A RESEARCH STUDY ON THE EFFECTS OF INTAKE CONDITIONS ON COMBUSTION CHARACTERISTICS HCCI ENGINE FUELED BY PRF80 FUEL

Abstract

Recently, HCCI mode in the internal combustion engine is one of a trend study
of the scientist. The advantages of HCCI mode are increased heat performance and
decreased emission. In this paper, PRF80 (Primary Reference Fuel, 80% -iso Octane
and 20% n-heptane) was evaluated. The intake conditions such as intake
temperature, intake pressure and dilution ratio by nitrogen (N2) were investigated
to study the characteristics of combustion with PRF80 fuel. Results shown that, rise
ER and intake pressure lead to in-cylinder temperature and pressure increased of
both combustion phases. The intake temperature effect directly in HCCI combustion
mode, intake temperature from 50oC to 150oC, results on in-cylinder pressure and
heat release rate vary both value and position of peaks near the top dead center.
Besides, this work also was researched dilution by nitrogen (N2) for control the
combustion, the result shown that, increasing N2 lead to delay of the combustion
timing, but not influence the cool flame.