Results 201 to 210 of about 46,180 (252)
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Laser and Photonics Reviews, 2010
AbstractAfter an introduction illustrating the relevance and motivation of laser ignition of engines, the physical background is reviewed in a first technical section. This mainly comprises the mechanisms of plasma formation, which are the generation of first free electrons and their avalanche‐like multiplication, being illustrated by emission and ...
H Kofler
exaly +2 more sources
AbstractAfter an introduction illustrating the relevance and motivation of laser ignition of engines, the physical background is reviewed in a first technical section. This mainly comprises the mechanisms of plasma formation, which are the generation of first free electrons and their avalanche‐like multiplication, being illustrated by emission and ...
H Kofler
exaly +2 more sources
Laser Ignition of Combustion Engines: Development of an Ignition Laser
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007Summary form only given. This work focuses on the development of a compact, robust and reliable Nd:YAG solid-state laser. A diagram for the pulse energy in dependence of the reflectivity of the output mirror and the initial transmission of the absorber, as well as the analysis of inject optics and optimum pump duration is established. The highest pulse
J. Tauer +3 more
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Laser ignition of nanocomposite thermites
Combustion and Flame, 2004Abstract Laser ignition experiments were performed to determine the ignition time of nanoscale particle diameter composites of aluminum (Al) and molybdenum trioxide (MoO3). Ignition time and burn rate were measured as a function of stoichiometry and also as a function of Al particle diameter, which ranged from 17.4 nm to 20 μm.
Michelle L Pantoya
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Laser ignition of explosives: Effects of laser wavelength on the threshold ignition energy
Journal of Energetic Materials, 1994Abstract A method, based on a tunable 180 W CW CO2-laser (9–11 μm), for measuring the effect of laser wavelength, and hence optical absorbance coefficient, on the threshold ignition energy of explosives, has been developed. To determine how the laser beam interacts with the high explosives, a theory for the connection between the ignition energy and ...
Henric Östmark +2 more
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SPIE Proceedings, 2006
Nowadays, combustion engines and other combustion processes play an overwhelming and important role in everyday life. As a result, ignition of combustion processes is of great importance, too. Usually, ignition of a combustible material is defined in such a way that an ignition initiates a self-sustained reaction which propagates through the ...
G. Liedl +8 more
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Nowadays, combustion engines and other combustion processes play an overwhelming and important role in everyday life. As a result, ignition of combustion processes is of great importance, too. Usually, ignition of a combustible material is defined in such a way that an ignition initiates a self-sustained reaction which propagates through the ...
G. Liedl +8 more
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Nature Photonics, 2008
The pollutant emissions and high-energy consumption of combustion engines using conventional spark plugs have long been serious environmental problems. Now, it has been demonstrated that lasers can provide a feasible green alternative. Duncan Graham-Rowe reports.
Duncan Graham-Rowe, Rachel Won
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The pollutant emissions and high-energy consumption of combustion engines using conventional spark plugs have long been serious environmental problems. Now, it has been demonstrated that lasers can provide a feasible green alternative. Duncan Graham-Rowe reports.
Duncan Graham-Rowe, Rachel Won
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Laser ignition of pyrotechnic mixtures: Ignition mechanisms
Journal of Applied Physics, 1993A laser method for studying the ignition processes of a pyrotechnic mixture is presented. The experimental equipment consists mainly of a 250 W CO2 laser, an explosive chamber, a power meter, and a mechanical shutter. Using the laser ignition apparatus a parametrical study of the ignitability of a pyrotechnic mixture (Mg/NaNO3) was conducted.
Henric Östmark, Nils Roman
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Numerical Simulation of Laser Ignition of Rocket Fuels in Igniters
44th AIAA Thermophysics Conference, 2013n the nearest future, the space industry will try to reduce the Earth-to-orbit transportation cost by employing multiple-use Liquid Rocket Engines (LRE) in launch vehicles and multiple-start-up low-thrust LRE in spacecrafts. This demand from new generation of rocket engines multiplicity in use and providing several starting of engine.
Sergey Rebrov +2 more
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Ignition Overpressure in Laser Ignited Reaction and Control Thrusters
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2014Advanced ignition systems have been subject of great interest due to the need of developing a new generation of ignition systems for alternative propellant combinations for reaction and control system (RCS) and orbital and manoeuvring system (OMS) thrusters which move away from the classic but toxic hypergolic propellants monomethylhydrazine (MMH) and ...
Manfletti, C., Börner, Michael
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Minimum ignition energy for laser spark ignition
Proceedings of the Combustion Institute, 2005Abstract Combustion ignition by electrical sparks and nonresonant laser sparks is preceded by breakdown, electron heating, relaxation of internal plasma energy, shock wave generation and propagation, and subsonic flows. Measurements and model calculations of these processes (which occur over times of 10 −12 –10 −1 s) in laser sparks show that the ...
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