Questions
(7.1)
Three different approaches are used to obtain charge stratification viz., spray jet
controlled, wall controlled and flow controlled Discuss the differences in
the
duration of initial heat release rate ( 0 to 10%) and heat release rates towar
ds
the end of combustion ( 80 to 90%)
with the three methods. What factors are
responsible for these differences?
(7.2)
What type of emission control technologies may be employed to reduce HC and NO
x
emissions in the DISC engines operating in the different air-fuel ratio regimes?
(7.3)
What are significant differences between CAI and HCCI engine systems from the
point of mixture preparation and charge homogeneity?
(7.4)
What are main methods being studied to HCCI combustion in the diesel type
engines? Discuss their merits and demerits.
(7.5)
Why is it not possible to build a practical engine to operate in HCCI mode in the
whole speed and load range of a SI or CI engine?
(7.6)
Discuss why a HEV is more energy efficient than the vehicles powered by the
conventional IC engine
(7.7)
Discuss why a HEV is more energy efficient than the vehicles powered by the
conventional IC engine
(7.9)
Discuss why the energy efficiency of fuel cells at part loads is much higher than for
the IC engines.
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