自燃临界温度区域内柴油喷雾燃烧特性模拟研究

Numerical Study on Combustion Characteristics of Diesel Spray Crossing the Critical Temperature Range

摘要:

采用条件矩封闭模型（CMC）与三维计算流体力学（CFD）软件相耦合，建立了活化热氛围中的柴油喷雾燃烧模型，分析了燃料自燃临界温度随环境压力的变化，并对临界温度附近区域的柴油喷雾燃烧特性进行了研究。结果表明，随着环境压力的增加，自燃临界温度基本维持在1048K附近。在模拟条件下，当协流温度接近临界温度时，2K的协流温度变化即可引起火焰温度及OH、H、HO2等中间组分的分布产生较大变化，进而对燃烧过程产生较大影响。

Abstract:

Conditional moment closure (CMC) model was coupled with the computer fluid dynamics (CFD) software to establish the combustion model of diesel spray in active thermo-atmosphere, the effect of ambient pressure on auto-ignition critical temperature was analyzed, meanwhile the combustion characteristics of diesel spray crossing the critical temperature range were studied. The results show that as the ambient pressure increases, the critical temperature remains around 1048K, in simulation conditions, when the co-flow temperature gets close to 1048K, 2K's co-flow temperature changes can greatly influence the flame temperature and the distribution of active components such as OH, H, HO2 etc.