应用激光诱导荧光法研究超高压喷雾气液相浓度场分布特性  

Study of Concentration Distribution of Liquid and Vapor-Phase of Diesel Spray Injected at Ultra-High Injection Pressure by Planar Laser Induced Exciplex Fluorescence Technique

作　　者：孙田[1] 苏万华[1] 郭红松[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：《内燃机学报》2007年第2期97-104,共8页Transactions of Csice

基　　金：国家重点基础研究发展规划项目(2001CB209202)

摘　　要：应用复合激光诱导荧光技术在光学发动机上测量了燃油喷雾气液两相荧光图像,提出分析浓度场分布的无量纲参数,最终获得喷雾气液相浓度场相对分布。实验采用电机倒拖的光学发动机,燃烧室采用ω形BUMP燃烧室,应用自行设计的脉冲压力放大供油系统,实现了最高喷油压力达240 MPa的超高压喷射。通过研究发现,随着喷油压力提高可有效加速喷雾气相生成、促进喷雾气相的均匀分布。这种效果在有较强挤流作用和存在BUMP燃烧室限流沿剥离作用下更为明显,此时喷雾气相相对浓度随着喷油压力从160 MPa提高到240 MPa而下降62.50/0。The images of liquid and vapor-phase of diesel spray at ultra-high injection pressure were measured by planar laser induced exciplex fluorescence technique in an optical engine. The concentration distribution of liquid-phase and vapor-phase were obtained and analyzed. The chamber named as BUMP combustion chamber in experiments was to type chamber with a bump ring. The ultra-high injection pressure was realized by fuel supply system whose injection pressure could reach up to 240 MPa. The results showed that with the＇ increase of injection pressure the distribution of the vapor-phase became more uniformly. This behavior became obviously with bump ring and strong squish. Decreasing in vapor-phase normalized fluorescence intensity by 62.5% is observed when injection pressure increases from 160 MPa to 240 MPa.

关 键 词：激光诱导荧光技术 超高压喷射 燃烧室 喷雾气液相浓度场 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]