柴油机高压及微孔径下燃油雾化特性的数值研究(Ⅰ)——模型参数的选取  

Numerical Study on Fuel Spray Characteristic for Diesel Engine under High Pressure and Micro-hole(Ⅰ):Selection of Model Parameters

作　　者：周磊[1] 徐春龙[1] 韩君[2] 贾明[3] 孙凯[1] 李庭蕊[1] 

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

出　　处：《车用发动机》2011年第5期6-11,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：为了更精确模拟燃油雾化过程,探求适合超高压及微孔径下的燃油雾化模型,向计算流体力学平台KI-VA—3V中加入了大涡模拟程序及相应的雾化模型,数值研究了在超高压和微孔径条件下不同雾化参数对燃油雾化蒸发过程的影响。结果显示,破碎时间常数B1值对液相和蒸气相浓度有着重要影响,且对不同的湍流模型影响程度不同;随着B1的增加,喷雾的液相和蒸气相长度都有所增加;破碎长度常数和波长常数对喷雾结构也有不同程度的影响。In order to simulate accurately the process of diesel spray, the proper diesel spray model for super high pressure and micro-hole was studied. Adding the large eddy simulation （LES） codes and corresponding spray model to KIVA-3V CFD platform, the influences of different spray parameters on diesel evaporation process at high pressure and micro-hole were researched by numerical simulation. The results show that the breakup time constant value B1 has the important influence on droplet and vapor mass fraction and has different influences on different turbulent models. With the increase of B1, the liquid and vapor length of diesel spray increase. Meanwhile, the breakup length constant value and wave length constant value have different influences on the spray structure.

关 键 词：柴油机 大涡模拟 燃油雾化 湍流模型 

分 类 号：TK421.28[动力工程及工程热物理—动力机械及工程]