摘要
基于离散相模型(DPM)对旋芯喷嘴雾化特性进行了数值计算,本模型中液滴破碎采用泰勒相似破碎模型(TAB).利用文本采样追踪手段记录雾化颗粒特性参数分布规律,分析喷雾压力和初始喷射角对雾化特性参数的影响.研究表明:细水雾颗粒轨迹呈非正规的中空圆锥状雾炬,雾滴颗粒主要分布在雾炬外围,在雾炬中心处几乎没有.雾滴颗粒的轴向速度随着喷雾轴向距离的增大呈降低趋势;雾滴直径随着喷雾轴向距离的增大呈先减小后缓慢增大的趋势.喷雾压力越大,喷雾方向同一截面位置的雾滴直径越小;初始喷射角越大,喷雾方向同一截面位置的雾滴直径越小,但这是以缩短喷雾射程为代价的.
Based on the discrete phase model（DPM）,the atomization characteristics of spiral core nozzle was calculated numerically.In this model,the liquid droplet breakup process was analyzed with Taylor analogy breakup model（TAB）.The distribution pattern of characteristic parameters of atomization particles were recorded by using text sample tracking method and the influence of the spray pressure and initial spray angle on atomization characteristic parameters was analyzed.The investigation result showed that the trajectories of fine water mist droplet would exhibit the shape of a irregular hollow conic mist torch and the water mist particles would distribute mainly around the periphery of the mist torch,without almost any at the center of the mist torch.With increasing of axial distance of spray,the axial velocity of mist droplets would exhibit diminishing trend and the diameter of mist droplets would decrease first and then increase gradually.The greater the spray pressure,the smaller the diameter of mist droplets would be at the same cross-section of the spray.When the initial spray angle becomes greater,the diameter of mist droplets would become smaller at the cost of the reduction of spraying range.
出处
《兰州理工大学学报》
CAS
北大核心
2016年第3期51-56,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51465033)
关键词
旋芯喷嘴
液滴破碎
雾化特性
雾炬
spiral core nozzle
droplet breakup
atomization characteristics
mist torch
