ARTICLE:

• MODELLING OF HEAT TRANSFER AND IGNITION PROCESSES IN A DIESEL SPRAY  download article

Sergei S. Sazhin
Sir Harry Ricardo Laboratories, Internal Combustion Engines Group, School of Environment and Technology, Faculty of Science and Engineering, The University of Brighton, Cockcroft Building, Brighton BN2 4GJ, UK

E. M. Sazhina
School of Engineering, Faculty of Science and Engineering, University of Brighton, Cockcroft, Building, Brighton BN2 4GJ, United Kingdom

G. Feng
School of Engineering, Faculty of Science and Engineering, University of Brighton, Cockcroft, Building, Brighton BN2 4GJ, United Kingdom

Morgan R. Heikal
School of Environment and Technology, Faculty of Science and Engineering, The University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4GJ, United Kingdom

Igor Goldfarb
Department of Mathematics and Computer Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel

V. Gol'dshtein
Department of Mathematics and Computer Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel

G. Kuzmenko
Department of Mathematics and Computer Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 84105, Israel

ABSTRACT

The system of equations describing the effects of heating, evaporation and combustion of fuel droplets is simplified by assuming that the Nusselt and Sherwood numbers are equal to 2. The radiative energy exchange between the fuel droplet surface and gas is described using the P-1 model with Marshak boundary conditions. The chemical term is presented in the Arrhenius form with the pre-exponential factor estimated using the CFD package VECTIS of Ricardo Consulting Engineers with the Shell autoignition model. The resultant system of ordinary differential equations is analysed based on the geometrical version of the integral manifold method. Results predicted by the analytical solutions are compared with the results predicted by VECTIS CFD calculations. The start of ignition predicted by VECTIS calculation for a polydisperse spray agrees with the experimental data for a medium duty truck diesel engine. It is pointed out that the effects of thermal radiation lead to a reduction in the production of NO_x emissions.

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