Gas-particle interaction in detonation spraying systems |
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Authors: | E Kadyrov |
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Affiliation: | (1) Materials Science Program, University of Wisconsin-Madison, 1500 Johnson Dr., 53706 Madison, WI, USA |
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Abstract: | A model is developed to describe dynamic interaction of particles with the carrier gas during detonation spraying. Equations
of mass, energy, and momentum conservation are integrated numerically for the two-phase particle-gas flow with the Hugoniot
boundary conditions at the detonation wave front. Velocity and temperature of the sprayed powder and the gas parameters are
calculated self-consistently, taking into account effects of friction and cooling of the gas in the vicinity of the gun barrel
and effects of particle-gas interaction on the parameters of the gas phase. Calculations are performed for tungsten carbide
particles of 30 μm diam and a 1.8 m long detonation gun using a stoichiometric mixture of oxygen and propane. Distributions
of gas and particle parameters along the barrel are calculated for various moments of time. Tungsten carbide particles of
30 μm reach an exit velocity of 1278 m/s and a temperature of 1950 K. Exit particle velocity is a nonmonotonic function of
the loading distance,L, with a distinct maximum atL = 75 cm. The proposed model can be applied to a broad range of problems related to detonation coating technology and allows
evaluation of the effectiveness of various designs and optimization of operational parameters of detonation spraying systems. |
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Keywords: | Chapman-Jouguet point detonation gun gas detonation shock wave |
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