冷孔板孔径及进口压力对涡流管性能影响的实验研究

Effect of Cold Plate Aperture and Inlet Pressure on Vortex-Tube Performance: An Experimental study

针对涡流管大量应用于制冷系统中,对涡流管的各项参数进行研究,寻求最佳制冷工况及参数。本文自行设计涡流管实验样机,搭建开式的涡流管实验台,以CO2为工质,在不同的进口压力(0.2~0.6 MPa)、不同的冷流率(0.2~0.9)工况下研究了5种冷孔板孔径(1.5~3.5 mm)的涡流管性能,分析冷孔板孔径对涡流管性能的影响情况。研究表明:制冷、制热效应均在0.4MPa达到峰值后出现下降,在冷孔板孔径为2.5 mm时获得最佳制冷效应29.3℃、制热温度效应37.9℃,且获得最佳制冷量及制冷性能。

The influence of the variables of interest,including the cold-plate aperture diameter,cold-mass flow fraction and inlet CO2-pressure,on the performance of lab-designed vortex-tube,a cooling/heating device,was investigated with the lab-built test platform.The results show that the variables of interest all had a major impact.To be specific,as the pressure increased from 0.2 to 0.6 MPa,the refrigeration changed in an increase-decrease mode,peaking at 0.4 MPa;as the diameter increased from 1.5 to 3.5 mm,the refrigeration varied also in an increase-decrease manner,maximizing at 2.5 mm,because the diameter and pressure strongly affected the cold-mass flow fraction.The optimal diameter and pressure were estimated to be 2.5 mm and 0.4 MPa,respectively;and the largest temperature reduction(increase) was 29.3℃(37.9℃).We suggest that the results herein reported be of some technological interest in design of vortex tube.