Abstract
Effects of ambient temperature, O_2 concentration and injection duration on combustion and emission characteristics of diesel spray under high temperature and high pressure ambient were experimentally examined using a constant volume vessel. It is confirmed that the ambient temperature /pressure has large effect on the shape of heat release rate, the ignition delay and the combustion duration. As the decrease of ambient O_2 concentration, both of the ignition delay and the combustion period become longer. The NOx emission increases with the increase of ambient temperature and the increase of O_2 concentration. The CO emission increases abruptly under the low ambient temperature and the low O_2 concentration condition.
