太阳能烟囱在地下空间中的通风特性及优化
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TU962

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国家自然科学基金资助项目(11402215);重庆市基础与前沿研究计划项目(cstc2015jcyjA00010); 重庆市教委科学技术研究项目(KJ1600523)。


Ventilation characteristics and optimization of solar chimney in underground space
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    摘要:

    建立无量纲模型对不同Ra下太阳能烟囱内部气体流动特性及出口质量流率规律进行数值分析,提出结构优化方案以增大烟囱出口质量流率。研究结果表明,随着Ra的增加,烟囱内气体由完全出流逐渐转变为出口反向流特征,出现反向流时Ra近似为106;分析烟囱出口质量流率得到,出口处无量纲质量流率随Ra的增大而增大,但反向流的出现会减小其增长率。出口反向流现象是影响太阳能烟囱强化通风效果的重要因素之一,由此提出倾斜式优化通风结构。

    Abstract:

    To investigate the effect of a solar chimney on the ventilation in a underground space, a dimensionless model was established in this work to numerically analyze internal airflow characteristics and outlet flow regularity of the solar chimney under different Rayleigh number (Ra). A structure optimization measure was proposed to increase the outlet mass flow rate of the chimney. The results indicated that with the increase of Ra, the airflow in the chimney changed from the state of a full outflow to a reverse flow, which occured at the outlet of the chimney when Ra was approximately equal to 106. It was also found that with the increase of Ra, the dimensionless mass flow rate at the outlet increased. But its growth rate decreased when the reverse flow emerged, implying that the reverse flow was one of the important factors affecting the ventilation effect of the underground space. Accordingly, a tilted optimal ventilation structure was put forward.

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陈震寰,姚丽萍,邱周华.太阳能烟囱在地下空间中的通风特性及优化[J].重庆大学学报,2019,42(3):15-24.

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  • 收稿日期:2018-04-10
  • 在线发布日期: 2019-04-09
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