A model for spray penetration in diesel engines is suggested.
It is based on momentum conservation for a realistic
mass flow rate transient profile. The modelling approach is
based on tracking of centre-of-fuel-mass (COFM) of injected
diesel fuel. The model was validated for Bosch and Delphi
injectors using the data obtained at Sir Harry Ricardo automotive
centre, University of Brighton, UK. The model is shown to
produce a good agreement with the experimental data until
major spray instability (such as cluster shedding). It has been
found that the dispersion time (the adjustable model parameter)
is increasing when injection pressure is decreasing. This follows
the known tendency for spray breakup time