EXPERIMENTAL INVESTIGATION OF LOW TEMPERATURE DIESEL COMBUSTION PROCESSES
EXPERIMENTAL INVESTIGATION OF LOW TEMPERATURE DIESEL COMBUSTION PROCESSES
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DOI：
10.1080/00102202.2011.600740
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发表时间：
2011-01-01
影响因子：
1.9
通讯作者：
Peckham, M.
中科院分区：
文献类型：
--
作者：
Cong, S.;McTaggart-Cowan, G. P.;Peckham, M.
本文研究了柴油机低温燃烧的三个不同阶段。柴油低温燃烧遵循冷火焰-负温度系数（NTC）-高温热反应（主燃烧）过程。缸内参数，如充气温度，压力和组成，对这些燃烧阶段有显着的影响。NTC是强烈的温度依赖性，与较高的温度诱导的NTC和更快的过渡，从NTC的主要燃烧过程的早期发病。进气充量温度的增加导致了NTC的早期发生和冷火焰制度期间释放的热量减少。较高的燃料喷射压力改善了燃料混合并增强了低温（预燃烧）反应，这又导致冷火焰状态的较早出现和在该阶段期间的更多热释放。这增加了充电温度，并导致NTC制度的早期开始。较高的废气再循环（EGR）率降低了进气充氧浓度并限制了低温反应速率。这降低了冷焰反应阶段的放热速率，导致装料温度的缓慢升高和NTC状态的较长持续时间。这增加了主燃烧事件的点火延迟。与其他参数相比，喷射正时对冷焰反应速率和NTC相位的影响不太显著。但是，它对主燃烧放热过程的相位和峰值放热率有显著影响。
The work presented in this article investigates the three distinct phases of low temperature diesel combustion (LTC). Diesel LTC followed a cool flame-negative temperature coefficient (NTC)-high temperature thermal reaction (main combustion) process. The in-cylinder parameters, such as the charge temperature, pressure, and composition, had noticeable influences on these combustion stages. The NTC was strongly temperature-dependent, with higher temperatures inducing both an earlier onset of NTC and a more rapid transition from NTC to the main combustion process. An increase in the intake charge temperature led to an earlier occurrence of NTC and a reduction in the heat released during the cool flame regime. A higher fuel injection pressure improved fuel mixing and enhanced the low temperature (pre-combustion) reactions, which in turn led to an earlier appearance of the cool flame regime and more heat release during this phase. This increased the charge temperature and led to earlier onset of the NTC regime. A higher exhaust gas recirculation (EGR) rate reduced the intake charge oxygen concentration and limited the low temperature reaction rates. This reduced the heat release rate during cool flame reaction phase, leading to a slower increase in charge temperature and a longer duration of the NTC regime. This increased the ignition delay for the main combustion event. The injection timing showed a less significant influence on the cool flame reaction rates and NTC phase compared to the other parameters. However, it had a significant influence on the main combustion heat release process in terms of phasing and peak heat release rate.