Numerical modeling of Non-ideal Multicomponent mixture Sprays

Vaisakhan, V S (2014) Numerical modeling of Non-ideal Multicomponent mixture Sprays. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Modeling a multi-component fuel mixture had been of utmost importance in analyzing the atomization and evaporation characteristics, penetration length of the mixture and the distribution of mixture inside the engine chamber at different operating pressures, temperatures and the concentrations of the mixture. The present study is done on a heterogeneous mixture of iso-octane and ethanol to deduct the spray penetration at various cabin pressures and temperatures and the simulation results have been presented in the work. WAVE model have been activated as the secondary break-up model for the atomization of droplets. The droplets are continuously tracked for its properties using the discrete phase model and are coupled with the continuous phase for energy and momentum. The vapourliquid equilibrium is established using the concentrations of the mixture and individual components with the help of user inputted C-code. The simulation result for a single component droplet of do-decane has been validated with the experimental results. A parametric study on the ideal multi-component mixture model has been done to show the variation in spray penetration length at temperatures 500,700 and 900 k with varying cabin pressures of 1.1, 3.0 and 5.0 Mpa. The ideal multi-component mixture shall be extended to non-ideal mixtures of hydrocarbon and alcohols.

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