柴油机高压及微孔径下燃油雾化特性的数值研究(Ⅱ)——湍流模型对燃烧的影响  

Numerical Study on Fuel Spray Characteristic for Diesel Engine under High Pressure and Micro-hole(Ⅱ):Influence of Turbulent Model on Combustion

作　　者：周磊[1,2] 贾明 李云广[1] 韩君[4] 徐春龙[1] 

机构地区：[1]中国北方发动机研究所,山西大同037036 [2]清华大学热能系,北京100084 [3]大连理工大学能源与动力学院,辽宁大连116024 [4]中北大学机电工程学院,山西太原030051

出　　处：《车用发动机》2012年第3期26-31,共6页Vehicle Engine

基　　金：国家自然科学基金项目(50806008);国家重点基础研究发展计划项目资助(2007CB210002)

摘　　要：为了有效模拟燃油燃烧过程,向计算流体力学平台KIVA-3V中加入了大涡模拟程序,同时耦合了化学反应动力学软件Chemkin,建立了喷雾燃烧过程的大涡模拟燃烧平台。研究了在高压和微孔径条件下两种湍流模型对燃油雾化燃烧过程的影响,同时对1台Caterpillar 3401重型柴油发动机缸内燃油喷雾燃烧过程进行了数值研究。结果显示,大涡模拟得到的燃油的燃烧过程与试验结果较为接近,燃烧温度分布及缸内压力变化趋势都要好于雷诺平均模型。In order to model accurately the process of diesel combustion,the influence of the turbulent models on combustion was studied.In this paper,large eddy simulation(LES) model and Chemkin soft ware were added in the CFD code KIVA-3V, and the numerical computation platform of LES and turbulent combustion were established.Numerical study has been carried out on the effect of the turbulent models on the diesel spray and combustion process at high injection pressure and micro-hole and on the spray and combustion in the Caterpillar 3401 heavy diesel engine.The results show that the process of spray and combustion with LES model is agreement with the experiment result.And the combustion temperature,ignition timing and pressure variations using LES model are better than RANS model.

关 键 词：柴油机 大涡模拟 燃油雾化 湍流模型 燃烧过程 数值模拟 

分 类 号：TK421.43[动力工程及工程热物理—动力机械及工程]