预燃室结构参数对汽油机稀薄燃烧的影响
Effect of pre-chamber structure parameters on leanburn characteristics for gasoline engine
本文基于研究型热力学单缸机试验研究了预燃室射流点火汽油机超稀薄燃烧热效率的影响，探索了预燃室结构参数对发动机燃烧及排放的作用规律。研究中选取发动机常见最低油耗点工况2750 r/min，平均指示压力为1.05 MPa，通过调节进气量及循环喷油量改变过量空气系数，在试验所选工况及所选方案范围内的研究结果表明：预燃室结构参数对燃烧过程影响较为明显，采用射流锥角为120°、喷孔面积为6.8 mm2 的直孔的结构设计能够更为有效地提高缸内的燃烧速率，有利于抑制爆震，在超稀薄模式下燃烧稳定性较优，并有利于降低未燃碳氢（HC）、一氧化碳（CO）、氮氧化物（NOx）排放。
Influence of pre-chamber on thermal efficiency based on ultra-lean combustion was studied on a single-cylinder research engine (SCRE). The effects of the structural parameters of pre-chamber on combustion and emissions were explored. In this study, the working condition was selected which was 2750 r/min @ 1.05MPa IMEP. The excess air coefficient in the test was controlled by adjusting the intake volume and the circulation injection volume. The research results with the selected conditions and technology strategies showed that: the comparative study on the effect of the pre-chamber structural parameters on combustion showed that, the structural design of the straight hole with 120° jet cone angle and 6.8 mm2 nozzle area can improve the combustion rate more effectively in cylinder, which is conducive to the suppression of knock combustion, and it can achieve a better combustion stability and lower HC、CO、NOx emissions when using the ultra-lean combustion technology.
李钰怀;占文锋;祁宏钟;陈泓;杜家坤;江枭枭;
广州汽车集团股份有限公司汽车工程研究院,广州 511434##天津大学 内燃机燃烧学国家重点实 验室,天津 300072;广州汽车集团股份有限公司汽车工程研究院,广州 511434;广州汽车集团股份有限公司汽车工程研究院,广州 511434;广州汽车集团股份有限公司汽车工程研究院,广州 511434;广州汽车集团股份有限公司汽车工程研究院,广州 511434;广州汽车集团股份有限公司汽车工程研究院,广州 511434;
TK421.5
gasoline engine pre-chamber lean-burn Structure Parameter
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