Results 261 to 270 of about 33,101 (293)
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Numerical Prediction of Thruster-Thruster Interaction
Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B, 2009Many vessels deploying offshore activities nowadays are dynamically positioned by multiple azimuth thrusters instead of anchors. The multiple propulsor set up, gives a considerable flexibility to work fast and accurate. Due to the fact that the thrusters are positioned relative close to one another their performance is influenced.
R. Bosland +2 more
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Directional acoustic underwater thruster
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2011This study describes a tested prototype for a controllable directional underwater thruster with no moving parts. During operation, a high-intensity acoustic wave creates directional water jets and the device moves itself in the opposite direction. When the underwater thruster moves along a non-vertical angle, it can produce straight backward thrust of ...
Wang, Ziyu +7 more
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Stationary plasma thruster simulation
Computer Physics Communications, 2004Abstract A two-dimensional in space and three-dimensional in velocity, fully kinetic particle-in-cell (PIC) model of the atom (Xe), ion (Xe+) and electron dynamics of a stationary plasma thruster is developed. Electron-neutral elastic scattering, excitation and ionization processes are modelled by Monte Carlo collision methodology. The interaction of
FTaccogna +3 more
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15th International Electric Propulsion, 1981
Some recent advances in component technology for inert gas thrusters are described. The maximum electron emission of a hollow cathode with argon can be increased 60-70% by the use of an enclosed keeper configuration. Operation with argon, but without emissive oxide, has also been obtained.
Harold R. Kaufman +2 more
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Some recent advances in component technology for inert gas thrusters are described. The maximum electron emission of a hollow cathode with argon can be increased 60-70% by the use of an enclosed keeper configuration. Operation with argon, but without emissive oxide, has also been obtained.
Harold R. Kaufman +2 more
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Journal of Propulsion and Power, 1998
The 35-year history of the development and application of the pulsed plasma thruster (PPT) is reviewed. The PPT operates by creating a pulsed, high-current discharge across the exposed surface of a solid insulator, such as a Tee on t bar. The arc discharge ablates material from this surface, thereby providing propellant that is ionized, heated, and ...
R. L. Burton, P. J. Turchi
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The 35-year history of the development and application of the pulsed plasma thruster (PPT) is reviewed. The PPT operates by creating a pulsed, high-current discharge across the exposed surface of a solid insulator, such as a Tee on t bar. The arc discharge ablates material from this surface, thereby providing propellant that is ionized, heated, and ...
R. L. Burton, P. J. Turchi
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Magnetoplasmadynamic thruster development
16th International Electric Propulsion Conference, 1982Current research on self-field MPD thrusters presents the possibility of developing high power/low cost electric propulsion. The interest generated in this propulsion concept within both NASA and the U.S. Air Force has led to a coordinated interagency effort, and the recent completion of several test sites are expected to speed thruster concept ...
E. PAWLIK, R. VONDRA
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43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2007
[Abstract] An experimental electric thruster has been built in which power is supplied via Electron-Cyclotron Resonance (ECR) absorption of microwaves by the propellant gas. The plasma is confined radially by an axial dc magnetic field applied through a series of water-cooled coils around the resonance chamber.
Jerome Brainerd, Al Reisz
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[Abstract] An experimental electric thruster has been built in which power is supplied via Electron-Cyclotron Resonance (ECR) absorption of microwaves by the propellant gas. The plasma is confined radially by an axial dc magnetic field applied through a series of water-cooled coils around the resonance chamber.
Jerome Brainerd, Al Reisz
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2013 IEEE 25th Symposium on Fusion Engineering (SOFE), 2013
The Flux-Coil-Generated, Field-Reversed Configuration Experiment (FCX) at Tri Alpha Energy, Inc. (TAE) requires an initial source of plasma, from which the FRC is formed. This paper details the design, simulation, and performance measured for a new set of PITs developed for the FCX.
F. J. Wessel +5 more
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The Flux-Coil-Generated, Field-Reversed Configuration Experiment (FCX) at Tri Alpha Energy, Inc. (TAE) requires an initial source of plasma, from which the FRC is formed. This paper details the design, simulation, and performance measured for a new set of PITs developed for the FCX.
F. J. Wessel +5 more
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Conference on Advanced SEI Technologies, 1991
MPD (MagnetoPlasmaDynamic) thrusters demonstrated between 2000 and 7000 seconds specific impulse at efficiencies approaching 40 percent, and were operated continuously at power levels over 500 kW. These demonstrated capabilities, combined with the simplicity and robustness of the thruster, make them attractive candidates for application to both ...
ROGER MYERS +2 more
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MPD (MagnetoPlasmaDynamic) thrusters demonstrated between 2000 and 7000 seconds specific impulse at efficiencies approaching 40 percent, and were operated continuously at power levels over 500 kW. These demonstrated capabilities, combined with the simplicity and robustness of the thruster, make them attractive candidates for application to both ...
ROGER MYERS +2 more
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Physics of Plasmas, 2015
A new scheme of plasma thruster is proposed. It is based on axial acceleration of rotating magnetized plasmas in magnetic field with helical corrugation. The idea is that the propellant ionization zone can be placed into the local magnetic well, so that initially the ions are trapped.
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A new scheme of plasma thruster is proposed. It is based on axial acceleration of rotating magnetized plasmas in magnetic field with helical corrugation. The idea is that the propellant ionization zone can be placed into the local magnetic well, so that initially the ions are trapped.
openaire +1 more source