基于正交试验的涡流管冷效特性分析

In order to improve the coolling effect of vortex tube, the orthogonal experimental design and the extremum difference analysis method were used to analyze the influence rule and mechanism of multivariate interaction on the performance of the vortex tube. The results show that the tube diameter ratio of the cold and hot edges has the greatest influence on the cooling effect of the vortex tube, followed by the number of nozzles, the length-diameter ratio of the hot edge tube and the deflection angle of the nozzle. For the optimal value of each parameter, the tube diameter ratio of the cold and hot edges is 0. 5, the number of nozzles is 6, the length-diameter ratio of the hot edge pipe is 5, and the deflection angle of the nozzle is 0°; the cooling temperature drop increases first and then decreases with the increase of the number of nozzles, increases with the increase of the tube diameter ratio of the cold and hot edges, and decreases with the increase of length-diameter ratio and deflection angle gradually. After the vortex tube structure is optimized, its refrigeration performance is improved significantly, and the cooling temperature drop changes obviously with the inlet pressure,which is increased by 305% at most compared with that before optimization.