LES study on the working mechanism of large-scale precessing vortices and energy separation process of Ranque-Hilsch vortex tube
LES study on the working mechanism of large-scale precessing vortices and energy separation process of Ranque-Hilsch vortex tube
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Ranque-Hilsch涡管大尺度进动涡工作机理及能量分离过程的LES研究
DOI：
10.1016/j.ijthermalsci.2020.106818
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发表时间：
2021-05
影响因子：
4.5
通讯作者：
Shan Yong
中科院分区：
文献类型：
--
作者：
Guo Xiangji;Zhang Bo;Shan Yong
本文采用大涡模拟模型（LES）对Ranque-Hilsch涡流管中的大尺度旋进涡和能量分离进行了分析。通过比较激光多普勒测速数据与数值计算结果的时均轴向速度场，验证了大涡模拟模型的可行性。二维瞬态流场呈现出冷端二次环流和管内旋进涡两种涡结构。同时还揭示了轴向和径向两种相反的流动，反向流动所形成的旋进涡转向主流。在此基础上，首次利用涡识别方法获得了涡流管内的三维相干结构。涡管内的基本涡结构由涡体、脱体涡和破碎脱体涡组成。通过三维旋涡结构的演化，发现脱体旋涡经历了一个生长、脱落、破碎和消失的生命周期。旋进涡在旋涡脱落过程的作用下，克服了径向压力梯度的不利影响，推动部分回流从低压区流向高压区。通过这些过程，建立了涡核进动，驱动了回流边界附近气体粒子的往复运动，并通过热泵循环将能量从内层传递到外层。
In this paper, a large eddy simulation model (LES) was adopted to analyse the large-scale precessing vortices and energy separation in a Ranque–Hilsch vortex tube. By comparing the time-averaged axial velocity field between the Laser Doppler velocimetry data and the numerical results, the feasibility of the LES model was confirmed. The 2D instant flow field presents two vortex structures of secondary circulation flow at the cold end, and precessing vortices inside the tube. It also reveals two opposite flows in the axial and radial directions, and the precessing vortices formed by the reverse flow turn towards the main flow. Then, the 3D coherent structure inside the vortex tube was obtained by the vortex identification method for the first time. The basic vortex structure inside the vortex tube consists of the vortex body, detached vortex, and fragmentised detached vortex. Through the evolution of the 3D vortex structure, it was found that the detached vortices experienced a life cycle of growth, shedding, fragmenting, and vanishing. Benefitting from the vortex shedding processes, the precessing vortices overcame the adverse radial pressure gradient and drove part of the reverse flow towards the main flow from the low-pressure zone to the high-pressure zone. Through these processes, the vortex core precession that drives the reciprocating motion of the gas parcels near the reverse flow boundary was established, and energy could be transferred from the inner layer to the outer layer through a heat pump cycle.
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影响因子：
3.9
作者：
Xiangji Guo;Bo Zhang;Ling Li;Bo Liu;Tinghuang Fu
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影响因子：
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作者：
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影响因子：
7.4
作者：
Gui, Nan;Cen, Kefa;Fan, JianRen;Chen, Song
通讯作者：
Chen, Song
影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.ijrefrig.2017.09.010
发表时间：
2018
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
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作者：
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通讯作者：
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