摘要
要短道的通风效果直接影响竖井送排式纵向通风隧道的通风效果。通过分析短道内污染物浓度分布模型,选择短道长度与送排风量比两个因素为研究对象。采用控制变量法利用GAMBIT软件建立72组物理模型,利用FLUENT数值模拟软件,采用k-ε模型结合标准壁面函数法对短道流场进行数值模拟,分析模拟结果发现:1短道长度对回流区长度产生的影响较小,送排风量比对回流区长度的影响较大且呈正相关关系,回流区影响范围百分比(回流区长度/短道长度×100%)与短道长度呈负相关关系;2当送排风比值≥1.9,回流区长度不再显著增加;3当短道长度≥70m时,回流区影响范围百分比变化趋势逐渐趋于平缓。
The ventilation effect of short duct directly influenced on the longitudinal ventilation send and exhaust shaft tunnel ventilation effect. Through analyzing the pollutants concentration distribution model, the short duct length and the send and exhaust air volume ratio were chosen as the factors to be studied. GAMBIT software was adopted to establish the 72 groups of physical model,FLUENT software was adopted for numerical simulation, the k - epsilon model combined with the standard wall function method for turbulence characteristics of mainstream area and flow field near the wall are numerically simulated. Results showed that： （1） The impact of short duct length is smaller than the air volume ratio, and the relationship between the scope of backflow zone percentage （the length of recirculation region/short duct length×100%） and short duct length was negatively correlated;（2） When the air volume ratio≥1.9, the backflow zone length would not increase significantly; （3） When the short duct length ≥70m, the change of scope of backflow zone percentage tend to be flat.
出处
《洁净与空调技术》
2016年第2期17-21,共5页
Contamination Control & Air-Conditioning Technology
关键词
送排风竖井
污染物浓度分布模型
短道
控制变量法
k-ε模型
CFD模拟
send and exhaust shaft
pollutant concentration distribution model
Short duct
control variable method
k-ε model
CFD simulation
