Study on cycle-by-cycle variations of combustion in a natural gas direct-injection engine (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Study on cycle-by-cycle variations of combustion in a natural gas direct-injection engine (PDF)
- 发表刊物：
- J Automobile Eng
- 摘要：
- In this paper, the cycle-by-cycle variations of a compressed-natural-gas (CNG)
direct-injection (DI) engine were investigated. The results show that the CNG DI engine has a better lean burn capability, and misfire cycles and partial burn cycles exist when the engine operates at small equivalence ratio (w,0.4). Meanwhile, the indicated mean effective pressure
(IMEP) has a low value, and the high value of the coefficient of variation in the IMEP is
presented in comparison with those operating at a high equivalence ratio. Cycles with a high maximum cylinder pressure correspond to the cycles of fast burning, and parameter interdependence is observed between the maximum cylinder gas pressure and its corresponding crank angle, between the maximum rate of pressure rise and its corresponding crank angle, and between the maximum cylinder pressure and the indicated mean effective pressure. Better parameter interdependence exists between the maximum cylinder pressure and the flamedeveloping period, between the maximum cylinder pressure and the rapid-burning period, and between the accumulated heat release amount per cycle and the indicated mean effective pressure. A small variation in the flame-developing duration will lead to a large variation in the
rapid-burning duration under lean mixture combustion; the slow flame propagation speed of the lean mixture combustion is considered to lead to this phenomenon.
- 合写作者：
- Huang ZH, Liu LX, Jiang DM
- 卷号：
- 2008, 222(9): 1657-1667
- 页面范围：
- 1657-1667
- 是否译文：
- 否
- 发表时间：
- 2008-09-15