内燃机燃烧压力振荡对燃烧过程影响的模拟研究  

Simulation of Combustion Pressure Oscillation Effect on Combustion Process in Internal Combustion Engine

作　　者：舒歌群[1] 卫海桥[1] 韦静思[1] 陈昕巍[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《燃烧科学与技术》2007年第5期383-388,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金(50476065);天津市自然科学基金(07JCYBJC03700);高等学校博士学科点专项科研基金

摘　　要：结合可视化发动机、高速摄影和激光剪切干涉测量设备拍摄的燃烧过程照片和获得的燃烧二维温度场,建立了燃烧室空腔模型,并将空腔声学模型划分为未燃区和已燃区,通过空腔声模态和瞬态响应研究,获得了燃烧室空腔在多点激励下的声场变化情况,结果表明,燃烧室空腔在多点激励下在未燃区产生局部压力集中现象,燃烧压力振荡可能是引起燃烧过程未燃区出现局部自燃现象的根本原因。The combustion chamber cavity sound model was built up and then partitioned into unburned and burned regions by combining the photos of the combustiort process with the combustion temperature fields, which were obtained respectively through high speed photography and laser shearing interferometry. By studying the cavity sound mode and the transient response of cavity sound model, the changes of the combustion chamber＇s sound fields with multipeint excitation were also obtained. The results show that unbumed region has pressure concentration in combustion chamber cavity which is excited by multipeint. Combustion pressure oscillation is the possible reason causing local auto-ignition of unburned region in combustion process.

关 键 词：压力振荡 声模态 自燃 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]