大型抽水蓄能电站长直型隧洞风尘迁移规律研究  

Wind-dust migration patterns in long and straight tunnels of large pumped storage power plants

作　　者：胡乾亮 远冠阳 张梦瑶 王为术[2] 李川 李震[2] HU Qianliang;YUAN Guanyang;ZHANG Mengyao;WANG Weishu;LI Chuan;LI Zhen(Yuanqu Pumped Storage Co.,Ltd.,Yuncheng 043700,China;College of Energy and Power Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]山西垣曲抽水蓄能有限公司,山西运城043700 [2]华北水利水电大学能源与动力工程学院,河南郑州450046

出　　处：《水资源与水工程学报》2024年第3期120-128,135,共10页Journal of Water Resources and Water Engineering

摘　　要：抽水蓄能电站地下洞室群施工存在通风难度大、风尘迁移变化规律无显著特征等难题,采用DPM气固两相流模型,针对地下洞室群中不同坡度的长直型隧洞进行数值试验研究,重点揭示了典型隧洞在不同施工条件下的风尘迁移规律及小粒径沉降粉尘分布特征。研究表明:不同区域粉尘质量浓度随风机风速的增大呈下降趋势,当风速增至21 m/s时开始升高;掌子面附近区域粉尘质量浓度随供风距离的增大呈上升趋势,当供风距离大于25 m时,风机风速不再满足隧洞内通风要求;掌子面附近区域粉尘质量浓度随隧洞坡度的增大呈显著上升趋势,通风管附近出现明显的粉尘空白带;小粒径沉降粉尘分布特征由通风管位置决定,沉降粉尘颗粒最多处位于通风管出口与掌子面之间,粒径分布较广,呈正态分布规律,在通风管出口正后方处急剧下降,并沿隧洞出口方向数量逐渐减少,平均粒径逐渐减小;流出洞外的粉尘颗粒平均粒径偏小。本研究可为抽水蓄能电站地下洞室群整体施工设计提供参考。The construction of underground cavern groups of pumped storage power plants is facing the difficulty of effective ventilation,and the wind-dust migration in the caverns shows no significant characteristics.In view of this,a gas-solid two-phase flow discrete phase model is adopted for the numerical experimental research of long and straight tunnels with different slopes in underground cavern groups,which focuses on revealing the migration rule of wind-dust and the distribution characteristics of small-size settling dust in typical tunnels under different construction conditions.The results show that the dust mass concentration in different areas decreases with the increase of the fan wind speed,and then starts to increase when the wind speed researches 21 m/s;whereas the dust mass concentration in the area near the tunnel face increases with the increase of the air supply distance,however when the air supply distance is greater than 25 m,the fan wind speed can no longer meet the ventilation requirements of the tunnel.The dust mass concentration in the area near the tunnel face increases significantly with the increase of the tunnel slope,which leads to an obvious dust blank zone near the wind duct.The distribution characteristics of small-size settling dust are determined by the wind duct position,and the most settling dust particles are located between the duct outlet and the tunnel face.The particle sizes are widely distributed in this area with a normal distribution law,and the particles decrease sharply at the right rear of the duct outlet,but gradually along the direction of the tunnel outlet,so does the average particle size.The average size of the dust particles flowing out of the tunnel is relatively small.This study can provide some reference for the overall construction design of underground cavern groups of pumped storage power plants.

关 键 词：长直型隧洞 DPM模型 风尘迁移 粒径分布 掌子面 抽水蓄能电站 

分 类 号：TV554[水利工程—水利水电工程]