DSpace コレクション:
https://usprepo.office.usp.ac.jp:443/dspace/handle/11355/320
2023-10-27T03:27:37ZLow compression ratio diesel engines fueled with biodiesel by using spark-induced compression ignition
https://usprepo.office.usp.ac.jp:443/dspace/handle/11355/497
タイトル: Low compression ratio diesel engines fueled with biodiesel by using spark-induced compression ignition
著者: YAMANE, Koji; Kondo, Chihiro; Kondo, Daichi; KAWASAKI, Kiyoshi
抄録: The objective of this study is to demonstrate a novel combustion system in
which auto-ignition is induced by spark discharge into a pre-mixture
formed during a long ignition delay time at a direct injection(DI) diesel
engine with a low compression ratio. An experiment is conducted to
investigate the potential of spark discharge on the auto-ignition process by
changing the spark timing, injection timing, equivalence ratio, and fuel
amount. The fuel used is lauric methyl ester, which is a fatty acid methyl
ester that has relatively higher volatility and higher ignition quality than
petro diesel fuel. The results obtained by single cylinder common-rail DI
diesel engine show that with a volumetric efficiency of 34%, spark-induced
compression ignition (SICI) combustion is observed. In this study, the
auto-ignition timing is advanced by spark discharge and is controlled by
the spark timing within 5 deg. CA. We also observed SICI combustion
flame by constant volume combustion vessel using direct flame high-speed
photography and OH radical chemiluminescence spectroscopy by means of
the combination of an optical band-pass filter, an image intensifier and
CCD camera. As a result, it was found that SICI occurs not by flame
propagation due to spark ignition but by auto-ignition of pre-mixture formed by spray. It was also clear that the auto-ignition is induced by
transportation of OH radical at spark plug with spray flow.2014-07-05T15:00:00Z