Large-scale flow structure and energy separation in a Ranque–Hilsch vortex tube with particle image velocimetry measurement: an experimental study

Shi Zheyu; Guo Xiangji; Zhang BoFu Tinghuang

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Large-scale flow structure and energy separation in a Ranque–Hilsch vortex tube with particle image velocimetry measurement: an experimental study

机译：Large-scale flow structure and energy separation in a Ranque–Hilsch vortex tube with particle image velocimetry measurement: an experimental study

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Abstract The flow structure of the vortex tube is considered to be the key to understanding the energy separation mechanism, and the unsteady vortex breakdown and precessing vortex core determine the characteristics and behaviour of the flow structure. Thus, transparent vortex tubes with a diameter of 30 mm were designed for main tube visualization, and two-dimensional (2-D) particle image velocimetry (PIV) measurement was adopted to investigate the instantaneous and time-averaged flow field on the meridian plane. The distributions of the axial velocity, radial velocity, vorticity, and, especially, the reverse flow boundaries were obtained to understand the flow structure within vortex tubes. Various operating conditions with different cold mass fractions (0.1–0.9), tube lengths (360, 600, and 900 mm), and inlet pressures (0.1 and 0.2 bar) were studied to reveal the effects of the reverse flow boundary on the energy separation performance. The large-scale flow structure of the precessing vortex core was found to be located at the reverse flow boundary, and the vortex core precession determines the mass transfer processes between the inner and outer layers. In addition, the axial velocity fields and the distributions of the reverse flow boundary captured by the 2-D PIV agree with our earlier results from 2-D laser Doppler velocimetry to a great extent, confirming the feasibility of these two laser nonintrusive measurement methods and the streamline results from our earlier LES study.Graphical abstract

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来源
《Journal of visualization》 |2023年第1期|45-59|共15页
作者
Shi Zheyu; Guo Xiangji; Zhang BoFu Tinghuang;
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作者单位

Nanjing University of Aeronautics and Astronautics;

Dalian University of Technology;

Beiting Measurement Technique Co. Ltd.;

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原文格式 PDF
正文语种英语
中图分类应用物理学;
关键词
Ranque–Hilsch vortex tube; Precessing vortex core; Energy separation; PIV; Reverse flow boundary;

Large-scale flow structure and energy separation in a Ranque–Hilsch vortex tube with particle image velocimetry measurement: an experimental study

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