虹吸技术已被广泛应用于工程实际中,特别是在排除边坡地下水和降低泥石流水动力条件方面有极大的应用价值。边坡中深部地下水的排除需要采用高扬程虹吸管,但在实际使用中,高扬程自平衡虹吸管因易断流而造成虹吸排水失效。利用空化理论,系统分析了虹吸管内气泡产生的机理,并通过流体数值分析软件FLUENT发现自平衡虹吸管内气液两相流动是一个从泡状流向弹状流的转变过程。研究结果表明虹吸管内形成弹状气泡后,增加了虹吸流动中的压力降,导致管顶真空度降低,破坏水流连续性,造成虹吸断流,并影响虹吸的下次启动。
Abstract
Siphon technology has been widely used in engineering practice. It has great application value especially in draining slope’s groundwater and reducing debris flow’s hydrodynamic conditions. The drainage of groundwater in middle and deep part of slope requires the use of high-lift siphon. However, the cutoff of high-lift and self-balancing siphon causes siphon drainage failures in practical use. In this paper, we analyzed the mechanism of bubble generation in the siphon based on the cavitations theory, and employed the fluid numerical analysis software FLUENT to found that the gas-liquid two-phase flow in self-balancing siphon is from bubble flow to slug flow. After slug flow is formed in siphon, the siphon flow pressure drop will increase, resulting in the decrease of vacuum degree in the top of siphon, thus damaging the continuity of water flow and leading to interception of siphon, and finally, negatively affecting siphon’s next startup.
关键词
虹吸排水 /
空化 /
FLUENT /
弹状流 /
压降
Key words
siphon drainage /
cavitations /
FLUENT /
slug flow /
pressure drop
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参考文献
[1] 李维仁,陶柯宇.虹吸管在龙岩水库抢险中的应用[J].广西水利水电,2007,(4):52-54.(LI Wei-ren, TAO Ke-yu. Application of Siphon Pipe in Rescue of Longyan Reservoir[J]. Guangxi Water Resources & Hydropower Engineering, 2007, (4): 52-54. (in Chinese))
[2] 彭志威,刘子建,黄丹莲.水厂虹吸滤池进水流道水力特性的数值模拟[J]. 中国给水排水,2009,25(15):70-72. (PENG Zhi-wei , LIU Zi-jian , HUANG Dan-lian. Numerical Simulation of Hydraulic Characteristics of Inflow Channel in Siphon Filter [J]. China Water & Wastewater, 2009, 25(15):70-72. (in Chinese))
[3] 陈野鹰,唐红梅,周作茂,等. 三峡水库港口岸坡排水方案优化研究[J]. 水运工程,2006,(5):50-54. (CHEN Ye-ying, TANG Hong-mei, ZHOU Zuo-mao, et al. Optimization of Port Bank Slope Drainage Technique in Three Gorges Area [J]. Port ＆ Waterway Engineering, 2006,(5):50-54.(in Chinese))
[4] 张永防,张颖钧.虹吸排水应用技术的研究[J].中国铁道科学,1999,19(3):52-60. (ZHANG Yong-fang, ZHANG Ying-jun. Research on Siphon Drainage Application Technology [J]. China Railway Science, 1999, 19(3): 52-60.( in Chinese))
[5] 尤明庆, 陈小敏. 实现虹吸过程的条件[J].焦作工学院学报(自然科学版),2003,22(6):487-489. (YOU Ming-qing, CHEN Xiao-min. Study on the Condition of the Siphon Age[J]. Journal of Jiaozuo Institute of Technology(Natural Science), 2003,22(6):487-489. (in Chinese))
[6] 彭志威,刘子建,郝 涛. 管流的虹吸过程仿真及其性能控制研究[J].水科学与技术,2008,(6): 22-25.(PENG Zhi-wei, LIU Zi-jian,HAO Tao. Simulation of Siphon and Siphon Flow Control [J]. Water Sciences and Engineering Technology, 2008,(6):22-25. (in Chinese))
[7] 魏丽敏,何 群,林镇洪.考虑地下水影响的滑坡稳定性分析[J].岩土力学,2004,25(3):422-426.(WEI Li-min,HE Qun, LIN Zhen-hong. Stability Analysis of Landslide under Influence of Groundwater [J]. Rock and Soil Mechanics, 2004,25(3): 422-426. (in Chinese))
[8] 张永防,张朝林. 湘黔线K93路堑滑坡虹吸排水工点的试验研究[J].路基工程,1999,(6):26-30. (ZHANG Yong-fang, ZHANG Zhao-lin. Experimental Research on Siphonic Drainage Work Sites of the K93 Cutting Landslide in Xiangqian Line[J]. Subgrade Engineering,1999,(6):26-30.(in Chinese))
[9] 舒 群,张文德. 虹吸法排除滑坡体中的深层地下水[J].中国西部科技,2005,(6):10-13. (SHU Qun, ZHANG Wen-de. Siphon Method Discharge of Deep Groundwater in the Landside[J]. Science and Technology of West China, 2005, (6): 10-13. (in Chinese))
[10]杨 庆,张建民,戴光清,等. 空化形成机理和比尺效应[J].水力发电,2004,30(4):56-59. (YANG Qing, ZHANG Jian-ming, DAI Guang-qing, et al. Summary of Cavitation Formation Mechanism and Scale Effect[J]. Water Power, 2004, 30(4): 56-59. (in Chinese))
[11]黄景泉. 空化起始条件的确定[J].应用数学和力学,1989,10(2):155-159. (HUANG Jing-quan. Conditions for Incipient Cavitation Formation[J]. Applied Mathematics and Mechanics,1989,10(2):155-159. (in Chinese))
[12]BRACKBILL J U, KOTHE D B, ZEMACH C. A Continuum Method for Modeling Surface-tension[J]. Journal of Computational Physics,1992,100(2):335-354.
[13]《给水排水设计手册》编写组.室外给水[M] .北京:中国建筑工业出版社,1974:102. (The Editorial Committee. Outdoor Water Supply [M]. Beijing: China Architecture and Building Press,1974:102. (in Chinese))
[14]REZKALLAH K S. Weber Number Based Flow-pattern Maps for Liquid-gas Flows at Microgravity [J]. International Journal of Multiphase Flow, 1996, 22: 1265-1270.
基金
国家自然科学基金项目(41272336);“十二五”国家科技支撑计划项目(2012BAK10B06)
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