旋流器安装角对低旋流燃烧流场的影响  

Effect of Vane Setting Angle of Swirler on Flow Field of a Low-swirl Burner

作　　者：尹航[1] 戴韧[1] 张建辉[1] 钟仕立[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《动力工程学报》2011年第9期664-671,共8页Journal of Chinese Society of Power Engineering

基　　金：上海市重点学科建设项目资助(J505011)

摘　　要：分别采用粒子速度影像(PIV)技术和数值模拟方法研究低旋流燃烧器出口下游冷态流场,分析旋流器安装角对低旋流流动结构的影响.结果表明:旋流器安装角与流场中产生回流区时的临界旋流数无关,高旋流与低旋流的分界点约为0.47;安装角较大的旋流器下游流场的发散角和低速区较大;随着轴向距离增大,中心轴线上无量纲轴向速度衰减很快,并且两个旋流器的衰减速率基本相当,左右有两个峰值,安装角较大的旋流器两个峰值衰减速率较大并且峰值之间的距离增大幅度较大;径向速度随着中心射流流速的增大而增大,安装角较大旋流器的径向速度较小;旋流器安装角为40°时后方的流场具有较高的湍动能,火焰传播速度更高.Particle Image Velocimetry （PIV） technology and numerical simulation were respectively used to investigate the the non-reacting flow flield in the downstream of a low swirl burner, while the influence of relevant vane setting angle on the flow flield analyzed. Results show that the vane setting angle has noth ing to do with the critical swirl number when the recireulation zone appears in the flowfield, of which the critical point between high and low swirl flow is about 0.47. Larger divergence angle and wider low-speed area form downstream the swirler with bigger vane setting angles. Dimensionless axial velocity decays quickly along the axial direction, and for swirlers with different vane setting angles, the velocity decrement ratios are almost the same; for swirlers with larger vane setting angles, the right-left two velocity peaks weaken rapidly and the distance between the two peaks widen quickly. Radial velocity increases with rising central jet velocity and reducing vane setting angle. Flow field of higher turbulent kinetic energy appears downstream the one of 40 setting angle, which results in quicker flame propagation.

关 键 词：旋流器 安装角 旋流燃烧器 旋流强度 旋流数 雷诺应力湍流模型 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]