The Effect Of Inner And Outer Axial/rotate Gas Streams On Annular Liquid Sheet Stability

The research on the mechanism of the annular liquid jet rupture is helpful to understand the nature of the phenomenon of a variety of other jet fragmentation,and further realize the effective control of annular liquid jet rupture.Considering the phenomenon of annular liquid jet rupture in internal combustion engine,office equipment,agricultural irrigation,chemical and pharmaceutical process,and other fields have extremely extensive application,the study of this problem also has wide application background.Using linear stability theory,this paper respectively in time mode derives the fracture process of the viscous annular liquid sheet into the non-viscous incompressible complex air flow,the viscous annular liquid sheet into the non-viscous compressible air flow in the ? direction,and the viscous annular liquid sheet into the non-viscous compressible air flow in the ? and Z direction.This paper mainly makes the stability analysis about the fracture process of the viscous annular liquid sheet into the non-viscous incompressible complex air flow.In the first instance,the paper theoretically derives the wave dispersion relations of sinuous,varicose,Para-sinuous,Para-varicose about the mode,then defines the strength of two kinds of vortex spinning,turns it into the dispersion relation,finally according to the dispersion relations,obtained the stability limits,made the linear stability analysis.According to the dispersion relation and stability limit,this paper gets that the dispersion relations and stability limit about the fracture process of viscous annular jet are just related to the dimensionless parameters,such as gas liquid flow rate ratio ???_jz,solid vortex strength of rotation???_j,potential vortex strength of rotation???_j,the density of gas liquid ratio ??? and the liquid Weber numberlWe₁,the liquid Reynolds numberlRe₁,etc.After numerical calculation,Para-sinuous wave plays the leading role among the influences of annular liquid jet rupture in the rigid vortex mode;Para-sinuous and Para-varicose wave have no obvious differences in the potential vortex mode.In the rigid vortex mode,strengthened the inner vortex spinning strength,or weakened the outer vortex spinning strength will both prompt annular liquid jet sheet rupture;In the potential vortex mode,strengthened inner or outer vortex spinning strength will prompt annular liquid sheet jet rupture.In the complex airflow,to increasing gas liquid velocity ratio,decreasing rigid vortex gas liquid density ratio,or increasing potential vortex gas liquid density ratio,decreasing lower liquid Weber number,or increasing higher liquid Weber number,and increasing liquid Reynolds number,will prompt viscous annular sheet jet rupture.Further more,this paper derives the dispersion relations and the stability limits about the viscous annular liquid sheet into the non-viscous compressible airstreams in the swirl direction,and the viscous annular liquid sheet into the non-viscous compressible complex airstreams in the axial and swirl direction.