Computational investigation of precessing vortex breakdown and energy separation in a Ranque–Hilsch vortex tube
Computational investigation of precessing vortex breakdown and energy separation in a Ranque–Hilsch vortex tube
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DOI：
10.1016/j.ijrefrig.2017.09.010
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Xiangji Guo;Bo Zhang
中科院分区：
文献类型：
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作者：
Xiangji Guo;Bo Zhang
基于涡破裂理论，对考虑冷态质量分数影响的Ranque-Hilsch涡流管内的流动结构和能量分离进行了数值研究。考虑了9种不同冷态质量分数下的速度分布和压力场。考虑压力梯度的影响，采用准圆柱近似方法预测涡核的大小。进一步分析了大尺度涡结构在能量分离中的作用，在一定范围内增加冷态质量分数可以形成更大的涡核，从而获得更好的能量分离性能。最后，对涡破裂的类型进行了讨论，以进一步了解涡的结构。本文为外部条件（这里是冷质量分数）影响大尺度涡旋结构的方式以及随后的能量分离性能提供了新的思路。
The flow structure and energy separation considering the effect of cold mass fraction in a Ranque–Hilsch vortex tube were investigated computationally based on the vortex breakdown theory. The velocity distributions and pressure fields for nine different cold mass fractions were considered. A quasi-cylindrical approximation was adopted to predict the size of the vortex core size by considering the pressure gradient. Further, a novel analysis was conducted on the energy separation mechanism, in which the large-scale vortex structure plays an important role; for example, increasing the cold mass fraction within a certain range can result in bigger vortex cores, yielding better energy separation performance. Finally, the type of vortex breakdown was also discussed for further understanding the vortex structure. This paper offers a new idea on the manner in which the external conditions (here, cold mass fraction) affect the large-scale vortex structure and on the subsequent energy separation performance.