自然通风下装修污染物排放的大涡模拟

发布时间：2018-05-18 04:42

本文选题：住宅 + 室内空气污染　；参考：《青岛理工大学》2009年硕士论文

【摘要】：人的一生至少有80%以上的时间实在室内度过的,室内环境对人们的身体健康及工作效率有极大影响。目前城市地区普遍存在较为严重的室内空气污染问题。自然通风方法驱除室内空气污染物效果好、能耗低,正日益受到重视。数值模拟方法尤其是大涡模拟省时省力,可对自然通风过程进行较为准确的模拟,已被用于对自然通风的研究。目前尚缺乏对整套住宅整体自然通风的大涡模拟研究,此类过程中污染物排放的具体规律尚未被完全认识。本文采用大涡模拟方法针对整套住宅,对其在不同条件下的自然通风及室内空气污染物排放过程进行了三维大涡数值模拟,得到了详细的流场的污染物浓度场数据。对计算结果的分析表明:自然通风时流场中的大尺度涡是污染物积存的主要区域;不同的房间布置产生不同的流场,从而影响换气效果,多开口房间污染物稀释速度为单开口房间的2—10倍,将单开口房间变为多开口房问,减小、破坏多开口房间回流区可有效提高换气效果;一般情况下污染物排放速度与外界风速成正比;污染物排放主要受对流作用影响,扩散作用影响可以忽略,因而不同的污染物具有极为相似的排放规律。这些结论对于自然通风研究有一定参考价值,可用于指导实际建筑通风方式的设计工作。
[Abstract]:At least 80% of the time is spent indoors, and the indoor environment has a great impact on people's health and work efficiency. At present, there are serious indoor air pollution problems in urban areas. Natural ventilation method has been paid more and more attention because of its good effect and low energy consumption. The numerical simulation method, especially the large eddy simulation method, saves time and labor, and can simulate the natural ventilation process accurately. It has been used in the study of natural ventilation. At present, there is no large eddy simulation study on the whole house natural ventilation, and the specific rules of pollutant emission in this process have not been fully understood. In this paper, the large eddy simulation method is used to simulate the natural ventilation and indoor air pollutant emission process under different conditions, and the detailed data of pollutant concentration field in the flow field are obtained. The analysis of the calculated results shows that the large scale vortex in the flow field is the main area of pollutant accumulation in natural ventilation, and that different room arrangement produces different flow field, which affects the effect of air exchange. The dilution rate of pollutants in the multi-opening room is 2-10 times of that in the single-opening room, and the ventilation effect can be improved effectively by changing the single-opening room into a multi-open room, reducing the volume of pollutants and destroying the backflow zone of the multi-opening room. In general, the pollutant emission velocity is proportional to the external wind speed, and the pollutant discharge is mainly affected by convection, but the diffusion effect can be neglected, so different pollutants have very similar emission law. These conclusions have some reference value for the study of natural ventilation and can be used to guide the design of ventilation mode in practical buildings.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：X51

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