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1 Journal of KONES

1 2000

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Numerical simulation of spray formation, ignition and combustion in a diesel engine, using complex chemistry approach

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Jarnicki R. , Teodorczyk A. , Golovitchev V. , Chomiak J.

Journal of KONES

2000

tom Vol. 7, No. 1-2

247-257

Computational simulation of spray formation, ignition and combustion in a Volvo D12C Diesel DI Engine using KIVA code is presented in this paper. High-pressure injection system in diesel engines gives possibility of reduction of soot emission due to better fuel atomization and reduction of injection time. Engines using such a system are already in use, but researchers are still looking for possibilities of improving the efficiency and reducing the emission of pollutant exhaust gases species. One possibility of looking for better engine parameters is numerical simulation of engine cycle. It gives possibility of easy changing of work parameters, without an expensive test engine modifications. To achieve close to real exhaust gases composition, detailed chemistry approach is required. One has to remember that numerical results cannot be taken as real ones. They can be used for comparison of several cases and choosing the best one for experimental testing. The Volvo D12C engine has a high compression ratio (16.0), and a high-pressure fuel injection system (pressure in the injection-pump up to 1500 bar). At about TDC fuel is injected with a velocity up to 500 m/s into the highly turbulent, 120-bar environment of the combustion chamber, making simulations difficult.