摘要
采用粒子图像测速技术对钝体燃烧器出口下游流场进行了测量,比较分析了冷、热态流动结构以及速度对流场特性的影响.结果表明:钝体燃烧器冷、热态流动特性具有明显差异:冷态流场属于环流主导型,中心轴线上有前、后两个滞止点;而热态流场表现为射流主导型结构,并且随着中心射流流速的增大射流的主导作用增大,中心轴线上没有出现滞止点,并且中心轴线上速度最小值随着中心射流流速增大而减小且接近燃烧器出口,随着速度比的增大而增大且远离燃烧器出口;冷态条件下靠近燃烧器出口处湍动能较大,热态条件下燃烧器下游的湍动能较大,速度较高的工况具有较大的湍动能.
Using particle image velocimetry（PIV） technology,the flowflield behind a bluff-body burner was studied,during which the divergence between its non-reacting and reacting flow structure was compared,while the influence of velocity on the flow characteristics analyzed.Results show that obvious difference exists between flowfields of above two states.The non-reacting flowfield is characterized by the domination of annular jet and two stagnation points occur along the central axis.The reacting flowfield is dominated by central jet and the domination becomes stronger with the increment of central jet velocity;no stagnation points occur along the central axis;with the rise of central jet velocity,the minimum velocity along the central axis reduces and the occurance place goes closer to the exit of burner,whereas with the rise of velocity ratio,the variation tencendy is quite the oppiste.Turbulent kinetic energy reaches a high value near the exit of combustor at non-reacting state,which gets to a peak behind the exit at reacting state.Higher turbulent kinetic energy appears in cases with higher velocities.
出处
《动力工程学报》
CAS
CSCD
北大核心
2012年第2期101-105,111,共6页
Journal of Chinese Society of Power Engineering
基金
上海市重点学科建设项目资助(J505011)
