Abstract
In this paper we report a new development in the numerical model for aluminum-steam combustion. This model is based on the diffusion flame of the continuum regime and the thermal equilibrium between the particle and the flow field, which can be used to calculate the aluminum particle combustion model for two phase calculation conditions. The model prediction is in agreement with the experimental data. A new type of vortex combustor is proposed to increase the efficiency of the combustion of aluminum and steam, and the mathematical model of the two phase reacting flow in this combustor is established. The turbulence effects are modeled using the Reynolds Stress Model (RSM) with Linear Pressure-Strain approach, and the Eddy-Dissipation model is used to simulate the gas phase combustion. Aluminum particles are injected into the vortex combustor, forming a swirling flow around the chamber, whose trajectories are traced using the Discrete Phase Model (DPM). The simulation results show that the vortex combustor can achieve highly efficient combustion of aluminum and steam. The influencing factors, such as the eccentric distance of the inlet of aluminum particles, particle size and steam inlet diameter, etc., are studied.
Highlights
Aluminum is an important energetic component of many solid propellants, explosives, and pyrotechnic formulations, and is used as a new energy material since the aluminum-water reaction can produce hydrogen and form aluminum fuel cells [1]
Many aspects of the aluminum and water reaction were researched in aluminum-water ramjet and aluminum-water power systems such as Hybrid Aluminum Combustor (HAC) [2], or Hybrid Aluminum Combustor -Solid
Oxide Fuel Cell (HAC-SOFC) [3,4] and the results shows that this system has high energy density
Summary
Aluminum is an important energetic component of many solid propellants, explosives, and pyrotechnic formulations, and is used as a new energy material since the aluminum-water reaction can produce hydrogen and form aluminum fuel cells [1]. The vortex combustor concept was proposed by Miller [9,10] and experimental studies were carried out In this design aluminum particles are injected into the vortex combustor and form a swirling flow around the chamber. There arearenoestablished relevant research reports the residence times and proper temperature ignition zone for particles It is on expected performance optimization and calculation of the vortex combustor. There are many size and burning to time were obtained, as d1.8 and According thelaws existing research, thesuch combustion lawdof aluminum particles is basically based studies the perspective of the mathematical model and theory [14,18,19,20,21,22], when the on thefrom combustion experiments of single particles particle groups,whereby and various particle. Computational cost, only a quarter of theiscombustor is simulated periodic boundary conditions
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