Abstract
Abstract
The objective of this work was to compare the burned gas temperature measured using coherent anti-Stokes-Raman scattering (CARS) with the predictions of a multiple-zone computer simulation of combustion. The tests were at various engine operating conditions with different fuels. Mean cycle modelling was used initially to obtain the appropriate heat transfer tuning parameters for the engine simulation by matching to the cylinder pressure. The predicted mean cycle burned gas temperatures gave good agreement with the measured mean temperatures. Similarly, cycle-by-cycle modelling produced burned gas temperatures that agree with the measured values.
This work showed that the multi-zone computer simulation could accurately predict the burned gas temperature once the fuel burn rate and completeness of combustion have been analysed and the model tuned correctly. The effects of methanol, methane, toluene and iso-octane on the burned gas temperature were investigated. It was found that the fuel burn rate and the adiabatic flame temperature affected the burned gas temperature. Fuels with a high burn rate (such as methanol) have a lower burned gas temperature towards the end of the engine cycle. Toluene has the highest adiabatic flame temperature and hence gave the highest burned gas temperature.
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