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| Abnormal combustion risk assessment of hydrogen internal combustion engine based on AHP-entropy method |
Zhen-zhong YANG( ),Jia-kai WU,Jian-lun XU,Zi-dong BU,Bao-liang ZHANG,Ming-hao WANG |
| School of Mechanical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China |
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Abstract An abnormal combustion risk coefficient model was constructed based on the analytic hierarchy process (AHP) to comprehensively evaluate the abnormal combustion risk of port fuel injection (PFI) hydrogen internal combustion engine. The effects of hydrogen injection parameters on the indicator layer (abnormal combustion characteristic parameters) and the target layer (abnormal combustion risk coefficient) were investigated respectively. The results showed that by changing the hydrogen injection parameters, the maximum amount of residual hydrogen in intake port decreased by 33.4% to 41.6%. The possibility of backfire was reduced significantly. When the hydrogen injection angle was 30°?45° and the hydrogen injection flow rate was 4.36?4.96 kg/h, the in-cylinder mixture uniformity coefficient was large. The hydrogen injection parameters were favorable for organizing the combustion, but the hydrogen injection parameters could not ensure that parameters such as the incandescent area temperature were at a low level. The constructed abnormal combustion risk coefficient model could combine several characteristic parameters for effective assessment of abnormal combustion risk of hydrogen internal combustion engines. When the hydrogen injection angle was 45° and the hydrogen injection flow rate was 4.96 kg/h, all the characteristic parameters were in a reasonable range. The abnormal combustion risk coefficient decreased by 3.6% to 6.8% and the possibility of abnormal combustion was reduced.
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Received: 08 December 2021
Published: 02 December 2022
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| Fund: 中原英才计划项目（育才系列）(ZYYCYU202012112); 河南省高层次特殊人才支持“中原千人计划”领军人才项目（ZYQR201810075） |
基于层次分析-熵值法的氢内燃机异常燃烧风险评估
为了综合评估进气道喷射（PFI）氢内燃机异常燃烧风险，基于层次分析法（AHP）构建了异常燃烧风险系数模型,分别探究喷氢参数对指标层（异常燃烧特征参数）及目标层（异常燃烧风险系数）的影响. 结果表明：通过改变喷氢参数，可以使进气道残余氢气量下降33.4%~41.6%，显著降低了回火的可能性. 当喷氢角度为30°~45°、喷氢流量为4.36~4.96 kg/h时，缸内混合气均匀性系数较大，有利于组织燃烧，却不能保证炽热区域温度等参数处于较低水准. 所构建的异常燃烧风险系数模型能够结合多个特征参数对氢内燃机异常燃烧（早燃及回火）风险进行有效评估. 当喷氢角度为45°、喷氢流量为4.96 kg/h时，各项特征参数均处于合理区间，异常燃烧风险系数下降了3.6%~6.8%，降低了异常燃烧的可能性.
关键词：
氢内燃机,
层次分析-熵值法,
喷氢参数,
早燃,
回火
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