辐射传热空间非均匀性对燃油雾化的影响

Effect of Radiation Heat Transfer Space Non-Uniformity on in-Cylinder Fuel Atomization in Diesel Engine

将整个燃烧室部件(气缸盖-气缸套-活塞组-润滑油膜)作为一个耦合体,在对耦合体进行三维传热数值模拟的基础上,利用分区求解、边界耦合法建立缸内工作过程与燃烧室部件的三维耦合计算模型,并利用离散传递法实现缸内辐射传热与燃烧室部件的耦合三维仿真模拟,以此考察燃烧室部件辐射传热空间非均匀性对缸内燃油雾化的影响。结果表明,辐射换热的空间非均匀性对燃油雾化效果会产生重要影响,在喷雾后期影响效果更为明显。对燃油雾化的影响必然会造成燃烧的差异,从而影响缸内气体温度、排放和燃烧产物。

Combustion chamber components（cylinder head-cylinder liner-piston assembly-fuel film） were treated as a coupled body.Based on the three-dimensional numerical simulation of heat transfer of the coupled body,the multi-dimensional simulation computation coupling flow and solid on working process and combustion chamber components of internal combustion engine was performed using Discrete Transfer Radiation Model（DTRM） radiation heat transfer model,zoning solution method and boundary coupling method.The simulation was applied to the influence investigation of the space non-uniformity in radiation heat transfer among combustion chamber components on in-cylinder fuel atomization.The results show that the space non-uniformity in radiation heat transfer among the combustion chamber components has great influence on fuel atomization.The effect of radiation heat transfer space non-uniformity of combustion chamber components enhances at the later stage of combustion.The effect on fuel atomization was bound to differences in combustion,therefore influences temperature of gas in cylinder,combustion and exhaust products.