To increase the efficiency and accuracy of computing, an improved combined weight coefficient is used to develop an improved heat transfer model in AVL-BOOST environment. Similarly, a five-component biodiesel skeletal mechanism is employed to investigate the combustion process of biodiesel fuel. Then, the AVL-BOOST model is validated by the experimental results under different conditions. Finally, the improved heat transfer model is employed to investigate the propulsion and load characteristics of diesel engine fueled with biodiesel fuel in terms of power, BSFC, soot, and NO_x emission. The result shows that the errors between experiment and simulation are less than 2% and the simulation model can predict the propulsion and load characteristics of the diesel engine. In addition, the comprehensive characteristic of case 5 is the best. Moreover, the big inject orifice is not beneficial to the fuel atomization and more soot is produced. Thus, it is very important to choose the appropriate injection rate reasonably.

中文翻译：

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基于改进模型的生物柴油供油柴油机性能提升和减排效果分析

为了提高计算效率和准确性，在AVL-BOOST环境中使用了改进的组合权重系数来开发改进的传热模型。同样，采用五组分生物柴油的骨架机理来研究生物柴油燃料的燃烧过程。然后，通过不同条件下的实验结果验证了AVL-BOOST模型。最后，采用改进的传热模型来研究以生物柴油为燃料的柴油发动机的推进和负荷特性，包括功率，BSFC，烟灰和NO _x。排放。结果表明，实验与仿真之间的误差小于2％，仿真模型可以预测柴油机的推进特性和载荷特性。另外，情况5的综合特性最好。而且，大的喷射孔不利于燃料雾化并且产生更多的烟灰。因此，合理选择合适的注入速率非常重要。