柴油机高密度-快速燃烧过程数值模拟

摘要

针对柴油机升功率提高后燃烧过程的变化,应用CFD软件Fire研究燃烧子模型在柴油机高密度-快速燃烧过程模拟中的应用,利用某高升功率单缸柴油机的试验结果对WAVE喷雾破碎模型和涡团破碎(EBU)湍流控制燃烧模型的关键参数进行标定.对柴油机3 600 r/min时全负荷条件下燃烧过程进行数值模拟,仿真结果表明,缸内平均压力、指示功率和放热率与试验结果吻合良好,缸内燃油蒸发充分、温度分布均匀,验证了CFD模型模拟柴油机高密度-快速燃烧过程的有效性.%For the combustion progress changes of diesel engine with high specific power, study of submodels for combustion analysis of the high density-high speed combustion was carried out by a CFD code Fire. The key parameters of spray breakup model WAVE model and turbulence controlled combustion model eddy break-up (EBU) model were calibrated with experimental results of a single cylinder diesel. The combustion was numerated, with full load condition at constant speed of 3 600 r/min. The simulated result shows that the combustion parameters such as cylinder average pressure, indicated power and heat release rate are in well coincident with the experiment results. The fuel distribution in cylinder is a good condition, the temperature distribution is uniform. The method of CFD modeling is valid to simulate the high density-high speed diesel combustion.