Numerical study of EGR effects on reducing the pressure rise rate of HCCI engine combustion (PDF)
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Numerical study of EGR effects on reducing the pressure rise rate of HCCI engine combustion (PDF)
- 发表刊物：
- Front. Energy Power Eng. China
- 摘要：
- The effects of the inert components of exhaust gas recirculation (EGR) gas on reducing the pressure rise
rate of homogeneous charge compression ignition engine combustion were investigated numerically by utilizing the CHEMKIN II package and its SENKIN code, as well as Curran’s dimethyl ether reaction scheme. Calculations were conducted under constant volume combustion and engine combustion (one compression and one expansion only, respectively) conditions. Results show that with constant fuel amount and initial temperature and pressure, as EGR ratio increases, combustion timings are retarded and the duration of thermal ignition preparation extends non-linearly; peak values of pressure, pressure rising rate (PRR), and temperature decrease; and peak values of heat release rate in both low temperature heat release (LTHR)
and high temperature heat release decrease. Moreover, maximum PRR decreases as CA50 is retarded. With
constant fuel amount, mixtures with different EGR ratios can obtain the same CA50 by adjusting the initial
temperature. Under the same CA50, as EGR ratio increases, the LTHR timing is advanced and the duration
of thermal ignition preparation is extended. Maximum PRR is almost constant with the fixed CA50 despite the
change in EGR ratio, indicating that the influence of EGR dilution on chemical reaction rate is offset by other factors. Further investigation on the mechanism of this phenomenon is needed.
- 合写作者：
- Chen G, Iida, Huang ZH
- 卷号：
- 2010, 4(3): 376-385
- 页面范围：
- 376-385
- 是否译文：
- 否
- 发表时间：
- 2010-09-15