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Accession Number
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ADA560399
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Title
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Trajectory, Development, and Temperature of Spark Kernels Exiting into Quiescent Air (Preprint).
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Publication Date
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Apr 2012
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Media Count
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14p
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Personal Author
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B. V. Kiel D. L. Blunck
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Abstract
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An inverse deconvolution technique was developed to determine the temperature and sensible energy of the kernels. This technique is evaluated by a sensitivity analysis and comparisons to measurements on a well characterized flame. Infrared images show that the kernels develop into a toroidal shape after exiting from the igniter. The statistical distribution of the trajectory of spark kernels is symmetric. Buoyancy forces have a negligible effect on the trajectory. Regions of high and low radiation intensity are observed in the kernels, indicating temperature gradients within the gases. The radiation intensity emitted by spark kernels decreases by more than an order of magnitude after exiting the igniter. Average temperature values decrease by less than 30% over 2 cm of the spark trajectory. Over that distance the sensible energy of the kernel decreases by 80%.
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Keywords
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Combustion
Dynamic stability
Electric igniters
Flame holders
Gas turbine propulsion
Gas turbines
Plasma generators
Pulsed plasma jet igniters
Screech
Spark kernels
Sparks
Thermochemical propulsion
Trajectories
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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46B - Fluid Mechanics
46G - Plasma Physics
81A - Combustion & Ignition
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Corporate Author
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Air Force Research Lab., Wright-Patterson AFB, OH. Turbine Engine Div.
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Document Type
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Technical report
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Title Note
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Technical rept. 1 Apr 2010-1 Apr 2012.
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NTIS Issue Number
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1221
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Contract Number
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N/A
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