柴油、生物柴油、戊醇混合燃料喷雾特性的实验  

Experiments on spray characteristics of diesel-biodiesel-pentanol fuels

作　　者：李莉 李雁飞 秦颂 LI Li;LI Yanfei;QIN Song(Department of Mechanical Engineering,Xi’an Jiaotong University City College,Xi’an 710018,China;State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)

机构地区：[1]西安交通大学城市学院机械工程系,西安710018 [2]汽车安全与节能国家重点实验室,清华大学,北京100084

出　　处：《汽车安全与节能学报》2021年第4期587-595,共9页Journal of Automotive Safety and Energy

基　　金：西安交通大学城市学院重点项目(202002Z2);横向项目“新型燃料的喷雾光学诊断和燃烧模式研究”(KY2020-36)。

摘　　要：为实现燃料与发动机协同优化,探究燃料物性、喷射压力、环境背压、环境温度对宏观和微观喷雾特性的影响。基于定容燃烧弹,采用高速摄影和相位Doppler粒子测试技术(PDPA),对比分析了柴油、生物柴油、戊醇及其混合燃料的喷雾特性。结果表明:与柴油相比,生物柴油液相贯穿距最大,锥角最小;戊醇液相贯穿距最小,混合燃料介于其中。随喷油压力从40 MPa提高到120 MPa,燃油Sauter平均直径(SMD)降低,随背压的增大而增大;生物柴油SMD最大,戊醇SMD最小;燃料的密度、粘度、沸点和表面张力等物性是影响喷雾特性的重要因素,且高温(830 K)时影响更显著;因此,燃料物性融合可改善喷雾特性。This paper investigated the macroscopic and microscopic spray characteristics of diesel,bio-diesel,n-pentanol,and their oxygenated blends by using high-speed photography and Phase Doppler Particle Analyzer(PDPA)for fuel-engine co-optimization.Conducted some experiments in a constant volume vessel to investigate the effects of fuel property,injection pressure,ambient pressure,and ambient temperature.The results show that compared with diesel,bio-diesel has larger liquid phase penetration and smaller cone angle;And n-pentanol has the smallest liquid phase penetration;The Sauter mean diameter(SMD)of fuel sprays decreased with the increase of injection pressure from 40 to 120 MPa and the decrease of ambient pressure.Among all the fuels,bio-diesel has the largest SMD while n-pentanol exhibits the smallest SMD due to its low viscosity and surface tension.Density,viscosity,boiling point,and surface tension are identified as the key fuel properties affecting the spray characteristics,especially in high temperature conditions(830 K).Therefore the fuel physicochemical property complementation improves spray characteristics.

关 键 词：发动机混合燃料 生物柴油 戊醇 喷雾特性 相位Doppler粒子测试技术(PDPA) 物性融合 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]