【作者】 李磊；

【导师】 李彦鹏；

【作者基本信息】 长安大学 ， 建筑与土木工程（专业学位）， 2014， 硕士

【摘要】 随着社会经济的发展和人民生活水平的提高，通风空调建筑越来越多，在室内这样一个相对封闭空间，人们长时间接触病毒和细菌等微生物颗粒物，这将构成严重的潜在健康风险。因此研究室内微生物颗粒物的运动传播规律显得尤为重要，而通风量大小作为一个重要影响因素，是本文研究的主要内容。本文以通风房间的微生物气溶胶传播数值模拟为研究重点，以流体力学、传热学和多相流运动为理论基础，运用计算流体力学(CFD)方法进行研究工作。首先选择某通风房间为研究对象，并以此建立物理模型，并进行合适的网格划分，选择恰当的边界条件，选用k—ε两方程模型，针对不同微生物源的形式和不同的通风量情况，对其进行数值模拟，从温度场、速度场、浓度场等角度，对不同通风量的结果进行对比并得出结论。然后选择微生物颗粒轨道模型，对通风房间典型粒径的微生物颗粒的运动轨迹进行模拟，从而了解微生物气溶胶的分布规律及在室内的运动情况。本文的研究结果表明：通风量越大，室内同一位置上压力、风速越大，微生物气溶胶浓度值越小，空气龄越小，排除污染物的能力越强。污染物从源出来之后，速度会迅速减至气流速度。增加风量，可以缩短气溶胶排出房间所用时间，气溶胶运动越来越快。通风房间的微生物气溶胶对气流有很强的跟随流性，气流在进风口边缘附近处会形成涡流，在房间中心区域的气溶胶随气流运动，并从回风口送出。更多还原

【Abstract】 With the development of social economy and the improvement of people’s livingstandards, there are more and more buildings with ventilation and air conditioningsystems. In such relatively closed space, people have long time exposure to the virusand bacteria and other microorganisms particles. Therefore study on the motionpropagation in indoor microbial particles appear particularly important. As one of theimportant factors, the effects of the ventilation rate on indoor bioaerosol propagationis the main content of this thesis.This paper focused on the numerical simulation of microbial aerosoltransmission in ventilation room, based on the theoretical basis of fluid mechanics,heat transfer and multiphase flow. At first, we select a ventilated room for the study,establish a physical model and make the appropriate grid, choose the appropriateboundary conditions and k-epsilon two equation model. According to different formof microbial source situation and different ventilation rate, we carry on the numericalsimulation. From the temperature field, velocity field and concentration field angle,we compare with the results of different ventilation rate and draw conclusions. Andthen，we select the microbial particle trajectory model and simulate the typical size ofmicroorganism particle, in order to understand the distribution of microbial aerosolsand its in indoor sports.The research results show that the greater the ventilation rate, the greater interiorpressure and wind speed at the same location. The greater the ventilation rate, thesmaller the microbial aerosol concentration and the air age. Pollutants from the sourceafter it, the speed will be rapidly reduced airflow. Increasing the amount of wind canshorten the time that aerosol discharge from the room. The microbial aerosol inventilation room follow the air flow, which will produce eddy current near the inletedge. Aerosols follow the air campaign in the central area of the room and then sentout from the outlet.更多还原