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首页> 外文期刊>Building and Environment >Quantitative city ventilation evaluation for urban canopy under heat island circulation without geostrophic winds: Multi-scale CFD model and parametric investigations
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Quantitative city ventilation evaluation for urban canopy under heat island circulation without geostrophic winds: Multi-scale CFD model and parametric investigations

机译：无热盆风下热岛循环下城市天窗的定量城市通风评价：多规模CFD模型和参数调查

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摘要

Urban breathability is fundamentally important for improving urban air environment. Nowadays, air pollution and extreme heat waves heavily threaten modern cities and residents. In this paper, a methodology combined with an idealized High-Reynolds-Number Porous-Media city model and a multi-scale Computational Fluid Dynamics (CFD) method will be firstly proposed to quantify the urban ventilation breathability under no geostrophic winds. Breathability of city was then evaluated in terms of air change rate per hour (ACH) and age of air. The contribution of five factors to urban heat island and air quality is analyzed qualitatively and quantitatively. Numerical results further demonstrate that, 1) For heat island intensity, the dominant importance of influencing factors is: heat flux temperature lap rate urban scale building height urban density. Urban heat flux and temperature lapse rate have great influences on the urban heat island intensity and air quality. Comparing with neutral atmosphere, ACH in urban canopy decreased by more than a half under inversion condition, whereas ACH in pedestrian layer decreased by nearly 100%. 2) For air quality, the importance of the influencing factors could be listed as, building height heat flux temperature lapse rate urban scale urban density. Building height has the greatest impact on air quality. With the increase of urban scale, average age of air for a city decreases first and then increases. There exists an optimal city size to minimize the age of urban air. Urban building density (regardless of heat emission) on the buoyancy driven flow was very weak. Present model and research results could have theoretical significance for the council and urban planners to alleviate urban heat island and urban air pollution through reasonable planning of urban building layouts.
机译：城市透气性对改善城市空气环境至关重要。如今，空气污染和极端热量浪潮严重威胁着现代城市和居民。在本文中，将首先提出一种与理想化的高雷诺数多孔媒体城市模型和多尺度计算流体动力学（CFD）方法的方法，以量化在没有地顶尖风中的城市通风透气性。然后在城市的透气性在每小时的空气变化率（ACH）和空气年龄方面进行评估。定性和定量分析了城市热岛和空气质量的五个因素的贡献。数值结果进一步证明了，1）对于热岛强度，影响因素的显着重要性是：热通量＆温度LAP率＆城市规模＆建筑高度＆城市密度。城市热通量和温度流逝速率对城市热岛强度和空气质量有很大影响。与中性气氛相比，城市树冠中的ACH在反演条件下减少了一半以上，而行人层的ACH在近100％下降。 2）对于空气质量，影响因素的重要性可以被列为建筑物高度＆热通量＆温度流逝率＆城市规模＆城市密度。建筑高度对空气质量产生最大的影响。随着城市规模的增加，城市的平均空气年龄首先减少，然后增加。存在最佳的城市规模，以尽量减少城市空气的年龄。城市建筑密度（无论热排放如何，浮力驱动流动都非常弱。目前的模型和研究结果可能对安理会和城市规划者通过合理规划来缓解城市热岛和城市空气污染的理论意义。

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  • 来源
    《Building and Environment》 |2021年第6期|107793.1-107793.15|共15页
  • 作者

    Jing Yi; Zhong Huai-Yu; Wang Wei-Wei; He Yi; Zhao Fu-Yun; Li Yuguo;

  • 作者单位

    Wuhan Univ Key Lab Hydraul Machinery Transients Minist Educ Wuhan Hubei Peoples R China|Wuhan Univ Sch Power & Mech Engn Dong Hu Southern Rd Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Key Lab Hydraul Machinery Transients Minist Educ Wuhan Hubei Peoples R China|Wuhan Univ Sch Power & Mech Engn Dong Hu Southern Rd Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Key Lab Hydraul Machinery Transients Minist Educ Wuhan Hubei Peoples R China|Wuhan Univ Sch Power & Mech Engn Dong Hu Southern Rd Wuhan 430072 Hubei Peoples R China;

    Victoria Univ Wellington Wellington Sch Architecture Wellington New Zealand;

    Wuhan Univ Key Lab Hydraul Machinery Transients Minist Educ Wuhan Hubei Peoples R China|Wuhan Univ Sch Power & Mech Engn Dong Hu Southern Rd Wuhan 430072 Hubei Peoples R China;

    Univ Hong Kong Dept Mech Engn Pokfulam Rd Hong Kong Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Thermal driven city ventilation; Joint effects of UHI and UAQ; Urban breathability; Age of air; Multi-scale CFD modeling; Main text;

    机译：热驱动的城市通风;UHI和UAQ的联合影响;城市透气性;空气年龄;多种CFD建模;主要文本;

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