空调房间内气流组织及颗粒物分布的数值模拟

发布时间：2018-03-21 23:31

本文选题：室内空气品质　切入点：气流组织　出处：《东北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：21世纪以来，随着大气污染的加重，人们对空气品质的要求也越来越高。人们每天在室内的时间大约占整天时间的80%左右，所以室内环境对人体健康有着更为重要的影响。而空调系统的主要目的就是为室内人员创造一个健康、舒适的环境。但是随着对颗粒物污染研究的深入，有关颗粒物对人体的危害已成为主要问题。这就对空调系统对室内空气品质的调节能力提出了新一轮的挑战。本文以商业软件FLUENT为平台，以夏季工况下某一学院研究生办公室的空调房间作为物理研究对象，，对空调房间内三种常见的气流组织方式进行模拟计算。采用可实现k模型并结合壁面函数法建立空调房间的速度场、温度场的三维湍流数学模型，通过研究各场相应参数的分布规律，从而得到三种气流组织各自的优缺点。同时，本文又建立了设置等效渗透颗粒污染源的空调房间物理模型，对颗粒相采用颗粒轨道模型，模拟了不同气流组织下，颗粒污染物在空调房间内的运动轨迹和浓度分布，并分析了粒径对颗粒物浓度分布的影响。Airpak软件可以形象、快捷地展现出模拟的结果，方便我们对数据进行提取和比较分析。模拟结果表明，对于本文中所模拟房间，异侧上送下回的通风形式会造成气流短路设计不合理。而同侧上送下回以及下送顶回的通风形式均可以满足设计规范以及人体舒适性的要求。但在考虑到要将室外渗透进室内的颗粒物污染物更有效的排出房间，提高室内空气的洁净度，则同侧上送下回通风形式的优势将凸显出来。下送顶回的空气流型不利于颗粒物的排出，特别是粒径较大的颗粒物。
[Abstract]:Since the 21st century, with the aggravation of air pollution, the demand for air quality has become higher and higher. People spend about 80% of the whole day indoors. So the indoor environment has a more important impact on human health. The main purpose of the air conditioning system is to create a healthy and comfortable environment for indoor personnel. The harm of particulate matter to human body has become a major problem, which poses a new challenge to the ability of air conditioning system to regulate indoor air quality. This paper takes the commercial software FLUENT as the platform, takes the air conditioning room of a graduate office of a college under the summer working condition as the physics research object, In this paper, three kinds of common airflow organization modes in air conditioning room are simulated and calculated. By using the realizable k model and the wall function method, the three dimensional turbulent mathematical model of the air conditioning room and temperature field is established. By studying the distribution law of the corresponding parameters of each field, the advantages and disadvantages of the three kinds of airflow organization are obtained. At the same time, the physical model of air conditioning room with equivalent permeable particle pollution source is established, and the particle track model is used for the particle phase. The movement trajectory and concentration distribution of particulate pollutants in air conditioning room were simulated under different airflow conditions. The influence of particle size on particle concentration distribution was analyzed. Airpak software can visualize and quickly show the simulation results. It is convenient for us to extract and compare the data. The simulation results show that, for the room simulated in this paper, The airflow short-circuit design will be unreasonable due to the ventilation form of the offside up and down return, and the ventilation form of the same side up and down return and down top return can meet the requirements of the design code and the human body comfort. The particulate pollutants that infiltrate the room more effectively, To improve the cleanliness of indoor air, the advantage of the same side air flow pattern will be highlighted, and the air flow pattern of top return is not conducive to the emission of particulate matter, especially the larger particle size.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU831;X51

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