Abstract
In this study, a mathematical model for investigation the effects of internal heat losses on the flame speed and temperature profile in Aluminum Particle Clouds combustion with continues reaction rate have been studied. The present study extended previous results by bridging the theories of the non-adiabatic stationary dust flame and the propagation of premixed flames in one-dimensional channels accounting for heat-losses to particles and environment. The results showed that the effects of heat losses played an important role in flame regimes and flame transition. Furthermore, it was found that convective heat losses significantly decreased the velocity of flame propagation and temperature in post-flame zone. Comparisons between the analytical solutions and the experiment results showed a good agreement.
Highlights
The majority of practical applications of aluminum combustion such as solid rocket motors, dust explosions in industry and chemical reactors involve combustion of dust suspensions of small particle sizes (Seshadri et al, 1992; Bidabadi and Sediqhi, 2002)
Above equations are defined as: The corresponding ignition temperatures are 2100 K, Fig. 2: Dependence of flame speed to dust concentration et al (2005) is nearer to the experimental results, which can indicate the effect of heat loss
The present results show that flame propagation velocity depends on the particle size, it means that for the same global particle mass concentration in air the flame speed increase whit decreasing particle size
Summary
The majority of practical applications of aluminum combustion such as solid rocket motors, dust explosions in industry and chemical reactors involve combustion of dust suspensions of small particle sizes (Seshadri et al, 1992; Bidabadi and Sediqhi, 2002). An experimental and theoretical modeling for aluminum dust cloud with air as an oxidizer, have been presented by Goroshin et al (1996a, b) and Bidabadi and Sediqhi (2002) and combustion particle-laden flows and parameters have been estimated. In previous theoretically model with continues reaction rate, assumed that convective heat loss from gas to particle surfaces is negligible.
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