Performance and Emission Characteristics of Diesel Fuelled Homogeneous Charge Compression Ignition (HCCI) Engine

ABSTRACT: An experimentally investigation is carried out to analysis the performance and emission characteristics of Homogeneous charge compression ignition engine (HCCI). Over the past decades many researcher have been discussed about working of HCCI engine. The HCCI engine is a suitable replacement for compression ignition engine (CI). This paper experimentally investigate the performance and emission characteristics of a HCCI engine at different load with constant speed and compare with convention CI engine. In this research, the HCCI mode engine uses the port fuel injection (PFI) for preparing the homogeneous air-fuel mixture. The results show that the specific fuel consumption is decreased for diesel fuelled HCCI mode engine compared to DI-CI engine. The brake thermal efficiency of HCCI mode engine is even as same or slightly increased. From the result observed that the value of oxides of nitrogen (NOx) and particulate matter (PM) emissions are very low than the DI diesel engine. The rate of reduction of NOx and PM are about 20% and 5% respectively. But the exhaust emission of un burnt hydrocarbon (UHC) and carbon monoxide (CO) are higher than DI mode diesel engine

A COMPREHENSIVE REVIEW ON COMBUSTION OF COMPRESSION IGNITION ENGINES USING BIODIESEL INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING AND TECHNOLOGY (IJMET) IJMET © I A E M E

ABSTRACT The world today is confronted with a twin crisis of fossil fuel depletion and environmental degradation. Rapid depletion of petroleum derived fuels has forced the researchers to find out alternative fuels for IC engines. Biodiesel is an alternative fuel for conventional diesel engines and can be used without major modification of the engines. When compared to diesel, biodiesel has a higher cetane number which results in shorter ignition delay and longer combustion duration and hence results in low particulate emissions. The combustion of CI engine is a complex process due to its combustion mechanism. The combustion characteristics of an engine are defined by parameters such as cylinder pressure, maximum rate of pressure rise, heat release, cumulative heat release, ignition delay and combustion duration. Analysis of combustion characteristics is significant because it provides the important information which in turn helps in interpreting the engine performance and exhaust emissions. This paper reviews the combustion analysis of compression ignition engines using biodiesel. It is found that the ignition delay for biodiesel seems to be less when compared to diesel. Moreover, it reveals that the heat release rate is more during the diffusion combustion for biodiesel and its blends than diesel. Similarly a marked difference is seen in the cumulative heat release rate and combustion duration