典型送风形式下室内分区对气流组织和污染物扩散的影响分析

发布时间：2018-05-19 11:28

本文选题：污染物 + 实验测量　；参考：《合肥工业大学》2017年硕士论文

【摘要】：现代社会大量建筑装修材料和空调设备的不当使用,空调房间的空气质量问题已成为人们日常生活的重要关注点之一。同时空调房间普遍都会置有家具或者利用挡板进行区域的划分,特别是人口相对密集的办公区域就常利用挡板进行内部隔断分区。这样长此以往室内会有越来越多有害气体污染物的积累,同时日益密闭的室内环境更加容易造成室内空气品质的严重恶化。送风方式、污染物特性以及内部分区等这些因素都会改变空调房间气流组织分布情况和污染物的排除效果,对室内气体流动和污染物分布影响较大,值得研究。目前针对前两个方面的研究较多,而针对挡板造成的室内分区对室内空气品质影响的研究则相对来说较少,因此十分有必要研究室内分区、送风参数以及污染源位置共同作用下对室内空气品质的影响。本文根据已有实验条件,设计实验方案,通过现场测量的方法,得出顶送下回和下送上回两种通风形式下室内各测点的速度值和温度值,并且整理实验数据。通过CFD数值模拟技术,应用FLUENT软件对实验模型进行数值模拟计算,通过建立k-ε双方程紊流模型对所研究的问题进行数值模拟,得出相应结果。通过将实验值和模拟值直接进行比较、进一步采用与文献的实验研究数据做对比的方法、以及采用符号检验法来检验实验值和模拟值的差异显著性这三种比较方法,从而很好的验证了数值模拟计算的模型在研究此类问题的可行性和可靠性。在充分验证数学模型和数值模拟准确性的前提下,进一步延伸数值模拟来研究室内分区条件下气流组织情况及污染物的分布和扩散特性。其中主要针对室内不同高度的挡板、不同送风形式、不同送风速度以及污染物分布位置不同等工况下进行数值模拟,对比各个工况下室内速度场和污染物浓度场的差异,得出室内空气品质较优的因素搭配,进而总结出在不同工况下室内的流场分布以及污染物扩散特性,以期对室内相应的气流组织设计和基础设备(家具、挡板)的布置提供可行的参考意见。
[Abstract]:With the improper use of a large number of building and decoration materials and air conditioning equipment in modern society, air quality problems in air-conditioned rooms have become one of the most important concerns in people's daily life. At the same time, air conditioning rooms are generally furnished or use baffles to partition the area, especially in the relatively densely populated office area, often using the baffle for internal partition. In the long run, there will be more and more harmful gas pollutants accumulated in the indoor environment, and the increasingly closed indoor environment will lead to the serious deterioration of indoor air quality. These factors, such as air supply mode, pollutant characteristics and internal zoning, will change the distribution of air flow in air conditioning room and the removal effect of pollutants, which has a great influence on indoor gas flow and pollutant distribution, so it is worth studying. At present, there are more studies on the first two aspects, but relatively few studies on the impact of indoor partitions on indoor air quality caused by baffles. Therefore, it is very necessary to study indoor partitions. The effect of air supply parameters and pollution source location on indoor air quality. According to the existing experimental conditions, the experimental scheme is designed in this paper. The velocity and temperature values of indoor measurement points under the two ventilation modes of top return and down return are obtained by the method of field measurement, and the experimental data are arranged. By means of CFD numerical simulation technology, the experimental model is numerically simulated by using FLUENT software, and the corresponding results are obtained by establishing the k- 蔚 two-equation turbulent model. Through the direct comparison between the experimental values and the simulated values, the method of comparing the experimental data with the experimental data in the literature and the symbolic test method are used to test the significance of the differences between the experimental values and the simulated values. Thus, the feasibility and reliability of the numerical simulation model in studying this kind of problems are well verified. On the premise of fully verifying the accuracy of mathematical model and numerical simulation, we extend the numerical simulation to study the distribution of air flow and the distribution and diffusion characteristics of pollutants under the condition of indoor zoning. The difference of indoor velocity field and pollutant concentration field is compared under different working conditions, such as different height baffle, different air supply form, different air velocity and different pollutant distribution. The optimal indoor air quality factors are obtained, and the indoor flow field distribution and pollutant diffusion characteristics under different working conditions are summarized, in order to design the indoor airflow organization and the basic equipment (furniture, etc.) The layout of the baffle provides a practical reference.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X51;TU834.31

【参考文献】