【摘要】 采用线性稳定性分析的方法,得到了描述可压缩气体中的空心柱形粘性液体射流雾化机理的三维模型.对模型进行了求解,发现存在6个对射流雾化过程起控制作用的量纲一的数,它们分别是Re数、We数、气液密度比、空心柱内半径与液膜厚度比及空心柱内外气体介质对于射流运动参考系的Ma数.分析了空心柱内外气体Ma数对射流空间不稳定性的影响,计算结果表明:空心柱内外气体Ma数在射流雾化过程中总是起不稳定性的作用,它们的增大有利于射流雾化过程的实现.空心柱内部气体Ma数对射流雾化过程的影响要比外部气体Ma数影响大.气体介质的可压缩性在液体射流雾化过程中具有不稳定性的作用.更多还原

【Abstract】 Based on linear stability analysis,three-dimensional mode of annular viscous liquid jet in compressibility gas is obtained,which is used to investigate the atomization mechanisms of liquid jet.It is found that there exist six dimensionless parameters which govern the annular viscous liquid sheet atomization.These parameters are the Reynolds number,the Weber number,density ratio between the gas and liquid,the ratio of the inner radius to the thickness of the liquid sheet and the Mach numbers of the inner and outer gases with respect to the frame of reference moving annular jet.The effects of the gas Mach numbers on the spatial instability of an annular viscous liquid jet are carried out.It is shown that the Mach numbers of the gases inside and outside annulus always enhances the annular jet instability,but the inner gas Mach number has more influence on the atomization of the annular jet than the outer gas Mach number.The compressibility of the gas tends to promote instability of the liquid jet.更多还原