高强，周磊,华剑雄,卫海桥.不同过量空气系数下射流点火发动机燃烧、排放和爆震特性的试验研究[J].内燃机工程,2021,42(4):8-15.
不同过量空气系数下射流点火发动机燃烧、排放和爆震特性的试验研究
Experimental Study on Combustion, Emission and Knock Characteristics of Turbulent Jet Ignition Engine Under Different Excess Air Coefficients
DOI：10.13949/j.cnki.nrjgc.2021.04.002
关键词:射流点火  过量空气系数  燃烧特性  排放特性  爆震特性
Key Words:turbulent jet ignition  excess air coefficient  combustion characteristic  emission characteristic  knock characteristic
基金项目:国家自然科学基金项目(91641203）；国家杰出青年科学基金项目(51825603）
作者单位
高强，周磊,华剑雄,卫海桥 天津大学 内燃机燃烧学国家重点实验室，天津 300072 
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摘要:基于单缸试验机研究了过量空气系数对射流点火发动机性能的影响。通过分析发动机性能曲线、缸内燃烧情况及爆震特性探究射流点火最佳运行区间，并与火花点火燃烧方式进行对比。结果表明，射流点火可以有效提升瞬时放热率并拓展发动机稀燃极限，缩短缸内混合气滞燃期与燃烧持续期，同时燃油经济性有一定提升。在稀燃条件下氮氧化物排放极低。爆震方面，随着点火提前角增大，射流火焰的多点点火效应会在缸内产生明显压力震荡，继续增大点火提前角会诱导末端混合气自燃。因此射流点火爆震缸压表现为两阶段压力震荡，爆震因子集中性高。提升过量空气系数可以降低射流点火爆震因子幅值，使发动机工作在轻微爆震或无爆震状态。
Abstract:Based on a single-cylinder test machine, the effect of excess air coefficient on the performance of turbulent jet ignition(TJI) engine was studied. The optimal operating range of TJI engine was explored by analyzing the engine performance, combustion and knock characteristics and was compared with spark ignition(SI) combustion method. The results show that TJI can effectively increase the instantaneous heat release rate, extend the lean burn limit of the engine, and shorten the ignition delay and combustion duration of the in cylinder mixture. At the same time, fuel economy can be improved. Under lean burn conditions, nitrogen oxides emissions are extremely low. In terms of knocking, as the ignition advance angle increases, the multi-point ignition effect of the jet flame will produce significant pressure oscillations in the cylinder, and continued increase will induce spontaneous combustion of the end mixture. Therefore, the TJI detonation cylinder pressure shows a two-stage pressure oscillation, and the maximum amplitude of pressure oscillation concentration is high. Increasing the excess air coefficient can reduce the amplitude of the TJI maximum amplitude of pressure oscillation, making the engine work in slight knock or no knock state.
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