摘要
以4100QBZL-2型直喷柴油机为模拟对象,采用化学动力学计算软件CHEMKIN与LLNL的n-heptane详细氧化模型为基础,对柴油机燃用纯柴油,10%、20%、30%的水乳化柴油进行化学动力学模拟。数值模拟结果表明:水乳化柴油带来的滞燃期延长、着火滞后等现象,是乳化燃料中的水分在缸内的物理现象引起的。从纯化学动力学方面来看,掺入一定的水分可以促进H、O、OH、HO2等自由基在低温燃烧(LTC)阶段的生成,使得着火提前。通过敏感性分析可知,掺入的水分会对n-heptane氧LTC时期过氧烷基的异构化过程及过氧化氢酮的分解都会产生促进作用,从而导致n-heptane的快速分解及氧化。
Taking 4100QBZL-2 DI diesel engine as object, chemical kinetics of 10%, 20% and 30% water emulsion diesel is imitated using chemical kinetics calculation software Chemkin and LLNL＇s N-hep- tane oxidation detail model. Numerical simulation. The result shows that the physical phenomenon of the moisture of emulsion fuel in cylinder could make ignition delay longer and fire lags of water emulsified diesel oil. Mixing certain water could promote the H, O, OH, HO2 radicals generated in low-temperature combustion stage （LTC） from the view of pure chemical kinetics , which could be fired ahead of time. Sensitivity analysis reveals that the isomerization of alkyl peroxide of n-heptane in the LTC stage and re- solved hydrogen peroxide could be produced acceleration by mixing water which also make n-heptane rap- id decomposition and oxidation.
出处
《昆明冶金高等专科学校学报》
CAS
2013年第1期6-11,共6页
Journal of Kunming Metallurgy College
