Although the mechanism of the energy separation in a vortex tube still remains debatable, it is well agreed that the geometrical parameters have significant impacts on its thermal performance. The present parametric experimental investigation sheds new light upon the temperature variation and energy separation in a novel convergent valveless vortex tube, whereas the performance of a straight vortex tube is additionally measured for comparison. The temperature variation and energy separation of the convergent vortex tube were observed in all the tested configurations and the convergent valveless vortex tube was found to have a better working performance with some configurations comparing with the conventional straight vortex tube. It achieved a maximum increase of 25° in the temperature variation and 32% in the coefficient of performance (COP). This implies that it is possible to reduce the cost of a vortex tube and achieve a better performance in the meantime.

尽管在涡流管中进行能量分离的机理仍然值得商,，但众所周知，几何参数对其涡流性能有重大影响。当前的参数实验研究为新型的无收敛会聚涡流管的温度变化和能量分离提供了新的思路，同时还对直涡管的性能进行了测量以进行比较。在所有测试配置中都观察到了会聚涡流管的温度变化和能量分离，发现与传统的直形涡流管相比，在某些配置下，会聚无阀涡流管具有更好的工作性能。它的温度变化最大增加了25°，而性能系数（COP）则增加了32％。