粉末飞行之研究——Ⅱ粉末在离心雾化风场中的飞行轨迹

Investigation of the flying of powder particles——Ⅱ trajectories of flying powder particles in wind fields of centrifugal atomization

讨论了雾化容器内风场的产生和表示法,用幂函数或指数函数描述一维风场的速度和方向,采用两步法和相对速度法编写了Fortran语言计算程序,对比了两种计算法,认为相对速度法结果更可信;计算了粉末颗粒在风场中的运动,风场对细颗粒粉末的运动影响较大,当风场较大时,细颗粒的粉末会随风场飘向远处,而风场较弱或受到抑制时,细粉则集中于雾化器中心附近;研究了细颗粒粉末在低压气体风场中的飞行,压力对颗粒飞行轨迹无影响,但因雷诺数很小,此计算结果待核实。

The paper discussed the flying trajectories of atomized powder occurring of wind field in a device and using a power or exponential functions describing the wind strength and its direction.Two calculation methods,two steps calculation and relative moving method were used to edit calculation program by Fortran language.The calculation results reveal more fine powders could be move to far distance when wind field is stronger.But it will concentrate in central area of the tank when the wind field is more faintness or retained in limited areas.