الفهرس 
chapter 1Only 14 pages are availabe for public view
 |  | from | 216 |  |  |
| | | from | 216 | | |
Abstract
Modem dual fuel engine is looking for a new alternative fuel because of
the higher prices and lower production of diesel oil. Jatropha biodiesel is
a promising substitute as an alternative fuel has gained significant
attention due to the predicted shortness of conventional fuel and
environmental concerns. The operating test values obtained from the
Jatropha oil is closely matched with the values of conventional diesel and
can be used in the existing diesel engine without any modification. This
theses studies the most promising propulsion alternatives of future
Liquefied Natural Gas (LNG) carriers running by dual fuel engine used
boil off gas (BOG) from LNG carriers cargo tanks vessels as main fuel
and Jatropha biodiesel oil as a pilot fuel. An experimental and
computational fluid dynamics (CFD) investigati9n were. performed to
investigate the influence of dual-fuel combustion on the performance and
exhaust emissions of a direct injection (DI) diesel engine fueled with
Jatropha oil and natural gas (NG). A single cylinder diesel engine was set
up and arranged to measure and study the engine performance at all
running parameters. The test rig aims to simulate the operating conditions
of BOG in propulsion machinery of LNG carriers. The present
investigation studies the engine performance and emissions
experimentally as well as theoretically by CFD at different loads to obtain
the best load condition by using natural gas and Jatropha biodiesel oil.
The output results showed that the thermal and volumetric efficiency of
diesel engine is higher than Jatropha biodiesel engine. The specific fuel
consumption, exhaust gas temperature, Unburnt hydrocarbon (HC),
Carbon dioxide (C02) and Nitric monoxide NO were comparatively
higher in Jatropha biodiesel. On the other hand an appreciable increase in
cylinder pressure and Carbon monoxide (CO) emission when using
Jatropha. It was observed that the combustion characteristics of the
Jatropha biodiesel are closely similar to the base line of diesel oil. This
means that, Jatropha biodiesel can be used instead of diesel fuel oil with
safe engine operation to overcome the decreasing production .and higher
prices of diesel oil fuel.