotor airfoil are researched by employing unsteady Reynolds-Averaged Navier-Stokes (RANS) method under oscillating freestream velocity conditions.
Qing Wang, Qijun Zhao
exaly +3 more sources
Hangkong gongcheng jinzhan, 2021 As the novel active flow control technology,Co-flow Jet concept(CFJ)is one of the most potential methods to achieve the high lift enhancement and drag reduction of rotor airfoil.Based on the OA 312 rotor airfoil,the CFJ rotor airfoil dynamometric model ...
ZHANG Shunlei +4 more
doaj +1 more source
Numerical Simulation of Helicopter Rotor Performance Degradation in Natural Rain Encounter
International Journal of Aerospace Engineering, 2021 Sustained flight operation in the rain conditions is still a challenge to a pilot. This problem can be mainly attributed to the aerodynamic performance degradation of aircraft.
Guozhi Li, Yihua Cao
doaj +1 more source
Experimental Study on Dynamic Stall of Airfoil in Rotor Reverse Flow Region
Aerospace, 2023 The large reverse flow region of the rotor with a high advance ratio is an important factor that affects the performance improvement of helicopters. This paper examines the dynamic stall of the airfoil in the reverse flow region of the rotor to develop a
Weihong Kong, You Li
doaj +1 more source
Fluids, 2021 The present paper aims to study the possibility of dispensing an auxiliary power unit (APU) in an aircraft powered by fossil fuels to reduce air pollution. It particularly seeks to evaluate the amount of power generated by the ram air turbine (RAT) using
Magedi Moh M. Saad +4 more
doaj +1 more source
Design of advanced airfoil for stall-regulated wind turbines [PDF]
Wind Energy Science, 2017 Nowadays, all the modern megawatt-class wind turbines make use of pitch control to optimise the rotor performance and control the turbine. However, for kilowatt-range machines, stall-regulated solutions are still attractive and largely used for their ...
F. Grasso +3 more
doaj +1 more source
Machine Learning Assisted Prediction of Airfoil Lift-to-Drag Characteristics for Mars Helicopter
Aerospace, 2023 The aerodynamic properties of rotor systems operating within low Reynolds number flow field conditions are profoundly influenced by their geometric and flight parameters.
Pengyue Zhao +5 more
doaj +1 more source