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用CFD研究潜流人工湿地集水区对其水力学性能的影响 被引量:7
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作者 范立维 海热提 卢泽湘 《化工学报》 EI CAS CSCD 北大核心 2007年第12期3024-3032,共9页
采用计算流体力学(CFD)软件Fluent(Fluent Inc.,Version6.2.16)中的多孔介质模型对潜流人工湿地进行了模拟,并引入颗粒轨道模型讨论了潜流人工湿地层式和护管式两种集水区结构对其水力学性能的影响。模拟结果表明,在考察条件下,平均停... 采用计算流体力学(CFD)软件Fluent(Fluent Inc.,Version6.2.16)中的多孔介质模型对潜流人工湿地进行了模拟,并引入颗粒轨道模型讨论了潜流人工湿地层式和护管式两种集水区结构对其水力学性能的影响。模拟结果表明,在考察条件下,平均停留时间相差不大,散度成为人工湿地水力学效能的主要影响因素。集水区为层式结构时,净化区与集水区阻力比越小,其变化对湿地水力学效能影响越大;集水区高度增加,水流散度增大,湿地水力学效能减小。集水区为护管式结构时,减小集水区宽度有利于提高湿地水力学效能和明显减小阻力比对湿地水力学效能的影响;集水区高度的增加对湿地水力学效能影响不大。与层式集水区结构相比,护管式集水区结构的潜流人工湿地水力学效能更高,而且可以通过减小集水区宽度显著提高湿地水力学效能和逐步减小阻力比对其水力学效能的影响,因此护管式集水区结构优于层式结构。 展开更多
关键词 集水区 潜流人工湿地 水力学性能 水力学效能
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Characteristic and optimization of ferrite-rich sulfoaluminate-based composite cement suitable for cold region tunnels
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作者 PENG You LI Li +5 位作者 TAN Xian-jun QIU Xin ZHENG Pei-chao XIE Jun CHEN Wei-zhong REZIWANGULI Sha-ta-er 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第8期2794-2809,共16页
To develop suitable grouting materials for water conveyance tunnels in cold regions,firstly,this study investigated the performance evolution of ferrite-rich sulfoaluminate-based composite cement(FSAC grouting materia... To develop suitable grouting materials for water conveyance tunnels in cold regions,firstly,this study investigated the performance evolution of ferrite-rich sulfoaluminate-based composite cement(FSAC grouting material)at 20 and 3℃.The results show that low temperature only delays the strength development of FSAC grouting material within the first 3 d.Then,the effect of four typical early strength synergists on the early properties of FSAC grouting material was evaluated to optimize the early(£1 d)strength at 3℃.The most effective synergist,Ca(HCOO)_(2),which enhances the low-temperature early strength without compromising fluidity was selected based on strength and fluidity tests.Its micro-mechanism was analyzed by XRD,TG,and SEM methods.The results reveal that the most suitable dosage range is 0.3 wt%−0.5 wt%.Proper addition of Ca(HCOO)_(2)changed the crystal morphology of the hydration products,decreased the pore size and formed more compact hydration products by interlocking and overlapping.However,excessive addition of Ca(HCOO)_(2)inhibited the hydration reaction,resulting in a simple and loose structure of the hydration products.The research results have reference value for controlling surrounding rock deformation and preventing water and mud inrushes during the excavation in cold region tunnels. 展开更多
关键词 ferrite-rich sulfoaluminate cement cold zone early strength synergist mechanical property MICRO-STRUCTURE pumped storage power
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