高辛烷值燃料-空气预混层流燃烧特性研究  

Study on Laminar Burning Characteristics of High Octane Fuel-Air Mixtures

作　　者：巩静[1] 金春[1] 姜雪[1] 黄佐华[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《西安交通大学学报》2009年第5期26-30,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50521604;50576070)

摘　　要：在定容燃烧弹中采用高速纹影摄像方法研究了不同当量比（φ=0．8～1．4）和初始温度（373K，423K，473K）下高辛烷值燃料-空气预混合气的层流燃烧特性，分析了当量比和初始温度对燃烧的影响．结果表明：拉伸火焰传播速率、无拉伸火焰传播速率、拉伸层流燃烧速率和无拉伸层流燃烧速率随着初始温度的增加而增加，无拉伸层流燃烧速率在φ=1．0～1．1附近有最大值；马克斯坦长度随初始温度的增加而增加，随当量比的增加而减小；燃烧压力峰值与混合气质量的比值在φ=1．1时出现最大值，初始温度增加，该比值相应增加．The laminar combustion characteristics of ETBE-ethanol-tert-butyl alcohol-air mixtures were studied at various equivalences ratios （0. 8-1.4） and initial temperatures （373 K, 423 K and 473 K） by using a constant volume combustion bomb and Schlieren photography. The influences of equivalence ratios and initial temperatures on the combustion characteristics were analyzed. The results show that the stretched flame speed, the unstretched flame speed, the stretched laminar burning speed and the unstretched laminar burning speed increase with the increase of the initial temperature. The unstretched laminar burning speed exhibits a maximum value at the equivalence ratio of 1.1. The Markstein length increases with the increase of the initial temperature and decreases with the increase of the equivalence ratio. The ratio of the peak combustion pressure to the mass of mixture shows a maximum value at the equivalence ratio of 1.1,and this ratio increases with the increase of the initial temperature.

关 键 词：高辛烷值燃料 层流燃烧速率 马克斯坦长度 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]