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中文摘要：
利用CFD-FIRE软件对1台燃用生物柴油的直喷自然吸气式柴油机建立了喷雾和燃烧计算模型，并进行了模型修正。基于正交试验法进行数值模拟计算，考察了供油提前角、EGR率、喷雾夹角和喷孔直径4个因素对生物柴油发动机NOx排放的影响。通过极差分析与方差分析，确定了因素的主次关系，并对最优化匹配方案进行了预测。研究结果表明，EGR率为影响NOx生成的最显著因素，其次分别为喷孔直径、供油提前角及喷雾夹角。最佳匹配方案：供油提前角为7°CA，EGR率为0．15％，喷雾夹角为150°，喷孔直径为0．27mm。
英文摘要：
For a naturally aspirated direct injection bio-diesel engine, the calculation models of spray and combustion were built and modified with the CFD-FIRE software. Based on the orthogonal experimental method, the numerical simulation was carried out and the influences of fuel supply advance angle, EGR rate, spray angle and nozzle diameter on NOx emission were analyzed. Through the range and variance analysis, the importance degrees of influencing factors were determined and the optimal configuration of parameters was predicted. The results show that the noticeable influence on NOx emission is EGR rate, followed by nozzle diameter, fuel supply advance angle and spray angle. It is also found that the NOx emission is lowest when the parameters of injection timing angle, EGR rate, spray angle and nozzle diameter are orderly configured with 7 °CA,0. 15%, 150° and 0. 27 mm, nozzle diameter of 0. 27 mm.
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