贾滨,黄泽远,胡祯,等.过量空气系数和点火时刻对缸内直喷氢内燃机燃烧与排放特性的影响研究[J].内燃机工程,2025,46(2):11-18.
过量空气系数和点火时刻对缸内直喷氢内燃机燃烧与排放特性的影响研究
Effects of Excess Air Coefficients and Spark Timing on Combustion and Emission Characteristics of an In-Cylinder Direct Injection Hydrogen Internal Combustion Engine
DOI：10.13949/j.cnki.nrjgc.2025.02.002
关键词:过量空气系数  点火时刻  燃烧  排放  缸内直喷氢发动机
Key Words:excess air coefficient  spark timing  combustion  emission  in-cylinder direct injection hydrogen engine
基金项目:国家杰出青年科学基金项目（51825603）
作者单位E-mail
贾滨* 天津内燃机研究所，天津 300072 jiabin@cleanengines.com 
黄泽远 天津大学 先进内燃动力全国重点实验室，天津 300072 zy_h@tju.edu.cn 
胡祯 天津大学 先进内燃动力全国重点实验室，天津 300072 huzhen@tju.edu.cn 
周磊 天津大学 先进内燃动力全国重点实验室，天津 300072 lei.zhou@tju.edu.cn 
钟力嘉 天津大学 先进内燃动力全国重点实验室，天津 300072 zhonglijia@tju.edu.cn 
卫海桥* 天津大学 先进内燃动力全国重点实验室，天津 300072 whq@tju.edu.cn 
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摘要:基于一台缸内直喷氢内燃机三维模型，开展了过量空气系数和点火时刻对缸内直喷氢内燃机燃烧与排放的影响研究。研究结果表明：随着过量空气系数从2.5降低至2.1，缸压峰值从6.9 MPa增加到10.5 MPa，缸压峰值相位从压缩上止点后18.0°提前到了上止点后12.5°。降低的过量空气系数增大了浓混合气区域，积聚在火花塞附近及气缸壁面附近。此外，过量空气系数的降低加快燃烧速度并升高燃烧温度，导致NOx排放增加。随着点火时刻从上止点前5°提前至上止点前9°，缸压峰值从7.9 MPa 增加到9.3 MPa，缸压峰值相位从上止点后18.5°提前到上止点后14.0°。点火时刻的提前使缸内平均温度从1 900 K上升到2 050 K，导致了NOx排放增加。
Abstract:Based on a three-dimensional model of an in-cylinder direct injection hydrogen internal combustion engine， the effects of excess air coefficients and spark time on the combustion and emissions were investigated. The results showed that with the decrease of excess air coefficient from 2.5 to 2.1， the peak cylinder pressure increased from 6.9 MPa to 10.5 MPa， and the peak cylinder pressure phase advanced from 18.0° after top dead center（ATDC） to 12.5° ATDC. The decrease of the excess air coefficient increased the rich-mixture region which accumulated near the spark plug and cylinder wall. In addition， with the decrease of the excess air coefficient， the flame speed was accelerated and the combustion temperature was increased， which led to an increase in NOx emissions. With the advance of spark timing from 5° before top dead center（BTDC） to 9° BTDC， the peak cylinder pressure increased from 7.9 MPa to 9.3 MPa， and the peak cylinder pressure phase advanced from 18.5° ATDC to 14.0° ATDC. With the advance of spark timing， the average cylinder temperature increased from 1 900 K to 2 050 K， which led to an increase in NOx emissions.
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