2006-07-21 05:39:03 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
A cross between diesel and conventional combustion techniques. Diesel engines produce soot because the charge is nonhomogeneous, since fuel is sprayed into the hot compressed air space and ignites as it enters, thus having no chance to mix thoroughly. An HCCI engine compression-ignites a charge that has been better mixed by being either carbureted or injected before induction into the cylinder, or being direct-injected as in a diesel but using swirl, charge stratification, more volatile fuel and/or a leaner mixture. Of course it's more complicated than a simple description can convey, and is very much in the experimental stage right now. One issue is preventing engine knock, which requires a leaner than normal mixture to limit the detonation and precise mixture control to prevent preignition. See the references.
2006-07-21 10:50:58 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋
Something likely to happen in a Diesel cycle engine. Certain fuels will ignite when compressed to a given pressure.
2006-07-21 05:46:55 · answer #2 · answered by Paul 3 · 0⤊ 0⤋
I think the first two guys are on the right path but I also think it has to do something witht the stociometric ratio. Its the ratio of fuel air mixture that creates homogenoues combustion
2006-07-21 10:45:08 · answer #3 · answered by karan k 1 · 0⤊ 0⤋
This is how a diesel works as an example.
2006-07-21 05:45:26 · answer #4 · answered by Jeffrey S 6 · 0⤊ 0⤋