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适用于hcci的正庚烷化学动力学简化模型的研究和比较

Keywords: 正庚烷,简化化学动力学模型,均质压燃(hcci)发动机,模型比较

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Abstract:

利用敏感性分析、主要组分分析以及准稳态假定3种方法,将含有44种组分和72个反应的skle正庚烷简化模型再简化到40种组分和56个反应;简化后的模型对滞燃期的预测结果与llnl详细模型非常接近,与激波管实验结果基本吻合,适用于hcci发动机的多维模型的计算.与其他模型比较发现,patel等人的模型缺少在低温区起关键作用的反应,即二次加氧反应(?qooh+o2?ooqooh),而tanaka等人的模型缺少了co的主要生成历程;在hcci发动机典型工况范围内,skle简化模型预测着火时刻与llnl详细模型吻合最好,tanaka等人模型和patel等人模型表现稍差,说明构建简化动力学模型时必须保证低温反应路径主干完整,同时不能忽略co的主要生成历程.

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