The Effect of Autoignition-promoting Additives on Deflagration-to-detonation Transition PDF Download
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Author: B. Hitch
Publisher:
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Category :
Languages : en
Pages :
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Author: B. Hitch
Publisher:
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Category :
Languages : en
Pages :
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Author:
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Category : Airplanes
Languages : en
Pages : 506
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Author: Pierre Francois Pinard
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
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"Renewed interest in pulse detonation engines has focused attention on the problem of deflagration to detonation transition (DDT) in fuel-air mixtures. A prohibitively large deposition of energy is required for direct initiation of higher-hydrocarbon fuels in air. Consequently, methods are being sought to reduce the run-up distance required for DDT. It has been proposed that the addition of a very sensitive fuel, or of nitrate-based sensitizers typically used in diesel fuels, could increase the sensitivity of hydrocarbon fuel-air mixtures by increasing the chemical kinetic rates. Studies have indicated that the effect of nitrates on diesel fuels occurs through the action of nitrogen dioxide (NO2) abstracted from the nitrate molecule." --
Author:
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Category : Airplanes
Languages : en
Pages : 546
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Author: Daniel E. Paxson
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Category :
Languages : en
Pages : 12
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Author: Daniel E. Paxson
Publisher: BiblioGov
ISBN: 9781289167028
Category :
Languages : en
Pages : 22
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A sub-model is developed to account for the drag and heat transfer enhancement resulting from deflagration-to-detonation (DDT) inducing obstacles commonly used in pulse detonation engines (PDE). The sub-model is incorporated as a source term in a time-accurate, quasi-onedimensional, CFD-based PDE simulation. The simulation and sub-model are then validated through comparison with a particular experiment in which limited DDT obstacle parameters were varied. The simulation is then used to examine the relative contributions from drag and heat transfer to the reduced thrust which is observed. It is found that heat transfer is far more significant than aerodynamic drag in this particular experiment.
Author: Darren Dale Radford
Publisher:
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Category :
Languages : en
Pages : 0
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781794371569
Category : Science
Languages : en
Pages : 34
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A sub-model is developed to account for the drag and heat transfer enhancement resulting from deflagration-to-detonation (DDT) inducing obstacles commonly used in pulse detonation engines (PDE). The sub-model is incorporated as a source term in a time-accurate, quasi-onedimensional, CFD-based PDE simulation. The simulation and sub-model are then validated through comparison with a particular experiment in which limited DDT obstacle parameters were varied. The simulation is then used to examine the relative contributions from drag and heat transfer to the reduced thrust which is observed. It is found that heat transfer is far more significant than aerodynamic drag in this particular experiment. Paxson, Daniel E. and Schauer, Frederick and Hopper, David Glenn Research Center NASA/TM-2012-217629, AIAA Paper 2009-502, E-18219
Author: Bernard Terry Wolfson
Publisher:
ISBN:
Category : Explosions
Languages : en
Pages : 0
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 724
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