Quote:
Originally Posted by mwebb
no
....................
so
Combustion pressure is reduced by the presence of the INert gases which do take up space but do not support combustion
the INert gases behave like a cushion , to reduce compression ratio and therefore combustion pressure
while EGR is operational
combustion temperature IS reduced because Combustion pressure IS reduced,
not the other way around........
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Why do you say "compression ratio is reduced"? the volume of the cylinder at the bottom of the stroke is the same with or without EGR? as it is at the top?
then, pressure at the bottom is actually increased, as the vacuum is reduced by letting in exhaust gas, also, less power is reduced as less air flows through the trottle, so the throotle then has to be opened more to compensate as the same power is needed in the same conditions. the pressure after combustion is reduced as some of heat is used to heat up the included exhaust gas.