Effect analysis on cold starting performance enhancement of a diesel engine fueled with biodiesel fuel based on an improved thermodynamic model
Effect analysis on cold starting performance enhancement of a diesel engine fueled with biodiesel fuel based on an improved thermodynamic model
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基于改进热力学模型的生物柴油柴油机冷启动性能增强效果分析
DOI：
10.1016/j.apenergy.2019.03.204
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发表时间：
2019-06
期刊：
影响因子：
11.2
通讯作者：
Yin Zibin
中科院分区：
文献类型：
--
作者：
Jiaqiang E;Liu Guanlin;Zhang Zhiqing;Han D;an;Chen Jingwei;Wei Kexiang;Gong Jinke;Yin Zibin
柴油机在低环境温度下实现冷启动是非常重要的，特别是在温度范围为−40 °C至0 °C的区域。因此，具体的冷启动特性，如气体泄漏，热损失和余隙容积，应详细研究。为了研究其冷起动性能，提出了一种改进的热力学参数计算模型。当绝热指数为1.34时，着火温度的预测值与实验值最接近。热力学计算结果表明，泄漏率对压缩压力的影响最为敏感，其次是传热损失率和参考余隙容积。采用漏气量、热损失和余隙容积等指标对柴油机冷起动性能进行了研究，为加强柴油机冷起动性能的研究提供了参考。小余隙容积和大进气初温有利于提高柴油机的火用。另外，随着余隙容积的增大，熵产生也增大。同样，系统的（火用）将随着熵产生的增加而减少。最后，提出了提高柴油机冷起动性能的改进建议。
It is very important for the diesel engine to achieve a cold startup at low environmental temperature especially in the region with the temperature in the range of −40 °C to 0 °C. Thus, the specific cold start characteristics, such as gas leakage, heat loss and clearance volume, should be investigated in detail. In order to investigate the cold start ability, an improved thermodynamic model for thermodynamic parameters is developed. The prediction of ignition temperature is the closest to the experimental values when the adiabatic index is equal to 1.34 for the compressed gas. The thermodynamic results show that the compression pressure is the most sensitive to the gas leakage rate,followed by the heat transfer loss rate and reference clearance volume. The gas leakage, heat loss and clearance volume are employed to investigate the cold start ability for the diesel engine, which provide a better reference for strengthening the cold start capacity research. The small clearance volume and big initial intake air temperature can improve the exergy of diesel engine. In addition, the entropy production increases with the increase of clearance volume. Similarly, the exergy of system will reduce with the increase of entropy production. Finally, the improvement suggestions for cold starting performance enhancement of the diesel engine are proposed.
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