中国内河富淤泥库区叶轮作用引起的水流和泥沙扰动动态研究

IF 2 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers in Earth Science Pub Date : 2024-08-15 DOI:10.3389/feart.2024.1427707
Hao Wang, Yu Wang, Kaiqing Liu, Tianfeng Luo, Jinping Li, Ying Zhang, Tian Miao, Miao Tian, Zhehui Wang, Xiaolong Zhang
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引用次数: 0

摘要

导言:本研究探讨了叶轮旋转对中国高含沙内陆河流水库泥沙扰动的特征。根据相似性原则,在甘肃省兰州市建立了反映西北内陆水库典型环境条件的比例试验模型:方法:本研究综合使用 Ansys Fluent 软件进行数值模拟,并通过水力实验来证实研究结果。采用计算流体动力学(CFD)和κ-ε可实现模型模拟固液混合过程,并与实验模型进行验证:结果表明,当叶轮浸没流场深度为 1000 毫米时,叶轮速度从 2 弧度/秒提高到 8 弧度/秒,可提高底部沉积物的悬浮率。此外,随着流入速度从 0.1 米/秒到 0.8 米/秒不等,悬浮泥沙从模型出口排出的速度也在增加。将叶轮浸没深度从 600 毫米减小到 1200 毫米可减小影响底泥的最大扰动半径:通过比较软件结果和实验数据,证实了模拟的可靠性。本研究有助于深入了解中国内陆河流库区泥沙流扰动的机理,为更全面地研究这些环境下的泥沙排放奠定了基础。
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Investigating the dynamics of water and sediment disruption due to impeller action in silt-rich reservoir zones of inland waterways in China
Introduction: This study investigates the characteristics of sediment disturbance caused by impeller rotation in reservoirs of inland rivers with high sediment content in China. A scaled experimental model, reflecting typical environmental conditions of inland water reservoirs in Northwest China, was established in Lanzhou, Gansu Province, following the principle of similarity.Methods: The study integrates numerical simulations using Ansys Fluent software and corroborates the findings through hydraulic experiments. Computational Fluid Dynamics (CFD) and the κ–ε Realizable model were employed to simulate the solid-liquid mixing process, which was verified against the experimental model.Results: The results indicate that increasing the impeller velocity from 2 rad/s to 8 rad/s, while submerged at a depth of 1000 mm in the flow field, enhances the rate of bottom sediment suspension. Furthermore, the rate of suspended sediment discharge from the model outlet increased with inflow velocity ranging from 0.1 m/s to 0.8 m/s. A decrease in the impeller’s submersion depth from 600 mm to 1200 mm was found to reduce the maximum disturbance radius affecting the bottom sediment.Discussion: The reliability of the simulation was confirmed by comparing the software results with experimental data. This study provides insights into the mechanisms of sediment-laden flow disturbance in the reservoir areas of inland rivers in China and lays the groundwork for more comprehensive investigations into sediment discharge in these environments.
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来源期刊
Frontiers in Earth Science
Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
3.50
自引率
10.30%
发文量
2076
审稿时长
12 weeks
期刊介绍: Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.
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