| 不同管径水平管道气液两相流动数值模拟 |
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| 引用本文： | 张赫铭,李文昊,何新林,刘宁宁,金瑾.不同管径水平管道气液两相流动数值模拟[J].排灌机械工程学报,2021,39(5):488-494. |
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| 作者姓名： | 张赫铭 李文昊 何新林 刘宁宁 金瑾 |
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| 作者单位： | 1. 石河子大学水利建筑工程学院, 新疆 石河子 832000; 2. 石河子大学现代节水灌溉兵团重点实验室, 新疆 石河子832000 |
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| 摘 要： | 为更好了解管道中的气液两相流运动过程,揭示气液在不透明管道中的分布规律及运动形态,提高管道自压输水在实际工程中的安全性.基于已有研究成果,应用Fluent软件进行三维水平管道的数值模拟研究,并分析了不同管径、流速下两相流流态,及压力、流速等各项水力要素的变化.结果表明:三维CFD模拟可较好地展示管道气液两相分布规律;增大液相折算速度可以发生流型的转化,随着管径的增大,气泡流-塞状流的过渡表现为更高的液相折算速度,从80 mm管道中的小于4 m/s过渡到160 mm管道中的4 m/s;随着液相折算速度和管径的减小,由气团引起的压力波动随之减小,其中2.8 m位置处的最大压差由9 439.2,12 826.5 Pa减小到9 136.0 Pa;管道上壁面流速下降梯度高于下壁面,且气泡越大,差值越明显.工程上认为若无法避免输水过程中的气体存在,采用较小的液相折算速度和管径时,由气团引起的压力波动随之变小,认为此时管道更为安全.
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| 关 键 词： | 管道输水 管径 气液两相流 数值模拟 |
| 收稿时间： | 2020-05-08 |
Numerical simulation of gas-liquid two-phase flow in horizontal pipeline with different diameters |
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| ZHANG Heming,LI Wenhao,HE Xinlin,LIU Ningning,JIN Jin.Numerical simulation of gas-liquid two-phase flow in horizontal pipeline with different diameters[J].Journal of Drainage and Irrigation Machinery Engineering,2021,39(5):488-494. |
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| Authors: | ZHANG Heming LI Wenhao HE Xinlin LIU Ningning JIN Jin |
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| Institution: | 1. College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2. Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: | In order to better understand the flow process of gas-liquid two-phase flow in the pipeline, reveal the gas-liquid distribution law and flow pattern in the opaque pipeline, and improve the safety of pipeline self-pressure water conveyance in practical engineering. Based on the existing research results, the numerical simulation of three-dimensional horizontal pipeline was carried out by using Fluent software, and the flow pattern of two-phase flow under different pipe diameter and flow velocity was analyzed, as well as the change of various hydraulic factors such as pressure and flow velocity. The results show that the three-dimensional CFD simulation can better show the distribution of gas-li-quid two-phase in the pipeline, and the flow pattern can be transformed with the increase of the liquid conversion speed. With the increase of the pipe diameter, the transition from bubble flow to plug flow shows higher liquid phase conversion velocity, from less than 4 m/s in 80 mm pipeline to 4 m/s in 160 mm pipeline. With the decrease of liquid conversion speed and pipe diameter, the pressure fluctuation caused by air mass decreases, and the maximum pressure difference at 2.8 m position will decreases from 9 439.2 Pa and 12 826.5 Pa to 9 136.0 Pa. The gradient of velocity decrease on the upper wall of pipeline is higher than that on the lower wall, and the larger the bubble, the more obvious the diffe-rence is. It is considered that if the existence of gas in the process of water delivery cannot be avoided, the pressure fluctuation caused by the air mass will be smaller when the liquid conversion speed and pipe diameter are smaller, and it is considering that the pipeline is safer at this time. |
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| Keywords: | pipeline water delivery pipe diameter gas-liquid two-phase flow numerical simulation |
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