对冲火焰流场的二维分布对层流火焰传播速度测量的影响  

Experimental Study of the Two-Dimensional Effect on the Laminar Flame Speed Measurements Using the Counterflow Technique

作　　者：李博[1] 田雪沁[1] 张扬[1] 张海[1] 岳光溪[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2011年第4期703-706,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50576041)

摘　　要：在φ=0.6～0.75的条件下,利用PIV测得对冲火焰的二维速度场,分析使用偏移中心线一定距离提取的轴线速度分布曲线所得到的层流火焰传播速度S_L^0与沿中心线提取的速度分布曲线得到的S_L^0之间的误差大小。实验结果表明,在弱火焰时对冲火焰速度场具有明显的二维效应。φ=0.6,偏离中心轴线5mm时,相对误差达到33%;而φ=0.75时,相对误差小于5%。因此,对于弱火焰的二维速度场,测量必须沿中心线进行。the 2-D velocity field of the counterflow was measured by using PIV with equivalence ratioφin 0.6～0.75,the deviation of laminar flame speeds obtained along the line offset 1～6 mm from the centerline and along the centerline were analyzed.The experimental results showed that if the measurement was offset from the centerline,the relative measure error might is introduced.For weakly burning flames,the two-dimensional effect was obvious;for methane/air flames atφ= 0.6, if the offset distance from the centerline is 5 mm,relative error might reach to 33%,for stronger flame（φ0.7）,the relative error was smaller,forφ=0.75 of methane/air mixtures,the relative error was less than 5%compared with the data measured along the centerline.In conclusion,for the weak flames,the measurement must be taken along the centerline for accuracy determination of the laminar flame speeds.

关 键 词：二维效应 对冲火焰 层流火焰传播速度 预混火焰 

分 类 号：TK16[动力工程及工程热物理—热能工程]