地下大空间变工作区贴附送风空气分布特性  

Air Diffusion Performance of Variable Work Area Attachment Ventilation in Big Underground Space

作　　者：甘甜[1] Gan Tian(China Railway Siyuan Survey and Design Group co.,Ltd.Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《地下空间与工程学报》2024年第1期344-350,共7页Chinese Journal of Underground Space and Engineering

摘　　要：针对地下大空间环控系统能耗大以及实际中空调控制区改变的问题,在贴附送风的基础上提出适用地下大空间的变工作区贴附送风。采用数值模拟的方法,首先进行正交实验研究了等温工况下导流板与墙壁间的缝隙宽度、射流特征厚度、矩形柱跨度对流量比的影响程度大小,并通过量纲分析得出流量比q关于缝隙宽度与射流特征厚度之比x/δ_(0.5)间的关系式,即导流板的流量分配规律;其次将变工作区贴附送风与混合通风、柱壁贴附送风的空气分布特性进行了比较,研究结果显示,相比于另外两种送风方式,变工作区贴附送风可有效降低呼吸区的空气龄,并具有更好的节能效果。In view of high energy consumption of environmental control system in large underground space and the fact of changing AC working area in actual operation,based on the attachment ventilation,a variable working area attachment ventilation for large underground space is proposed.With the help of numerical simulation,an orthogonal experiment was firstly carried out to study the influence of the gap width between the deflector and the wall,the character thickness of the jet flow,and the influence of the rectangular column span on the flow ratio under the isothermal conditions.At the same time,through the dimensional analysis,the relationship between the flow ratio q and the ratio between the gap width and the jet characteristic thickness x/δ_(0.5) is obtained,that is,the flow distribution law of the deflector.Secondly,the air diffusion performance of variable working area attachment ventilation is compared with mixing ventilation and square column attachment ventilation,and the results suggest that compared to the other two air supply methods,variable working area attachment ventilation can effectively reduce the air age of the breathing area and has better energy saving effect.

关 键 词：地下大空间 变工作区 贴附送风 流量分配 空气龄 

分 类 号：TU831.1[建筑科学—供热、供燃气、通风及空调工程]