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1 2012

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Numerical Simulations of a Simultaneous Direct Injection of Liquid And Gaseous Fuels Into a Constant Volume Chamber

Kapusta Ł. J., Teodorczyk A.

Journal of Power Technologies

2012

Vol. 92, nr 1

12-19

Numerical simulations of the dual fuelling process by simultaneous direct injection of liquid and gaseous fuels into a combustion chamber were performed. Diesel fuel and CH4 were injected into a constant volume vessel through separate nozzles. Injection started for both fuels at the same time. The presented simulations were done using the AVL Fire code - the CFD software dedicated to engine simulations. This work was the first step in a process of modeling the full engine cycle, including combustion. The aim of the study was to validate the spray model before applying it to more complex simulations. One major simplification was made to speed up the calculation process: instead of full chamber geometry only a 60 deg sector of the cylindrical chamber containing only two nozzles, one for gaseous fuel and one for liquid was investigated. The simulation results were compared with literature data [12]. The images from the numerical solution presenting spray droplets and CH4 concentration were compared with images made by the shadowgraph technique [12].