旋风中气体漩涡流的动态不稳定性数值模拟研究

IF 2.8 4区 工程技术 Q2 ENGINEERING, CHEMICAL Processes Pub Date : 2024-09-17 DOI:10.3390/pr12092002
Liqiang Sun, Jiangfei Li, Ming Xie, Maoli Man, Jianqiang Zhao, Jianfei Song
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引用次数: 0

摘要

旋风分离器内的气相流场在颗粒分离过程中起着至关重要的作用。以往的研究主要集中在该流场的稳态、时间平均特性上,而对其动态不稳定性的研究却十分有限。本研究试图通过研究旋风中气体漩涡流的动态不稳定性来填补这一空白,从而对其空间和时间维度提出新的见解。通过大涡流模拟(LES)对反向气旋中的气体漩涡流进行了数值模拟,并用热线风速计(HWA)测量了切向速度。模型的准确性通过实验数据进行了验证。结果表明,瞬时切向速度和压力的分布在气旋的不同部分表现出空间不对称和时间不稳定性。气旋中气体漩涡流的动态不稳定性是空间不对称和时间不稳定性的叠加。这些不稳定性在内部区域比外部区域更为明显。动态不稳定性产生于旋转动力学和壁面曲率的共同作用,导致漩涡中心偏心旋转,这在气旋锥体的下部尤为明显。这种不稳定性增加了瞬时参数的波动,加剧了湍流强度和细颗粒扩散,最终损害了分离效率和粒度效率。
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A Numerical Simulation Study of the Dynamic Instability of Gas Swirling Flows in Cyclones
The gas–phase flow field within a cyclone plays a critical role in the particle separation process. While previous research has primarily focused on the steady–state, time–averaged characteristics of this flow field, there has been limited investigation into its dynamic instability. This study seeks to address this gap by examining the dynamic instability of gas swirling flows in cyclones, offering new insights into their spatial and temporal dimensions. Numerical simulations were performed via large eddy simulation (LES) for the gas swirling flow in a reverse cyclone and tangential velocity was measured with a hot–wire anemometer (HWA). The model’s accuracy was validated against experimental data. The results demonstrate that the distributions of instantaneous tangential velocity and pressure exhibit spatial asymmetry and temporal instability across different sections of the cyclone. The dynamic instability of the gas swirling flow in the cyclone is the superposition of the spatial asymmetry and the temporal instability. These instabilities are more pronounced in the internal regions than the outer regions. Dynamic instability arises from the combined effects of rotational dynamics and wall curvature, leading to an eccentric rotation of the swirling center, particularly evident in the lower sections of the cyclone cone. This instability increases fluctuations in the instantaneous parameters, enhancing turbulence intensity and fine particle diffusion, and ultimately impairing both separation efficiency and particle size efficiency.
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来源期刊
Processes
Processes Chemical Engineering-Bioengineering
CiteScore
5.10
自引率
11.40%
发文量
2239
审稿时长
14.11 days
期刊介绍: Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.
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