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Combustion and emissions characteristics of biodiesel
  
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KeyWord:biodiesel  combustion  emission  injection timing
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HU Jiangong, WANG Yujin  
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Abstract:
      The effects of different injection strategies on the combustion and emission characteristics of biodiesel from fish oil ethyl ester and its mixture were studied on a four-stroke DI diesel engine. When the engine speed was fixed at 1 500 r/min and the fuel injection timing was under different loads of 21, 24°CA BTDC and 27°CA BTDC respectively, the six fuels, including diesel and fish oil ethyl ester biodiesels of B20, B40, B60, B80 and B100 were used. The results showed that under the conditions of different fuel injection timings and loads, the largest declines in nitrogen oxides and soot emissions of the engine were 17.9% and 55.38%, respectively. Biodiesel from fish oil caused the cylinder pressure peak, exothermic rate and the maximum pressure rise rate lower than those for diesel fuel, and the HC and CO emissions reduced.
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