长沙理工大学学报(自然科学版)
当量比条件下的掺氢汽油机冷启动工况三维数值模拟
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作者单位:

(长沙理工大学汽车与机械工程学院,湖南长沙 410114)

作者简介:

李岳林(1963-),男,教授,主要从事内燃机燃烧与排放控制方面的研究。

通讯作者:

李岳林(1963-),男,教授,主要从事内燃机燃烧与排放控制方面的研究。

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基金项目:

湖南省自然科学基金资助项目(2020JJ4616)


3D numerical simulation of hydrogen-gasoline engine under cold start condition with equivalent ratio
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(School of Automotive and Mechanical Engineering,Changsha University of Science & Technology,Changsha 410114,China)

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    摘要:

    为了提高传统汽油机的启动性能,同时降低启动阶段的燃料消耗率,本研究试图通过掺氢方式使汽油机在当量比条件下成功启动。采用数值模拟方式,研究了在当量比条件下掺氢汽油机冷启动工况的混合气分布与着火情况,期望找到一种更佳的掺氢汽油喷射方案。首先,构建了掺氢汽油机冷启动工况的三维数值模型,并对气门运动规律、喷油量与喷氢量的关系进行了试验标定;然后,对构建的三维数值模型进行试验验证,试验结果与计算结果吻合良好;最后,在当量比条件下进行了冷启动工况着火情况的模拟计算。研究结果表明:在当量比条件下,与纯汽油机相比掺氢能够明显加快混合气的扩散速度,使混合气更快地在缸内实现均匀分布;纯汽油启动时首循环着火困难,掺氢能实现首循环着火,但当掺氢量过大时,会出现早燃现象;掺氢能够显著减少冷启动阶段HC和CO的排放。

    Abstract:

    In order to improve the start-up performance of traditional gasoline engines and reduce the fuel consumption rate in the start-up phase,this study attempted to make the gasoline engine startup successfully under the condition of equival enceratio by adding hydrogen. The mixtured is tribution and ignition of hydrogen-gasoline engines under the condi- tion of equival enceratio were studied by numerical simulation,in the hope of finding a better hydrogen-gasoline injection solution.First,a 3D numerical model of hydrogen-gasoline engine under cold start condition was constructed,and the valve movement law and the re- lationship between fuel injection quantity and hydrogen injection quantity were calibrated. Then,the 3D numerical model was tested and verified,and the experimental results were in good agreement with the calculated results.Finally,under the condition of equivalence ratio,the simulation calculation of ignition under cold start condition was carried out.The research results show that under the condition of equivalence ratio,adding hydrogen can significantly accelerate the diffusion speed of the mixture compared with pure gasoline engines,so that the mixture can be evenly distributed in the cylinder faster.When pure gasoline is used in start-up,the first cycle ignition is difficult,while adding hydrogen can achieve the first cycle ignition.But when the amount of hydrogen is toolarge,pre-ignition will occur.Adding hydrogen can significantly reduce HC and CO emission in the cold start phase.

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引用本文

李岳林,童 鹏,张子涵.当量比条件下的掺氢汽油机冷启动工况三维数值模拟[J].长沙理工大学学报(自然科学版),2021,18(1):79-86.
LI Yue-lin, TONG Peng, ZHANG Zi-han.3D numerical simulation of hydrogen-gasoline engine under cold start condition with equivalent ratio[J]. Journal of Changsha University of Science & Technology (Natural Science),2021,18(1):79-86.

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  • 在线发布日期: 2022-02-22
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