Results 241 to 250 of about 9,942,018 (291)

Performance of synchronized fins in biomimetic propulsion

Bioinspiration & Biomimetics, 2015
By using a two-dimensional model of ray fins, we numerically investigate the thrust generation by closely-coupled fins with an immersed boundary approach. The concentration is on the performance enhancement through fin-fin interactions and the underlying vortex control mechanisms in three representative systems, a two-fin tandem configuration, a two ...
Kourosh, Shoele, Qiang, Zhu
openaire   +2 more sources

Fundamental Considerations in the Design and Performance Assessment of Propulsive Fuselage Aircraft Concepts [PDF]

Aeronautical Journal
Propulsive fuselage aircraft complement the two under-wing turbofans of current aircraft with an embedded propulsion system within the airframe to ingest the energy-rich fuselage boundary layer.
Ngonidzashe Mutangara, Drewan Sanders, Nicolas Moirou   +2 more
exaly   +2 more sources

Performance of flapping foil propulsion

Journal of Fluids and Structures, 2005
The performance of an aquatic propulsion system inspired from the thunniform swimming mode is experimentally studied. This consists of generating the propulsive force with a foil undergoing a harmonic flapping which is a combination of a heave translation and a pitch rotation. Experiments are performed at a fixed value of the Reynolds number and of the
Schouveiler, Lionel, Hover, F. S., Triantafyllou, M. S.   +2 more
openaire   +2 more sources

Propulsive Performances of Pulsed Detonations

Combustion Science and Technology, 1999
The propulsive potential of a reactive mixture that uses detonation as a combustion process is studied. An experimental set up is built up to determine the thrust and the impulse developed in single and multi-operating cycles by the detonation products of a reactive mixture contained in a cylindrical combustion chamber (CC).
R. ZITOUN, D. DESBORDES
openaire   +1 more source

Aero-Propulsive Coupling Performance and Design of Distributed Propulsion Wing

Chinese Journal of Aeronautics
Kelei Wang
exaly   +2 more sources

Influencing Factors on Propulsive Performances of Water Droplets for Laser Propulsion

Journal of Propulsion and Power, 2010
A transversely excited at atmospheric pressure CO 2 laser operated at 10.6 μm and 5 μs pulse width was employed to ablate atomized water droplets for laser propulsion. The momentum was derived from the force sensor data. Experimental results indicated that coupling coefficient C m , specific impulse I sp , and internal efficiency η were increased ...
Xiuqian Li, Yanji Hong, Ming Wen, Cunyan Cui, Guoqiang He   +4 more
openaire   +1 more source

Propulsion and aerodynamic performance evaluation of jet-wing distributed propulsion

Aerospace Science and Technology, 2010
Distributed propulsion is the idea of redistributing the thrust across the drag producing elements of a vehicle. Our configuration has a modest number of engines with part of the exhaust flow vented from thick trailing edges of the wings to cancel the local profile drag and the rest of the exhaust flow providing thrust to cancel the induced drag and ...
Joseph A. Schetz, Serhat Hosder, Vance Dippold, Jessica Walker   +3 more
openaire   +1 more source

Performance Matching of the Propulsion System

SAE Technical Paper Series, 1968
<div class="htmlview paragraph">The continuing requirement for weapon systems capable of efficient operation over a wide range of altitude, Mach number, and power setting emphasizes the importance of propulsion system off-design performance. This paper illustrates the effect of installation losses on this off-design performance and considers some
openaire   +1 more source

Prediction and Measurement of Propulsion System Performance

Journal of Engineering for Industry, 1974
The problem of predicting installed propulsion system performance for a specific configuration from isolated inlet, nozzle and airframe data, and from data for similar configurations is discussed. The degree to which element performance may be isolated from measurements made on an integrated propulsion system will be discussed.
Victor Salemann, John Postlewaite
openaire   +1 more source

Analysis of bionic hydrofoil propulsive performance

2011 IEEE International Conference on Mechatronics and Automation, 2011
Combined with the motion characteristics of turtles, a 2 degree-of-freedom periodic moving method is proposed for the single hydrofoil model of a hydrofoil propelled prototype. According to the hydrofoil hydrodynamic calculation formula, factors and motion parameters that affect thrust force produced by the hydrofoil are concluded.
Jian'an Xu, Na Yan, Mingjun Zhang
openaire   +1 more source