Influence analysis of cold-tube diameter on performance of high pressure throttling vortex tube
The cold-tube diameter(Dc)is an important factors affecting the performance of the vortex tube.Based on the high-pressure throttling condition of 12 MPa,CH4 is used as the calculation fluid to establish a physical model,and Dc is changed to 36,38,40,42 and 44 mm.The results of the experiment are as follows.With the increase of Dc,the temperature of the cold-tube internal swirling gas gradually decreases,so the refrigeration effect is improved;the tempera-ture of the hot-tube external swirling gas increases first and then decreases,and it was found that the heating effect was best at Dc=40 mm.This result reflects that Dc is positively correlated with the cooling effect,but there is an optimal value for the heating effect.When Dc gradually increa-ses,the total pressure drop of the internal swirling gas gradually flattens out,which is conducive to throttling.However,when the Dc≥40 mm,the total pressure drop of the external swirling gas becomes larger,and the change is irregular,which is harmful to the service life of the regulating valve.In addition,when the Dc=44 mm,the velocity of the external swirling gas changes abnor-mally.In conclusion,the cooling and heating effect of the vortex tube can be adjusted by control-ling the Dc size according to the requirements of the working conditions.
vortex tubecold-tube diameterrefrigeration and heatingthrottling depressuriza-tionflowing analysis
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