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排灌机械工程学报
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排灌机械工程学报  0, Vol. Issue (): 5-    DOI:
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射流泵液固两相特性三维大涡模拟研究
周凌九1  袁玲丽1
(1. 中国农业大学 水利与土木工程学院,北京 100083)
LES of the Performance of Liquid-Solid Two-Phase Flow in Jet Pump
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摘要 为研究射流泵的三维液固两相流动特性,应用计算流体动力学(CFD)方法来模拟其内部流动特征。采用LES方法和混合模型对射流泵在输送固体颗粒时的基本特性进行了数值模拟,分析了不同的固体颗粒直径、固相初始浓度及流量比等参数对射流泵液固两相射流的湍射流场及射流泵基本特性的影响。结果表明,在固相初始体积分数为10%时,压力比与效率相比于单相流分别下降了28.8%与31.6%;在固相初始体积分数为20%时,压力比与效率降低了39.0%与42.2%,说明在抽吸含固体颗粒越多的液体时,液固两相射流泵的举升能力与效率越低,且随着固相初始浓度的增大,压力比和效率均降低。流量比越大,由于固相含量的份额增加,充分混合后含砂浓度将随之增加。固体颗粒直径较大,越容易产生局部浓度集中的现象,易在射流泵内形成堵塞;当颗粒直径较小时,射流泵内部浓度分布变化不大。研究结果为工程实际应用奠定了基础。
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关键词射流泵   液固两相流   混合模型   大涡模拟   流动特性     
Abstract: Large eddy simulation (LES) is used for numerical simulation of 3d liquid-solid two- phase flow in jet pump. The mixture model is adopted to treat the liquid-solid two-phase interaction. The influences of solid-phase initial volume fraction and granular diameter and flow ratio on jet pump’s characteristics are analyzed. The results show that the lifting capacity and efficiency of jet pump decrease with the increase of granule density. When the initial volume fraction of sand is 10%, the pressure ratio and efficiency of the pump decrease 28.8% and 31.6% respectively compared with that of delivering pure water. With 20% initial volume fraction, the pressure ratio and efficiency decrease 39.0% and 42.2%. After fully mixing, the volume fraction of sand increases with the flow ratio because of the increase of solid-phase portion. As the granular diameter gets greater, the granules become more prone to concentration locally. As the granular diameter gets smaller, variation of internal concentration distribution curve of jet pump becomes flatter. Research results lay a foundation for engineering application.
Key wordsJet pump   Liquid-solid two-phase flow   Mixture model   LES   Flow characteristic   
引用本文:   
. 射流泵液固两相特性三维大涡模拟研究[J]. 排灌机械工程学报, 0, (): 5-.
. LES of the Performance of Liquid-Solid Two-Phase Flow in Jet Pump[J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 5-.
 
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