Results 91 to 100 of about 4,154,170 (239)

Flight and Interaction Control of an Innovative Ducted Fan Aerial Manipulator. [PDF]

Sensors (Basel), 2020
Zhang Y, Xu B, Xiang C, Fan W, Ai T.
europepmc   +1 more source

Evaluation of panel code predictions with experimental results of inlet performance for a 17-inch ducted prop/fab simulator operating at Mach 0.2 [PDF]

An axisymmetric panel code was used to evaluate a series of ducted propeller inlets. The inlets were tested in the Lewis 9 by 15 Foot Low Speed Wind Tunnel. Three basic inlets having ratios of shroud length to propeller diameter of 0.2, 0.4, and 0.5 were
Boldman, D. R., Hwang, D. P., Iek, C., Jeracki, R. J., Larkin, M., Sorin, G.   +5 more
core   +1 more source

Theoretical studies on tone noise from a ducted fan rotor [PDF]

The method of computing radiated noise from a ducted rotor due to inflow distortion and turbulence are examined. Analytical investigations include an appropriate description of sources, the cut-off conditions imposed on the modal propagation of the ...
Agarwal, R. K., Chu, W. T., Digumarthi, R. V., Rao, C. V. R.   +3 more
core   +1 more source

Static Aero-Propulsion Experiment of an Electric Ducted Fan

Aerospace
Electric ducted fans are gaining prominence in aviation due to their compact size, low noise, and zero emissions compared to conventional gas turbines. This study presents an experimental test system for a 390 mm electric Ducted Propulsion Fan developed ...
Hoang-Quan Chu, Quang-Ngoc Dinh, Thai-Son Vu, Van-Yen Pham, Van-Trung Bui, Nhat-Minh Hoang, Trung-Kien Nguyen, Dong Nguyen, Gia-Diem Pham, Cong-Truong Dinh   +9 more
doaj   +1 more source

Analysis of a HVAC zoning control system with an air-to-water heat pump and a ducted fan coil unit in residential buildings

Applied Thermal Engineering, 2022
Francisco Fernández Hernández, A. Atienza-Márquez, José Miguel Peña Suárez, Juan Antonio Bandera Cantalejo, Mari Carmen González Muriano   +4 more
semanticscholar   +1 more source

Time Optimal Altitude-Hold Flight Mode Transition Strategy for a Class of Ducted Fan Tail Sitter UAV

Aerospace
For special tail sitter configurations such as the ducted fan tail sitter unmanned aerial vehicle (UAV), the widely used trajectory planning methodology based on differential flatness might not be applicable due to complex aerodynamic coupling effects ...
Zihuan Cheng, Hailong Pei
doaj   +1 more source

Mathematical modeling of the reverse feeding system of a turbofan with ultra-high bypass ratio

Авіаційно-космічна техніка та технологія
This study investigates a ducted propfan in reverse mode, considering the influence of air bypass from outside the duct or air leakage after the propfan impeller.
Dmytro Plakushchyu, Mykhailo Mitrakhovych   +1 more
doaj   +1 more source

Development of a 32 Inch Diameter Levitated Ducted Fan Conceptual Design [PDF]

The NASA John H. Glenn Research Center has developed a revolutionary 32 in. diameter Levitated Ducted Fan (LDF) conceptual design. The objective of this work is to develop a viable non-contact propulsion system utilizing Halbach arrays for all-electric ...
Eichenberg, Dennis J., Gallo, Christopher a., Solano, Paul A., Thompson, William K., Vrnak, Daniel R.   +4 more
core   +1 more source

Response Surface Methodology-Driven Design Optimization for Ducted Fans

Aerospace
Due to the complexity of aerodynamic coupling between the duct and propeller, the overall design and optimization of ducted fans often require extensive experience and time.
Weijie Gong, Kaihua Fu, Hong Chen
doaj   +1 more source

Experimental Investigation on Hover Performance of a Ducted Coaxial-Rotor UAV. [PDF]

Sensors (Basel), 2023
Li H, Chen Z, Jia H.
europepmc   +1 more source