• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Building and Environment >Pedestrian-level wind speed enhancement in urban street canyons with void decks
【24h】

Pedestrian-level wind speed enhancement in urban street canyons with void decks

机译：空荡的甲板在城市街道峡谷中提高行人风速

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Low wind speeds can inhibit passive ventilation and reduce thermal comfort in tropical cities. We use both experimental and numerical approaches to investigate pedestrian-level wind speed enhancement with void decks (empty spaces at the ground floors) in urban street canyons. Water channel experiments show that void decks allow wind to pass through them, thereby enhancing pedestrian-level wind speeds up to twofold. Computational fluid dynamics models validated with the experiments were used to conduct two parametric studies. The first study varied the void deck height and showed that the wind enhancement effects increase with taller void decks, as expected. The second study varied the canyon aspect ratio and showed that variations in the canyon aspect ratio had less influence on wind enhancement compared to the variations in the void deck height. This is because a void deck induces a secondary vortex, which counter-rotates with the vortex driven by the freestream. Increasing the canyon aspect ratio stretches the vortices vertically but does not alter the (normalized) flow fields. Our findings reveal the potential of void decks to channel wind into street canyons, including narrow (high height-to-width aspect ratio) canyons, which suffer from poor ventilation. The enhanced wind speeds are beneficial for pollutant dispersion and outdoor thermal comfort in tropical cities.
机译：在热带城市中，低风速会抑制被动通风并降低热舒适度。我们使用实验和数值方法来研究城市街道峡谷中带有空甲板（底层的空空间）的行人水平风速增强。水道实验表明，空甲板允许风通过，从而将行人水平风速提高了两倍。经实验验证的计算流体动力学模型用于进行两项参数研究。第一项研究改变了空甲板的高度，并表明，如预期的那样，较高的空甲板会增强风的作用。第二项研究改变了峡谷的纵横比，并表明与空甲板高度的变化相比，峡谷的纵横比的变化对增强风的影响较小。这是因为空隙平台会引起二次涡旋，该二次涡旋与自由流驱动的涡旋反向旋转。增加峡谷的纵横比会垂直拉伸漩涡，但不会改变（标准化的）流场。我们的发现表明，空甲板可能会将风引导到街道峡谷中，包括狭窄（高宽高比）的峡谷，这些峡谷通风不良。风速的提高有利于热带城市污染物的扩散和室外的热舒适性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号