I粉末在静止气体场中的飞行轨迹.pdfVIP

维普资讯 学兔兔 第26卷第 4期 粉末冶金技术 Vo1．26，No．4 2008年8月 Powder Metallurgy Technology Aug．2008 粉末飞行之研究 工粉末在静止气体场中的飞行轨迹 王崇琳 (中国科学院金属研究所，沈阳 110016) 摘 要： 研究了粉末颗粒绕流阻力，用幂函数拟合了双对数阻力系数 c与雷诺数R 的关系，用增量法计算 了粉末在静止气体介质中的飞行运动，叙述了采用 Fortran语言编写计算程序的框图。讨论了粉末粒度、飞行 初速、气体压力和粉末密度对飞行的影响，10～60 m细颗粒粉末开始飞行阻力高达 522～7800g。计算了不 同角度斜向飞行的轨迹，认为由于巨大的气体阻力使斜飞路程减少，这可以采用较小直径的集粉容器。 关键词：粉末；雾化；粉末飞行计算 Investigation on the flying of powder particles I Traj ectories of flying powder particles in static atmosphere W ang Chonglin (Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，China) Abstract：The relation between drag coefficient C of a body in fluid and its Reynolds numberRewas analysed by third order polynomial fit for logC and logRe． 1 flying parameters were calculated by increment method．A program was writtenby Fortran language．Different effects of particle size，initial flying velocity and angle，pressure of the atmosphere，and density of powder were discussed．The drag force can reach very high value upto 522～ 7800g for fine powder of 10——60／zm．Flying distance in horizontal direction could be shorten if flying is oblique because the huge drag force for finer particles make their velocity decreased dramatically． Key words：powder；atomization；calculation of flying powder 在雾化制粉时，液膜被介质或机械力分散成液 粉末的飞行势必受到气流的干扰，在气体雾化 滴，然后继续在容器中飞行，并冷却成粉末颗粒。在 时