管曲率对Ranque-Hilsch涡流管温度分离效率的影响

S. Khan, U. Allauddin, Syed Muhammad Fakhir Hasani, R. Khan, M. Arsalan
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摘要

旋涡管将单个压缩气流分成两个独立的冷热气流,已成功地用于现场冷却和制冷。冷热流两端存在显著的温度梯度,可用于热电发电机发电。对于可能需要使用弯曲涡流管的难以进入的井下小井来说,冷热端之间的距离至关重要。涡流管的效率取决于冷热两端的温差。本文通过数值模拟研究了管曲率对温度分离效率的影响。在商业计算流体动力学软件包Ansys-fluent®中开发了直涡管和弯曲涡管的数值模型。对于弯曲管,采用多曲率角度分析了曲率对涡流管内速度场和温度场的影响。采用标准的κ−ε湍流模型来模拟三维湍流。通过控制热出口压力来改变冷流质量分数。对110°弯曲涡管的数值计算结果与已发表的实验数据进行了验证,结果吻合较好。结果表明,与直管相比,曲率对温度分离效率有积极的影响。这主要是由于弯曲涡管内多环流环的延伸和多涡的形成所导致的能量分离现象。180°和270°曲率角对涡管的影响相似,获得的最大ΔTc为15.7 K,比直涡管高约5.3%。弯曲涡旋管的温度分离ΔThc值与直管相当,150°弯曲涡旋管的温度分离最大值为25.2 K,比直管高0.8 K左右。曲率角大于150°的弯曲涡流管的温度分离效率高于直管,270°弯曲涡流管的温度分离效率最高,为8.7%。曲率对涡旋管内能量分离现象的影响一直缺乏深入的研究,本研究试图填补这一空白。这项新工作有望深入了解涡流管的能量分离机制,并为其在热电发电中的应用开辟道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effect of Tube Curvature on Temperature Separation Efficiency of Ranque-Hilsch Vortex Tube
Vortex tube that splits a single compressed gas stream into two separate hot and cold streams had been successfully used for spot cooling, and refrigeration. Significant temperature gradient exists between hot and cold stream ends that could be utilized for power generation using thermo-electric generators. Distance between hot and cold ends could be vital for small inaccessible down-hole well locations which may require the use of curved vortex tubes. Efficiency of vortex tube depends on temperature difference between hot and cold ends. In this work, effects of tube curvature on temperature separation efficiency are investigated through numerical simulations. Numerical models of straight and curved vortex tubes are developed in a commercial computational fluid dynamics package Ansys-fluent®. For the curved tube, multiple curvature angles are used to analyze the effects of curvature on velocity and temperature fields inside the vortex tube. The standard κ − ε turbulence model is used to model three-dimensional turbulence. The cold stream mass fraction is varied by controlling hot exit pressure. The numerical results for 110° curved vortex tube are validated through published experimental data and are found to be in good agreement. It is found that the curvature has affirmative results on temperature separation efficiency as compared to straight tube. This is mainly due to the energy separation phenomenon governed by the multi-circulation loop extension and multiple vortex formation in curved vortex tubes. Curvature angles of 180° and 270° have similar effects on the vortex tube where the maximum ΔTc obtained is 15.7 K which is about 5.3% higher than the straight vortex tube. The temperature separation ΔThc values for curved tubes are comparable with straight tube, the maximum being 25.2 K for the 150° curved vortex tube which is about 0.8 per higher than the straight tube. The temperature separation efficiency for curved vortex tubes with curvature angles larger than 150° is found to be higher than straigt tube, the maximum value being 8.7% for the 270° curved tube. A profound investigation of the effects of curvature on energy separation phenomenon in a vortex tube had been lacking and this research attempts to fill that gap. This novel work is expected to provide insight into the energy separation mechanisms in vortex tubes and lead the way to their use in thermo-electric power generation.
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