An optimization method on managing Ranque–Hilsch vortex tube with the synergy between flow structure and performance
An optimization method on managing Ranque–Hilsch vortex tube with the synergy between flow structure and performance
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流动结构与性能协同管理 Ranque·Hilsch 涡流管的优化方法
DOI：
10.1016/j.ijrefrig.2020.12.031
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发表时间：
2021-06
影响因子：
3.9
通讯作者：
Yong Shan
中科院分区：
文献类型：
--
作者：
Xiangji Guo;Bo Liu;Jinsheng Lv;Bo Zhang;Yong Shan
本文对涡流管内流动结构与其性能协同变化的关系进行了数值研究。结果表明，旋涡管的性能差可能是由旋涡管内控制的病态流动结构造成的。提出了一种控制涡流管内流动结构的新方法，使其最适合变冷孔比工况。采用0.3<Dc/D<0.8的不同冷孔比，研究冷孔比对性能尤其是冷却性能的影响。连续改变冷孔比可以实现涡管工作性能的一个有趣而重要的特性，即当冷质量分数从0.1增加到0.9时，总温差可以是“单调减小”（当Dc/D≤0.36时）、“先增大后减小”（当0.36<Dc/D<0.72时）或“单调增大”（当Dc/D= 0.72时）。这为控制冷热流的温度和提高制冷量提供了一种有效的方法。这一特点是由于流动结构与操作条件之间有较好的协同作用，且简单易实现。此外，还提出了一种基于逆流边界分布的旋涡管流场快速初步诊断方法，为旋涡管的优化设计提供了依据。
In this paper, the relationship between the flow structures in the vortex tube and its coordinated variation of the performance is numerically investigated. It is shown that the poor performance of vortex tubes is possibly due to the morbid flow structure controlling in it. A new method of managing the flow structures inside the vortex tube to achieve best suitable to the operation condition with a variable cold orifice ratio is proposed. Different cold orifice ratios, ranging from 0.3<Dc/D<0.8, were adopted to study how the cold orifice ratio affects the performance, especially the cooling performance. An interesting and important characteristic of the operating performance of a vortex tube can be realized by continuously changing the cold orifice ratios, that is, when the cold mass fraction increasing from 0.1 to 0.9, the total temperature difference can be “monotonically decreasing” (for Dc/D ≤ 0.36), “firstly increasing then decreasing” (for 0.36<Dc/D<0.72) or “monotonically increasing” (for Dc/D= 0.72), which provides a useful method to control the temperature of cold/hot stream and also boosts the cooling capacity. This feature results from the better synergy between the flow structure and the operation conditions, which is also simple and easy to be realized. Besides, a fast and preliminary diagnosis method on the flow field of the main tube with the distribution of the reverse flow boundary is presented, and it is helpful to the optimization design of vortex tube.
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