Results 71 to 80 of about 4,154,170 (239)
Modeling and simulation of one- and two-row six-bladed ducted fans
Научно-технический вестник информационных технологий, механики и оптикиThe problem of simulation of efficient ducted fan type propulsors is considered. From experience of operation of twin blades in fantails of helicopters, it is known that this configuration creates less noise compared to a uniform arrangement of the ...
S. Yu. Dudnikov +4 more
doaj +1 more source
Comparison of Far-Field Noise for Three Significantly Different Model Turbofans [PDF]
, 2008 Far-field noise sound power level (PWL) spectra and overall sound pressure level (OASPL) directivities were compared for three significantly different model fan stages which were tested in the NASA Glenn 9x15 Low Speed Wind Tunnel. The test fans included
Woodward, Richard P.
core +2 more sources
Lift–Thrust Integrated Ducted-Grid Fusion Configuration Design for a Ducted Fan Tail-Sitter UAV
Applied SciencesA new lift enhancement scheme is designed for the cruise flight process of a tail-sitter UAV (Unmanned Aerial Vehicle), proposing a fusion configuration with embedded grid channels on the duct wall. The low pressure zone at the lip of the duct is induced
Lei Liu, Baigang Mi
doaj +1 more source
Propulsion airframe integration [PDF]
Wind tunnel simulation tests are reported that utilize a 20 inch powered nacelle for airframe integration studies. Considered are: effects of boattail positioning, nacelle size, aft fuselage drag, over-the-wing half span model installation, and turboprop
Mikkelson, D.
core +1 more source
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2018 When developing counter-rotating fans for advanced aircraft engines with ducted blades (CRTF), it is very important to ensure high acoustic and aerodynamic characteristics. To provide investigations of aerodynamic and acoustic performance of the original
V. I. Mileshin +3 more
doaj +1 more source
Investigations of tip-jet and exhaust jet development in a ducted fan
Chinese Journal of Aeronautics, 2019 The major aim of this work is to investigate the tip-jet and exhaust jet development in a ducted fan as well as the impact on the fan’s performance. The flow field of the ducted fans under the solidity varied from 0.2 to 0.7 are simulated by using the ...
Lei Li, Guoping Huang, Jie Chen
semanticscholar +1 more source
A new blade element method for calculating the performance of high and intermediate solidity axial flow fans [PDF]
A method is presented to design and predict the performance of axial flow rotors operating in a duct. The same method is suitable for the design of ducted fans and open propellers.
Borst, H. V.
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Large scale wind tunnel investigation of a semispan wing equipped with an externally-blown jet flap [PDF]
A wind tunnel investigation was made of the aerodynamic characteristics of a 14.5 foot semispan, externally-blown jet flap model. The model was equipped with a single 30-inch diameter, ducted fan with a 1.03 pressure ratio.
Aiken, T. N., Falarski, M. D.
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Acoustic Power Transmission Through a Ducted Fan [PDF]
For high-speed ducted fans, when the rotor flowfield is shock-free, the main contribution to the inlet radiated acoustic power comes from the portion of the rotor stator interaction sound field that is transmitted upstream through the rotor.
Envia, Ed
core +1 more source
General Nonlinear Model of Reduced Scale UAVs [PDF]
, 2009 International audienceThis paper proposes, through a survey of models of several UAV-Structures, a generic nonlinear model for reduced scale aerial robotic vehicles (6 DOF) (Terms `light' and `reduced scale' implie that the flight range of aerial ...
Cheviron, Thaibault +2 more
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