【作者】 卢俊； 谢辉； 陈韬； 李乐； 李成；

【Author】 Jun Lu,Hui Xie,Tao Chen,Le Li,Chen Li (State Key Laboratory of Engines,Tianjin University,Tianjin 300072)

【机构】 天津大学内燃机燃烧学国家重点实验室；

【摘要】 均质压燃着火(Homogeneous Charge Compression Ignition,HCCI)作为一种高效低温燃烧方式,近年来得到广泛关注。废气重压策略是实现汽油HCCI最为实际有效的手段之一。然而着火时刻的控制是其实用化的主要困难之一,HCCI着火由化学反应动力学控制,很大程度上受到缸内残余废气中多种不完全氧化产物的影响。为探究残余废气中存留的不完全氧化产物,本文构建了实时缸内气体取样分析试验系统。测量结果显示,缸内残留的主要不完全氧化产物是短链烷烃、烯烃、炔烃、小分子醛类和醇类。并借助详细汽油替代燃料氧化机理,仿真分析了这些物质对HCCI着火的影响规律。更多还原

【Abstract】 Retaining the burnt gases is one of the most effective and practical means of achieving homogeneous charge compression ignition(HCCI).One of the challenges for the application of HCCI is the ignition control. The presence of incomplete oxidation products in the recycled burned gases affects auto-ignition significantly. The overall objective of this study is to have an insight into the chemical effects of these incomplete oxidation products in residual gas on the gasoline HCCI auto-ignition.In order to investigate the composition of incomplete oxidation products,a fast instantaneous in-cylinder sampling system was developed.The in-cylinder sample gas is extracted and analyzed.It is found that the main incomplete oxidation products in residual gas,which possibly have significant effects on the HCCI auto-ignition,are short-chain alkanes(CH4, C2H6),short-chain alkenes(C2H4,C3H6),short-chain alkynes(C2H2),aldehydes(CH2O,CH3CHO) and alcohols(CH30H,C2H50H).Chemical kinetic simulation analysis with a detailed chemical kinetic mechanism of gasoline surrogate was used to decouple and analyze the effects of these species respectively.更多还原