Analysis of influence of nozzle bias angle on energy separation effect of vortex tube
A numerical simulation of energy separation of vortex tubes with different nozzle bias angles is studied by taking ideal air as the working fluid.In addition,the distribution pattern of velocity,temperature,and pressure inside the vortex tube is analyzed.The simulation results show that the nozzles with different bias angles change the distribution of tangential and radial ve-locities in the vortex tube.With the increase of the bias angle,the axial velocity shows an in-creasing trend.The change in axial velocity affects the location of the hysteresis point,and a lar-ger axial velocity moves the hysteresis point further away from the hot end outlet.The location of the hysteresis point in the vortex tube affects the size of the interface between the cold flow and the hot flow,thus affecting the energy exchange between the two fluids.As the cold flow rate increa-ses,the cooling effect of the four vortex tubes is gradually weakened,and when the nozzle bias angle is 0°,the vortex tubes show the best cooling and heating effect.When the bias angle varies from 15 to 45°,the vortex control cooling and heating effect is gradually weakened as the nozzle bias angle increases.
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