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方腔斜进风对流换热分叉现象的数值研究 被引量:10
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作者 吴群刚 梁新刚 +2 位作者 陈泽敬 任建勋 过增元 《清华大学学报(自然科学版)》 EI CAS CSCD 北大核心 2000年第12期102-105,共4页
数值模拟了二维方腔两顶角狭缝集中斜进风、两底角狭缝集中出风通风方式下的流动与换热。研究表明 :即使是具有对称结构的开口系统 ,其稳定的流型也可能是不对称的 ;斜进风通风方式在进风角度小于一定值时流动存在静态分叉 ,即随计算初... 数值模拟了二维方腔两顶角狭缝集中斜进风、两底角狭缝集中出风通风方式下的流动与换热。研究表明 :即使是具有对称结构的开口系统 ,其稳定的流型也可能是不对称的 ;斜进风通风方式在进风角度小于一定值时流动存在静态分叉 ,即随计算初场的不同会得到不同的解 ;这种不对称的流动仍具有较好的流场、温度场分布均匀性以及较高的换热能力 ;在工程上对斜进风进行研究时 ,必须用全场分析的方法 ;数值计算结果与可视化实验的结果得到了较好吻合。 展开更多
关键词 开口系统 静态分叉 对流换热 数值计算 方腔 斜进风 换热能力 方式
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A hybrid ventilation scheme applied to bidirectional excavation tunnel construction with a long inclined shaft
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作者 YANG Wei-chao WANG Jian +3 位作者 DENG E LIU Yi-kang LUO Lu-sen YANG Jia 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第9期3187-3205,共19页
The breakage and bending of ducts result in a difficulty to cope with ventilation issues in bidirectional excavation tunnels with a long inclined shaft using a single ventilation method based on ducts.To discuss the h... The breakage and bending of ducts result in a difficulty to cope with ventilation issues in bidirectional excavation tunnels with a long inclined shaft using a single ventilation method based on ducts.To discuss the hybrid ventilation system applied in bidirectional excavation tunnels with a long inclined shaft,this study has established a full-scale computational fluid dynamics model based on field tests,the Poly-Hexcore method,and the sliding mesh technique.The distribution of wind speed,temperature field,and CO in the tunnel are taken as indices to compare the ventilation efficiency of three ventilation systems(duct,duct-ventilation shaft,duct–ventilated shaft-axial fan).The results show that the hybrid ventilation scheme based on duct-ventilation shaft–axial fan performs the best among the three ventilation systems.Compared to the duct,the wind speed and cooling rate in the tunnel are enhanced by 7.5%–30.6%and 14.1%–17.7%,respectively,for the duct-vent shaft-axial fan condition,and the volume fractions of CO are reduced by 26.9%–73.9%.This contributes to the effective design of combined ventilation for bidirectional excavation tunnels with an inclined shaft,ultimately improving the air quality within the tunnel. 展开更多
关键词 bidirectional excavation tunnel inclined shaft hybrid ventilation scheme computational fluid dynamics ventilation efficiency
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