Non-equilibrium diffusion combustion of a fuel droplet |
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| Institution: | 1. Graduate Research Assistant, Purdue University, West Lafayette, 47907 IN, USA;2. Post-Doctoral Research Associate, Purdue University, West Lafayette, 47907 IN, USA;3. Graduate Research Assistant, University Central Florida, Orlando, 32816 FL, USA;4. Principal Engineer, Combustion, Siemens Energy Inc., Orlando, 32826 FL, USA;5. Assistant Professor, Purdue University, West Lafayette, 47907 IN, USA;1. Department of Mechanical Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey;2. Department of Mechanical Engineering, Capital University of Science and Technology, Islamabad, Pakistan |
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| Abstract: | A mathematical model for the non-equilibrium combustion of droplets in rocket engines is developed. This model allows to determine the divergence of combustion rate for the equilibrium and non-equilibrium model. Criterion for droplet combustion deviation from equilibrium is introduced. It grows decreasing droplet radius, accommodation coefficient, temperature and decreases on decreasing diffusion coefficient. Also divergence from equilibrium increases on reduction of droplet radius.Droplet burning time essentially increases under non-equilibrium conditions. Comparison of theoretical and experimental data shows that to have adequate solution for small droplets it is necessary to use the non-equilibrium model. |
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