| 高凡， 胡卓焕， 李瑞.冷流比对涡流管内部流场影响的数值研究[J].轻工机械,2020,38(6):21-26 |
| 冷流比对涡流管内部流场影响的数值研究 |
| Numerical Study of Influence of Cold Mass Fraction on Flow Field inside Vortex Tube |
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| DOI：10.3969/j.issn.1005 2895.2020.06.005 |
| 中文关键词: 涡流管 Standard κ ε模型 流场 冷流比 滞止点 |
| 英文关键词:vortex tube Standard κ ε model flow field cold mass fraction stagnation point |
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| 中文摘要: |
| 为了探究不同冷流比对于涡流管内部流动的影响，课题组建立了涡流管的三维模型，在进气压力为0.38 MPa工况下，采用了Standard κ ε 模型对涡流管内的气体流动进行稳态数值模拟，获得了不同冷流比条件下的速度、压力以及温度变化趋势。研究结果表明：热端管内的能量分离主要集中在其前部靠近涡流室的位置，且在同一管径截面上，径向外层旋流具有更高的静压和温度；相对于低冷流比时，高冷流比的静压值和温度值更高；此外，在高冷流比时回流边界层范围进一步扩张，滞止点位置更接近于热端出口，增大了内外旋流的能量交换面积，有利于热流温度的提升，但会减弱涡流管整体的制冷效果。 |
| 英文摘要: |
| Aiming at the influence of different cold mass fraction on the internal flow of the vortex tube, a three dimensional model of the vortex tube was established. The Standard κ ε model was used to conduct a steady state numerical simulation of the internal flow field under the inlet pressure of 0.38 MPa to obtain the tendency of velocity, pressure and temperature at different cold mass fraction. The results show that the energy separations are mainly concentrated in the front part of the hot tube, which is close to the vortex chamber. The radial outer swirl has a higher static pressure and velocity on the same cross section. The static pressure and temperature values of high cold mass fraction are higher than those of low cold mass fraction. In addition, the reverse flow boundary surface extends further at high cold mass fraction, and the stagnation point is closer to the end of the hot tube, so the energy exchange area of the inner and outer swirls is increased, which is conducive to the improvement of outer flow temperature but weakens the overall cooling effect of the vortex tube. |
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