西安市城区通风环境数值建模及分析

Numerical simulation and analysis of ventilation environment in Xi'an

近年来,城市建筑的高度和密度不断增加,对城市通风环境产生了很大影响。针对西安市绕城高速以内区域,建立了城区建筑、道路等几何模型,在此基础上建立了城市风环境数值仿真模型。通过数值仿真,分析了在冬季主导风ENE风向下,区域风环境的现状,包括风速分布、通风能力等。研究表明,建筑布局、街道布局、建筑密度和风向会对区域风速分布及通风能力有明显影响。控制城市内十字路口处建筑高度及建立城市主导风向上通风廊道有利于城市内的通风。

In recent years,urban building height and density increasing,had a great influence to the urban ventilation environ-ment.According to the distribution of buildings,roads which is inside the beltway of Xi’an,a numerical model for urban wind en-vironment was established.The current situation of wind environment with dominant wind direction ENE in winter,including wind speed and ventilation potential,etc.was analyzed.It was found that layout and density of buildings and streets,and wind direction could significantly affect the distribution of regional wind speed and ventilation potential.Conrolling the building height at the crossing and to establish a ventilated corridor of the dominant direct wind are both benefitical to the ventilation of urban ar-ea.