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Song J.,Automobile Engineering School | Yao J.,Automobile Engineering School | Lv J.,Automobile Engineering School | Zhu C.,Automobile Engineering School
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

Biodiesel is a renewable and environmentally friendly alternative fuel derived from natural fats or vegetable oils and it is considered as an attractive alternative to replace diesel fuels. To optimize the application of biodiesel on vehicle diesel engines, the power and fuel economies performances of a diesel fueled with soybean biodiesel were investigated under different engine loads and speeds. Experimental results show that, compared with diesel fuel, with increase in the biodiesel in the blends, the brake power and torque and the brake specific energy consumption increase, the smoke density under free acceleration decreases except B10, the NOX emissions increase. The trade-off relationship is clear between the NOX and smoke density when the diesel engine fueled with different biodiesel percentage in the blends. From the trade-off relationship between NOX and smoke density, the optimum blend ratio is B20 in the experimental study. © Maxwell Scientific Organization, 2013.

Song J.-T.,Automobile Engineering School | Yao J.-B.,Automobile Engineering School | Zhu C.-H.,Automobile Engineering School
Applied Mechanics and Materials | Year: 2013

Biodiesel has been gaining worldwide popularity as an alternative energy source because of its many benefits. In order to optimize the application of biodiesel the low-temperature fluidity, pulverization, evaporation, invariability, erosion capability, cleanliness and mutual solubility of the low blending rate soybean-oil-methyl-ester biodiesel-diesel blends were compared and analyzed. Then the engine tests have been carried out with the aim of obtaining comparative measures of emissions such as CO, smoke density, HC and NOx to evaluate and compute the behavior of the diesel engine running on the low blending rate biodiesel-diesel blends. The experimental results show that the low blending rate biodiesel -diesel blends conform to the standard GB252-2000 of China. Compared with the original diesel engine, the smoke, HC and CO emissions of diesel engine fuelled with low blending rate soybean-oil-methyl-ester decrease, but NOx emissions increase. © (2013) Trans Tech Publications, Switzerland.

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