Government legislation on particulate matter (PM) and oxides of nitrogen (NOX)
emissions have become increasingly stringent over the past decades. Future projections
have led to internal combustion (IC)engine developers exploring advanced combustion
technologies which may replace or supplement current state of the art systems.
Advanced combustion technologies such as Low Temperature Combustion (LTC) cover
a broad series of mechanisms that seek to attain in-cylinder Equivalence ratio (f) -
Temperature (T) combinations during combustion which lead to acceptable emissions
of exhaust PM and NOX. These are generally achieved by a combination of EGR
dilution and extended ignition delays for mixture preparation. Another common feature
of LTC is the poor combustion efficiency due to severe requirements placed on mixture
quality as lower temperatures and oxygen concentrations reduce local ignitability limits.
Therefore, a significant amount of work on LTC is centred around understanding the
spatial and temporal development of inadequately prepared mixtures during LTC. The
investigations presented in this thesis are expected to contribute to this body of work
as they are predicated on the hypothesis that current mixture preparation methods are
insufficiently adapted to conditions present in LTC combustion modes. [Continues.]
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.