喷嘴流道数对涡流管内部温度、压力分布的影响

Influence of Nozzle Flow Path Number on Temperature and Pressure Distributions of Vortex Tube:A Simulation Study

以理想CO_2气体为工质,采用Standard k-ε湍流模型,对涡流管能量分离效应进行数值模拟,分析了管内流体总温、总压的分布。在此基础上,探究了进口温度为298.15 K、进口压力为6.5 MPa、冷流率为0.1时,喷嘴流道数对涡流管内总温、总压分布以及能量分离性能的影响。模拟结果表明:喷嘴流道数在2-6范围内变化时,轴向上:总温、总压先减小后增大、径向上:总温、总压先减小后增大,制冷温度效应先增大后减小,当喷嘴流道数为3时具有最佳制冷制热温度效应。

The energy separation by a vortex tube,with ideal CO2 gas medium,was mathematically formulated with a standard k-ε turbulence model and numerically simulated.The influence of the nozzle flow path number on the flow field profiles and energy separation was investigated under the conditions,including an inlet temperature of 298.15 K,an inlet pressure of 6.5 MPa and a cold flow rate of 0.1.The simulated results show that the nozzle flow path number significantly affects the refrigeration and heating of the vortex tube.For example,as the flow path number increases from 2 to 6,both the axial/radial temperature and pressure distributions change in a decrease-increase manner,resulting in an increase-decrease variation of refrigeration.An optimized nozzle flow path number of 3 accounts for the most effective refrigeration and heating of the vortex tube.