Results 41 to 50 of about 4,154,170 (239)
Acceleration Schedule of Air‑Driving Ducted Fan Propulsion System
Nanjing Hangkong Hangtian Daxue XuebaoThe air-driving ducted fan propulsion system is a new design for vertical takeoff and landing power systems which consists of a turbofan engine and an air-driving ducted fan. The air-driving ducted fan is driven by the air intake of the turbofan’s bypass，
LEI Junhao, HUANG Xianghua
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ITM Web of Conferences, 2018 In this article, capacity and acoustics parameters of low pressure ducted axial fan is numerically investigated with Realizable k-epsilon, k-w SST and DES turbulence models by using computational fluid dynamics software. One slice of six bladed axial fan
Bacak Aykut, Pinarbasi Ali
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Suppression of broadband noise radiated by a low-speed fan in a duct [PDF]
, 2010 Attenuation of ducted fan noise remains a technical challenge in the low frequency range as traditional duct lining becomes ineffective. This study proposes a reactive method to suppress the sound radiation from an axial-flow fan.
Feng, LG, Huang, L, Ma, X
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A Moore-Greitzer Model for Ducted Fans in Ground Effect
Journal of Applied Fluid Mechanics, 2020 Ducted fans are widely used in unmanned aerial vehicles due to their high propulsive efficiency and safety. The aerodynamics are complex within the vicinity of the ground, including take-off, landing and hovering.
Y. Jin, Y. Fu, Y. Qian, Y. Zhang
doaj
IEEE Access, 2020 In this paper, we focus on the transition control of a ducted fan vertical take-off and landing (VTOL) unmanned aerial vehicle (UAV). To achieve a steady transition from hover to high-speed flight, a neural-networks-based controller is proposed to learn ...
Zihuan Cheng, Hailong Pei, Shuai Li
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Investigation of the Tip Clearance Effect in a Counter-rotating Ducted Fan for VTOL UAV [PDF]
, 2014 The tip clearance effect on counter-rotating ducted fan of VTOL UAV in hovering condition, was investigate using computational analysis. The numerical results of baseline model are validated by wind tunnel test in hovering and forward conditions.
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Experimental investigation on ducted counter-rotating axial flow fans [PDF]
, 2011 An experimental study on counter-rotating axial-flow fans was carried out. The fans of diameter D = 375 mm were designed using an inverse method. The counter-rotating fans operate in a ducted-flow configuration and the overall performances are measured ...
BAKIR, Farid +3 more
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A Modular 3D-Printed Ducted-Fan Platform for Advanced Autonomy Research: From Design to Flight Test
DronesFollowing the growing interest in small-scale unmanned aerial vehicles (UAVs), this paper presents a comprehensive conceptual design methodology for a modular ducted-fan aerial vehicle intended for research applications.
Andrea Dan Ryals +5 more
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Linear Parameter-Varying Control of a Ducted Fan Engine [PDF]
, 1995 Parameter-dependent control techniques are applied to a vectored thrust, ducted fan engine. The synthesis technique is based on the solution of Linear Matrix Inequalities and produces a controller which achieves specified performance against the worst ...
Bendotti, Pascale +2 more
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Aerospace, 2023 The aerodynamic performances and control characteristics of vertical takeoff and landing aircraft will be significantly affected by the ground effect during takeoff and landing.
Yanxiong Zhao, Yun Tian, Zhiqiang Wan
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