The main characteristics of the swirl axial and radial velocity component in addition , there also exists a tangential velocity ( rotational speed ) of the inner metal spin fluid nozzle . GuPta , who according to the attenuation characteristics of the cyclone along the flow trajectory will be divided into two categories: the first category is a continuous swirl , its spin characteristics will flow along the track

Continuing to maintain : Second category swirl attenuation , its characteristics are generated in the rotating inlet means , and then gradually decreases along the flow trajectory. Currently, the main method of generating swirl : Install cyclone, installing baffles , cut and axial flow of fluid to the injection of sudden expansion and other methods. In the air-jet spinning , whenHigh speed air jet cutting through the injection orifice twisting chamber , the flow field is formed in the nozzle is a solid attenuating high speed turbulent nozzle . In engineering applications , most researchers often use RANS method of numerical prediction of swirl . Commonly used RANS models include standard k-: turbulence model and its improved form , ko, turbulence models , algebraic stress transport model and arsenic ynolds stress transport model. In thisThese modes, standard engineering applications KEM is one of the most widely used model , however , studies have shown that this model is only the result of the cyclone is qualitatively accurate. This is mainly due to the standard k-. Anisotropic turbulence model ignores the turbulent viscosity and generate additional term due to the flow lines caused by bending . To simulate the cyclone , metal nozzle standard k-. Various correction mode turbulence model has been widely used . However , ntestinal odadadiAnd Vlachos has indicated only empirical constant correction of the standard model with a turbulence model and Lilley proposed Abujelala not accurately predict solid rotation under different nozzles . Some other researchers also proposed another correction method , Nallasamy and Sloan and put forward to improve the turbulent diffusion may be considered by the additional strain rate and flow lines due to bending to improve the standard 

The main characteristics of the swirl axial and radial velocity component in addition , there also exists a tangential velocity ( rotational speed ) of the inner metal spin fluid nozzle . GuPta , who according to the attenuation characteristics of the cyclone along the flow trajectory will be divided into two categories: the first category is a continuous swirl , its spin characteristics will flow along the track

Continuing to maintain : Second category swirl attenuation , its characteristics are generated in the rotating inlet means , and then gradually decreases along the flow trajectory. Currently, the main method of generating swirl : Install cyclone, installing baffles , cut and axial flow of fluid to the injection of sudden expansion and other methods. In the air-jet spinning , whenHigh speed air jet cutting through the injection orifice twisting chamber , the flow field is formed in the nozzle is a solid attenuating high speed turbulent nozzle . In engineering applications , most researchers often use RANS method of numerical prediction of swirl . Commonly used RANS models include standard k-: turbulence model and its improved form , ko, turbulence models , algebraic stress transport model and arsenic ynolds stress transport model. In thisThese modes, standard engineering applications KEM is one of the most widely used model , however , studies have shown that this model is only the result of the cyclone is qualitatively accurate. This is mainly due to the standard k-. Anisotropic turbulence model ignores the turbulent viscosity and generate additional term due to the flow lines caused by bending . To simulate the cyclone , metal nozzle standard k-. Various correction mode turbulence model has been widely used . However , ntestinal odadadiAnd Vlachos has indicated only empirical constant correction of the standard model with a turbulence model and Lilley proposed Abujelala not accurately predict solid rotation under different nozzles . Some other researchers also proposed another correction method , Nallasamy and Sloan and put forward to improve the turbulent diffusion may be considered by the additional strain rate and flow lines due to bending to improve the standard