45 research outputs found

    Transient Plasma Ignition of Hydrocarbon-Air Mixtures

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    42nd AIAA Aerospace Sciences Meeting and Exhibit AIAA 2004-834 5 - 8 January 2004, Reno, NevadaThe article of record as published may be found at http://dx.doi.org10.2514/6.2004-834A transient plasma ignition system has been demonstrated to substantially reduce the ignition delay and detonation-to-detonation transition times for ethylene-air and propane-air mixtures under dynamic fill conditions. The effects initial conditions including equivalence ratio, a temperature range of 280K to 430K, and pressure range of 1 to 6 atm were evaluated. Ignition delays were reduced by up to a factor of 5 and the correspondingdeflagration-to-detonationtime scales were observed to decrease accordingly when compared to conventional capacitive dischargesystems. Thesubstantialreductionoftheignitiondelaytimesresultedinthegeneration of strong pressure waves which inherently steepened into shock waves quickly and in a short distance. Although direct initiation of a detonation wave was not obtained, the sub sequential use of a Shchelkin spiral was able to rapidly and reliably accelerate the combustion driven shock waves to detonations within practical distances. The efficiency and performance of the transient plasma ignition strategy will likely contribute to the development of fuel-air detonation initiators

    The Sample Analysis at Mars Investigation and Instrument Suite

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    STUDIES OF THE BASIC PROCESSES RESPONSIBLE FOR LASER-TRIGGERED BREAKDOWN IN GASES

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    A number of technologically important applications require high voltage, high current switches which operate with low delay and jitter in the closure time. Laser-triggered spark gaps offer significant advantages for use in these applications in that the switching of 50 kV with a delay in the range of 3.0 ns. and jitter in the 0.1 ns. range has been demonstrated.1 In this paper some experimental studies intended to elucidate the basic physical processes important in such devices are described

    Compact Pulsed-Power System for Transient Plasma Ignition

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