28-11-2009, 07:18 PM
Homogeneous charge compression ignition HCCI engine-presentation.ppt (Size: 1.33 MB / Downloads: 1,664)
Abstract
Homogeneous charge compression ignition (HCCI) is a form of internal combustion in which well-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition. Homogeneous charge compression ignition (HCCI) engines have
the potential for high efficiencies and low pollutant emissions.By comparison with spark ignition (SI) engines, for example,HCCI engines can yield a 15-20% increase in fuel economy while emitting lower levels of oxides of nitrogen (NOx).HCCI engines can also achieve thermal efficiencies comparable to diesel engines yet maintain near zero levels of
particulate emission,As in other forms of combustion, this exothermic reaction releases chemical energy into a sensible form that can be translated by an engine into work and heat
see more
http://en.wikipediawiki/Homogeneous_char...n_ignition
http://web.mit.edu/greengp/projects/HCCIeng.htm