Effects of top land widths and operating conditions on exhaust hydrocarbon emissions in a spark ignition engine (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Effects of top land widths and operating conditions on exhaust hydrocarbon emissions in a spark ignition engine (PDF)
- 发表刊物：
- J Automob Eng
- 摘要：
- In this paper, the formation mechanisms of unburnt hydrocarbons in the cylinder of a spark ignition engine are investigated and the effects of various top land crevice widths, engine speeds, air-fuel ratios and spark advance angles on engine exhaust hydrocarbons are investigated. The effects of engine top land crevice width on power output and fuel economy are also analysed. It is shown that the optimum engine top land crevice width is 0.32 mm (1.3 times the two surface quench distances), thus the flame can get into the bottom of the crevice and burns out all of the accumulated unburnt hydrocarbons in it, consequently the engine exhaust hydrocarbons can be greatly reduced by 35-50 percent with less penalty on engine power output and fuel economy (0.5-1.5 per cent loss in power output and 1 similar to 3 per cent increase in fuel economy).
- 合写作者：
- Huang ZH, Pan KY, Zhou LB
- 卷号：
- 210(D3):243-247
- 页面范围：
- 243-247
- 是否译文：
- 否
- 发表时间：
- 1996-06-15