EFFECT OF EGR ON HCCI ENGINE WITH HYDROGEN AS FUEL

In recent years a great deal of work has been done and the research area has extended to all aspect of the combustion process. It has been gradually presenting a picture of energy saving and cleaner exhaust emissions. Increasing environmental concerns regarding the use of fossil fuels and global warming have prompted researchers to investigate alternative fuels. All engine manufacturers of today are seriously challenged, not only by legislative demands of low emissions, but also by the need to decrease the dependency on non-renewable fuels, such as oil. Hydrogen (H2) has been suggested as a possible replacement for the fuels used today ,the way to reach this goal is to using new combustion concepts, such as Homogeneous Charge Compression Ignition Homogeneous Charge Compression Ignition (HCCI) engines promise high thermal efficiency combined with low levels of nitric oxide and particulate matter emissions where HCCI engines can operate on gasoline, diesel fuel, and most alternative fuels and studies suggest that the concept of an HCCI engine running on H2 would result in a locally emission free engine. The scope of this proposal is to study the key processes involved with H2 HCCI combustion and examine whether the mechanisms of these processes can be easily incorporated into current engines further more to investigate broaden the stable operations range for HCCI a series of experiments were analyzed using hydrogen fuel adaptation and their composition and the exhaust mechanism of the exhaust gas.