4. Conclusions
In this paper, the operating range and combustion characteristics
of methanol fumigation on a heavy duty diesel engine were
investigated. A series of tests were conducted separately under
neat diesel mode and diesel methanol dual fuel (DMDF) mode,
with the engine running at ten different loads and fixed engine
speed of 1400 r/min. During each test, mass flow rates of the diesel
and methanol were measured separately as well as the cylinder
pressure. From the analysis results, plots of the pressure and the
apparent heat release rate in the combustion chamber reveal four
operating bounds, which shed light into the combustion mechanism
when using methanol fumigation on heavy duty diesel
engines. The investigation results are summarized as follows: