为探明太阳能烟囱用于城市隧道自然通风及火灾排烟的效率,采用数值模拟方法,研究烟囱高度、空腔间隙、太阳辐照度和火源功率对通风与排烟效率的影响规律。研究得出：隧道自然通风速率随烟囱高度、空腔间隙和太阳辐照度增加而上升,烟囱高度每增加1.4 m通风速率提高17%,空腔间隙每增加0.5 m通风速率提升16%,太阳辐照度增加200 W/m2通风效率提高11%。太阳能烟囱用于排烟的效率优于传统竖井,烟囱高度对排烟效率的影响较小,排烟空腔间隙临界值为1.5 m。基于太阳能烟囱内横向非对称抛物线温度分布,提出烟囱出口体积流量预测模型。
Abstract
To investigate the efficiency of solar chimney for natural ventilation and fire smoke extraction in urban tunnels, numerical simulation was used to study the effect of chimney height, cavity clearance, solar radiation intensity and fire power on the ventilation and smoke extraction efficiency. The study results show that the natural ventilation rate of the tunnel increases with the increase of chimney height, cavity clearance and solar radiation intensity, and the ventilation rate increases by 17% for every 1.4 m increase in chimney height, 16% for every 0.5 m increase in cavity clearance, and 11% for every 200 W/m2 increase in solar radiation intensity. The efficiency of the solar chimney for smoke exhaust is better than that of the traditional shaft, and the effect of chimney height on the efficiency of smoke exhaust is smaller, and the critical value of the cavity clearance for smoke exhaust is 1.5 m. Based on the transverse asymmetric parabolic temperature distribution inside the solar chimney, a prediction model for the volume flow rate at the exit of the chimney is proposed.
关键词
太阳能烟囱 /
城市隧道 /
自然通风 /
火灾排烟 /
新能源
Key words
solar chimneys /
urban tunnels /
natural ventilation /
fire smoke extraction /
renewable energy
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基金
重庆科技学院研究生创新计划项目（YKJCX2120714）; 重庆市博士直通车科研项目（CSTB2022BSXM-JCX0151）; 火灾科学国家重点实验室开放课题（HZ2023-KF07）
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