脉动送风对大空间建筑室内污染物通风效率和流动分布的影响
Influence of pulsating air supply on ventilation efficiency and flow distribution of pollutants in large-space buildings
李景汁 1王海东 1刘岩2
作者信息
- 1. 上海理工大学环境与建筑学院,上海 200093
- 2. 上海外高桥造船有限公司,上海 200137
- 折叠
摘要
为提高大空间建筑室内的空气品质,将脉动送风应用于大空间喷口送风中,以CO2为示踪气体,基于实验分析喷口送风的流场特征,并以校核后的计算流体力学(CFD)模拟结果,研究脉动送风在不同振幅和周期下对大空间建筑室内污染物通风效率和流动分布的影响.研究结果表明:脉动送风的CO2浓度衰减曲线呈现波动下降的趋势,大周期脉动送风的通风效率低于定风速送风;与定风速送风相比,脉动送风可有效降低室内污染物的极大值,增强新风对室内污染物的稀释范围,喷口下方和排风口附近的污染物浓度有明显的降低;在大空间喷口送风建筑中,推荐随时间波动变化快、幅度小的小周期小振幅的脉动送风.该研究可为实际大空间通风系统优化设计提供参考.
Abstract
To improve the indoor air quality of large-space buildings,the pulsating air supply method was applied to the large-space nozzle air supply,and CO2 was used as the tracer gas.By analyzing the characteristics of the flow field of the nozzle air supply based on the experiments,the effects of pulsating air supply on the ventilation efficiency and flow distribution of pollutants in large-space buildings at different air supply amplitudes and periods were investigated according to experimentally calibrated computational fluid dynamics(CFD)simulation results.The results show that the CO2 concentration decay curve of pulsating air supply shows a fluctuating downward trend,and the ventilation efficiency of large-period pulsating air supply is lower than that of fixed-velocity air supply;however,compared with the fixed-velocity air supply,the pulsating air supply can effectively reduce the maximum of indoor pollutants,and enhance the dilution range of indoor pollutants in the fresh air,with the pollutant concentration below the nozzle and near the exhaust outlet being significantly reduced;in large-space nozzle air supply buildings,a pulsating air supply with small period and small amplitude that changes fast with time fluctuation is recommended.This study can provide reference for the optimized design of the actual large-space ventilation systems.
关键词
大空间建筑/脉动送风/CFD模拟/室内污染物/通风效率/流动分布Key words
large-space buildings/pulsating air supply/CFD simulation/indoor pollutant/ventilation efficiency/flow distribution引用本文复制引用
出版年
2024
NETL
NSTL
万方数据