带不同漩涡的螺旋环形流的稳定性和内部流动机制分析

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-07-04 DOI:10.1016/j.expthermflusci.2024.111263
Haoyu Wang, Yang Yang, Bin Yang, Yu Tang, Wenjie Jing
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引用次数: 0

摘要

现代工业中广泛使用管道内的螺旋环形流,漩涡器是产生这种流动模式的关键部件。漩涡器的结构对螺旋环形流的产生和稳定性有很大影响。本研究从以往的研究中选取了四种性能优异的不同漩涡结构,并通过视觉图像处理和数值模拟对其特性进行了分析。通过使用概率密度函数分析不同工况下环形漩涡流液膜的波幅信息,发现漩涡器 A(平叶片漩涡器)和漩涡器 B(带轮毂的平叶片漩涡器)在环形漩涡流液膜中产生的波动较小,与性能较差的漩涡器 C(弧叶片漩涡器)和漩涡器 D(螺旋叶片漩涡器)相比,稳定性更好。结合数值模拟结果和对漩涡器内部机理的分析,发现在漩涡器 A 和漩涡器 B 中,漩涡器叶片之间的流体经历了较大的压力梯度,在此压力梯度下产生了 "跳跃 "和 "拉动 "等现象。这反过来又促使流体在离开漩涡器后产生更大的切向速度和径向压力梯度。由于漩涡器结构的影响,漩涡器 A 和漩涡器 B 并没有将流体区域完全分离成四个独立的空间。相反,在漩涡器后部的中央连接区域,气相成分聚集较早,极大地促进了螺旋环形流的下游生成。该研究分析了漩涡器内部的两相流动过程和机理,填补了以往研究的空白,为漩涡器的优化和选型提供了重要参考。
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Analysis of stability and internal flow mechanisms in spiral annular flow with different swirlers

Spiral annular flow within ducts is widely utilized in modern industry, with the swirler serving as a critical component in generating such flow patterns. The structure of the swirler significantly influences the generation and stability of the spiral annular flow. This study selected four different swirler structures with outstanding performance from previous research and analyzed their characteristics through visual image processing combined with numerical simulations. By analyzing the amplitude information of the wave fluctuations in the annular swirling flow liquid film under different operating conditions using probability density functions, it was found that the swirler A(Flat-vane swirler) and swirler B(Flat-vane swirler with hub) produced smaller fluctuations in the annular swirling flow liquid film, indicating better stability compared to the swirler C(Arc-vane swirler) and swirler D(Spiral-vane swirler), which exhibited poor performance. Combining the numerical simulation results with the analysis of the internal mechanism of the swirlers, it was discovered that within the swirler A and swirler B, the fluid between the swirler vanes experienced a larger pressure gradient, resulting in phenomena such as “jump” and “pull” under this pressure gradient. This, in turn, contributed to the generation of greater tangential velocity and radial pressure gradient after the fluid exited the swirler. Due to the influence of the swirler structure, the swirler A and swirler B did not completely separate the fluid region into four independent spaces. Instead, in the central connection area of the rear section of the swirler, the gas phase components aggregated earlier, greatly promoting the downstream generation of spiral annular flow. This study analyzed the two-phase flow process and mechanism inside the swirler, filling a gap in previous research and providing important references for the optimization and selection of swirlers.

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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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