稀燃条件下甲烷-空气预混射流的着火特性
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作者单位:

同济大学 汽车学院,上海 201804

作者简介:

于 洋,博士生,主要研究方向为内燃机燃烧与排放控制。E-mail: 1710978@tongji.edu.cn

通讯作者:

吴志军,教授,博士生导师,工学博士,主要研究方向为内燃机燃烧与排放控制。 E-mail: zjwu@tongji.edu.cn

中图分类号:

TK464

基金项目:

国家自然科学基金(51576141)


Lean-Burn Ignition Characteristics of Methane/Air Premixed Jet
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Affiliation:

School of Automotive Studies, Tongji University, Shanghai 201804, China

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    摘要:

    基于可控热氛围燃烧试验系统,探究射流当量比、射流速率和协流速率对甲烷-空气预混射流着火特性的影响。根据试验规律对天然气发动机稀薄燃烧的控制策略提出优化建议,以减少失火现象的发生。结果表明:随着协流温度的升高,甲烷-空气预混射流的稀燃极限降低而富燃极限升高,符合大多数碳氢燃料预混合气的着火界限分布规律。不同的射流速率和协流速率下均存在临界当量比,当低于临界当量比时,着火温度随射流当量比的升高而显著降低,当高于临界当量比时,着火温度趋于稳定。在较低的射流当量比工况(0.20 ~ 0.62)下,提高射流速率可以降低着火温度从而优化着火性能。

    Abstract:

    The effects of jet equivalence ratio, jet velocity, and co-flow velocity on the ignition characteristics of methane/air premixed jet were investigated on a controllable thermal-atmosphere combustion experimental system. According to the experimental law, the optimization suggestions for the lean-burn control strategy of natural gas engines were proposed to reduce the occurrence of the misfire. The results show that the lean limit of methane/air premixed jet decreases and the rich limit increases as co-flow temperature rises, which is consistent with the distribution of ignition limits of most hydrocarbon fuel premixes. Besides, there are different critical equivalence ratios at different jet velocities and co-flow velocities, below which the ignition temperature decreases sharply with the increase of jet equivalence ratio. Moreover, at a lower jet equivalence ratio (0.20~0.62), the improvement in jet velocity can reduce the ignition temperature and optimize the ignition characteristics.

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引用本文

于洋,瞿宗举,谢巍,邓俊,吴志军.稀燃条件下甲烷-空气预混射流的着火特性[J].同济大学学报(自然科学版),2024,52(5):815~821

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  • 收稿日期:2022-06-15
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  • 在线发布日期: 2024-05-24
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