数字街谷及其热环境模拟

Digital canyon and thermal environment simulation

当前在城市热环境研究中广泛使用的“街谷”是在二维简化条件下街道的一种近似模型,但在三维情况下,街道的几何尺度应达到什么样的比例范围才其为“谷”还未见有人述及.本文利用作者建立的街谷动态模型,对典型街谷进行了温度场数值模拟,从热现象出发给予了“街谷”准确的数值定义.通过详细地对七种不同高宽比的街道热环境的模拟和结果分析,提出将高宽比大于等于1∶0.9作为“街谷”的数值定义,使研究结论更具针对性,并从实用的角度给出了最佳高宽比的推荐范围,为优化建筑设计以改善城市户外环境提供了理论基础.

Street canyon is seen to freguent many papers concering the urban thermal environment. However, there is nothing mentioned for the field of urban street canyon in three-dimensional cases. The numerical definition for urban street canyon has been given in this paper through conducted numerical simulation of typical street canyon using the dynamic model of the canyon established by the author. Through detailed data analysis of different street models in their heightwidth ratio, the author defines the street with height-width ratio more than or equation to 1：0.9 as urban street canyon. This paper also offers the recommended range of the best height-width ratio of the canyon at a pragmatic angle. The work of this paper lays a theoretical foundation of optimiapply theory of engineering thermodynamics for urban planning.