热EGR氢内燃机的动力性和排放

发布时间：2018-05-18 17:57

本文选题：内燃机 + 氢内燃机　；参考：《内燃机工程》2016年01期

【摘要】：基于进气道燃料喷射(port fuel injection,PFI)氢内燃机试验系统,研究了带热废气再循环(exhaust gas recirculation,EGR)系统氢内燃机的燃烧和排放特性。试验结果表明:采用热EGR能增大氢内燃机的滞燃期和燃烧持续期,显著降低缸内最高压力和温度;EGR率增大时平均有效指示压力和循环变动的变化并不显著,对整机的功率输出和平顺工作几乎没有影响,中高负荷时需要采用很大的EGR率才能大幅度降低NOx排放,在高负荷时控制排放所需的EGR率不大,高负荷时过大的EGR率可能造成燃料经济性和动力性的大幅度下降。
[Abstract]:The combustion and emission characteristics of a hydrogen combustion engine with hot exhaust gas recirculation (EGR) system were studied based on the intake port fuel injection system. The experimental results show that the thermal EGR can increase the ignition delay and combustion duration of the hydrogen combustion engine, and decrease the average effective indicating pressure and cycle change of the hydrogen combustion engine with the increase of the maximum pressure in the cylinder and the increase of the temperature. It has little effect on the power output and smooth operation of the whole machine. In order to reduce the NOx emission greatly, it is necessary to adopt a large EGR rate when the load is medium and high, but the EGR rate required for controlling the emission at the high load is not large. Excessive EGR rate at high load may result in a significant decrease in fuel economy and power performance.
【作者单位】：北京理工大学机械与车辆学院;华北水利水电大学机械学院;
【基金】：国家自然科学基金项目(51276019) 河南省教育厅科学技术研究重点支持项目(14B470016)
【分类号】：U464.174

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