High Altitude Environment, High Pressure Common Rail Diesel Engine Fueled With Biodiesel

The conflict between the growth of vehicle stock and scarcity of fossil resource is becoming more and more serious, promoting the development of alternative fuel. The tendency of Diesel vehicles, promotes alternative fuel onto a crucial position. As green liquid energy resource, Biodiesel is attractive because it has the similar physical and chemical properties with diesel. Yunnan Province is located in the southwest of China, and more than 95% area of that is the plateau area whose altitude is between 1,500 meters and 2,000 meters. In order to relieve the pressure of energy in Yunnan, doing reaearch on biodiesel engine has great significance in the plateau region (Kunming).Analyzing the physical and chemical propertieso of biodiesel-diesel of different proportions theoretically and the probable effects on diesel engine's performance, the comparative bench testing has been done on a turbocharged and inter-cooled, a high pressure and common rail diesel engine fueled with biodiesel-diesel blends and pure diesel. Doing research on power, economic, soot emission performance when the engine was fueled with biodiesel, universal characteristic curve graph of brake specific fuel consumption was made out and economic operating zone of different blends was compared.The testing and research results indicate that when the engine was fueled with biodiesel-diesel blends, comparing with pure diesel at full load, the torque and power of engine decline, brake specific fuel consumption increasing, and soot emission decrease. With the proportion of biodiesel increasing in the blends, amplitude of variation increases. Comparing with pure diesel at part load, brake specific fuel consumption increasing, and soot emission decreases. With the proportion of biodiesel increasing in the blends, amplitude of brake specific fuel consumption increases. When a high pressure and common rail diesel engine is fueled with biodiesel-diesel blends, soot emission declines comparing with pure diesel, and the declining amplitude increases with the rotating speed and load increasing. Also declining amplitude increases with the proportion of biodiesel increasing. The universal characteristic curve graph indicates that biodiesel has little effects on economic operating zone of the blends for the high pressure common rail engine. With the proportion of biodiesel increasing, the equivalent fuel consumption of economic operating zone increases, and the research indicates that when the engine has the best performance, the volume fraction of biodiesel in the blends is between 10% and 20%.