进气温度与压力对涡流管性能影响的实验

实验研究了涡流管进出口膨胀比(2~5)、节流阀开度(1~11)和进气温度(313~373K)对涡流管性能的影响,重点分析了制冷和制热温度效应随上述参数的变化规律.研究中发现:随着进口膨胀比增加,管内涡流强度增强,不同半径处气流的角速度梯度增大,涡流制冷温度效应增强10.9%,制热温度效应增强46.5%.随着节流阀开度增加,冷/热气流之间能量交换的程度提升,涡流效应增强,冷流率增大47.3%.随着进气温度增加,涡轮管性能逐步提升.实验结果表明:进气温度每增加20K,制冷温度效应平均增幅约为12%,制热温度效应平均增幅约为5%. 

Experiment on influences of inlet temperature and pressure on vortex tube's performance

Experiments were carried out to study the influences of the inlet/outlet expansion ratio (2～5),the throttle setting value (1～11) and the inlet temperature (313～373 K) on vortex tube's performance.The variation of refrigeration and heating effects was obtained along with above parameters.It was found in experiments that the performance of vortex tube was enhanced with the increasing inlet expansion ratio,promoting the in-tube vortex intensity and increasing inlet the angular velocity gradient at different radiuses.The refrigeration effect increased by 10.9 ％ and heating effect increased by 46.5 ％ separately.With the rise of throttle setting value,the degree of energy exchange between the cold/heating flow increased,the eddy effect strengthened and cold flow rate increased by 47.3 ％.The performance of the vortex tube was improved with the increase of the inlet temperature.All the results show that as the inlet temperature increases by every 20 K,the refrigeration effect at the cold side is enhanced by about 12 ％,while the heating effect at hot side is improved by about 5 ％.