基于LIBS的定容燃烧弹内乙醇直喷局部当量比测定  

Detection of Ethanol Injection Local Equivalence Ratio Based on LIBS in Constant Volume Bomb

作　　者：葛睿涵 胡二江[1] 高群飞 黄佐华[1] Ge Ruihan;Hu Erjiang;Gao Qunfei;Huang Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

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：《燃烧科学与技术》2021年第4期388-393,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51876163).

摘　　要：基于激光诱导击穿光谱,在定容燃烧弹内研究了乙醇直喷在不同喷射压力、喷射脉宽和预混喷射比下容弹中心位置局部当量比随时间的变化关系.实验结果表明,在全局当量比相同的情况下,容弹中心位置局部当量比在不同喷射压力下均随时间呈先增后减的趋势,在喷射压力越大的情况下,局部当量比增幅越大,且更快地达到最大峰值;不同喷射时间对局部当量比变化影响较小;预混比越大时,相对达到平衡所需的时间越长,但局部当量比的变化较为平缓.Based on laser-induced breakdown spectrum(LIBS),the local equivalence ratio of ethanol injection at the center of a constant volume bomb was studied under different injection pressures,injection pulse widths and premixed-injection ratios.The experimental results show that when the global equivalence ratio remained the same,the local equivalence ratio at the center of the bomb increased first and then decreased with time under different injection pressures.The higher the injection pressure,the greater the increase in the local equivalence ratio,and the faster the maximum peak value was reached.Different injection time had little influence on the change of local equivalence ratio.The larger the premix ratio,the longer the time required to reach the equilibrium,while the change of local equivalence ratio was rather gentle.

关 键 词：定容燃烧弹 激光诱导击穿光谱 直喷式发动机 局部当量比 乙醇 

分 类 号：TK31[动力工程及工程热物理—热能工程]