الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 138 |  |  |
| | | from | 138 | | |
Abstract
The human is facing two problems are the depletion and the environmental pollution of fossil fuels. Vegetable oils after chemical treatments may be used as an alternative fuel. In this study, jatropha biodiesel fuel blends were used by volumetric ratios of 20%, 40%, 60%, 80% and 100% with Diesel fuel, to evaluate Diesel engine performance and exhaust emissions. Jatropha oil was extracted from jatropha carcass and converted to biodiesel fuel using transesterification reaction. Tests were performed on a four stroke, two cylinder Diesel engine at different speeds, namely 500, 750, 1000.1250 and 1500 rpm. At each speed, the engine is operating at no load; quarter, half, three quarters and full load. The present study reveals that, locally jatropha biodiesel fuel can be used as an alternative fuel for Diesel engines without any engine modification. However, there was a decrease in engine performance with increasing biodiesel fuel percentage in the blends. The results showed a decrease in both of brake power by 16%, equivalence ratio by 25%, brake thermal efficiency by 22%, volumetric efficiency by 11%. The results also showed increases in both of specific emissions of carbon monoxide by 41%, specific emissions of oxides of nitrogen by 49%. While, there is a decreases in specific emissions of carbon dioxide by 17%.