UC知道寻牛人翻译，机器翻译的不要发上来
来源：百度知道 编辑：UC知道 时间：2024/05/18 06:30:50
PDA实验测量得到的基准件流场与数值模拟得到的冷态流场基本吻合，火焰筒头部形成回流区，有利于稳定的燃烧，在火焰筒壁面有狭小的角回流区，但是没有出现贴壁流动，流场与浓度场能够很好地匹配，头部气流压降和供水压力的提高都能显著改善雾化的效果，但是供水压力的变化对流场影响不大，气流压降的增大能增强回流强度和轴向速度；改变一级旋流器斜切孔与Y轴角度 ，斜切孔之间的旋转角度 ，对流场的影响不大，减小文氏管喉道直径，回流区宽度明显变小，并且一级旋流数的增大使得雾化变好，但是通量分布变得集中，对燃烧不利；二级进气面积的增大没有给回流区带来明显的变化，但是过强的气流对雾化造成了不利的影响；套筒角度，内径以及长度的扩大，能有效提高回流区宽度和喷雾锥角，通量也趋于均匀分布，同时套筒内径，长度的增大，雾化也随之变好；对火焰筒结构的实验研究发现，火焰筒横截面某向长度存在一个临界值，使得回流区宽度最大，并且实验中不对称的横截面结构也造成了流场和喷雾场的不对称，通量分布与流场变化趋势一致，当火焰筒横截面由方形结构转变为不对称矩形结构时，液滴雾化效果变差。
Through the numerical simulation, has determined designed experiment's rationality and the feasibility basically, and in many kinds of plan's numerical calculus result comparisons, discovered that the venturi tube throat diameter, the sleeve expansion ratio angle, the sleeve inside diameter, the influence is big with the venturi tube mix segment size as well as the flame tube structure to the flow field. the PDA experiment survey obtains the datum flow field and the numerical simulation obtains the cold clean criticality flow field tallies basically, the flame tube cephalization return flow region, is advantageous to the stable combustion, has the narrow and small angle return flow region in the flame tube wall surface, but has not appeared pastes the wall to be mobile, the flow field and the density field can match well, the forehead air current pressure drop and the water supply pressure's enhancement can obviously improve the effect which atomizes, but the water suppl