工业建筑中高温颗粒物在近壁区扩散特性研究  

Study on Diffusion Characteristics of High-Temperature Particles in the Near-Wall Region of Industrial Buildings

作　　者：高东 段梦婕[1] 王怡[1] 段栋丹 GAO Dong;DUAN Meng-jie;WANG Yi;DUAN Dong-dan(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology)

机构地区：[1]西安建筑科技大学环境与市政工程学院

出　　处：《建筑热能通风空调》2019年第6期11-14,26,共5页Building Energy & Environment

基　　金：国家杰出青年科学基金(No.51425803);工业建筑环境与节能创新团队(2017KCT-14)

摘　　要：本文采用数值模拟方法对工业建筑中短时间散发的高温颗粒物在近壁区的扩散规律进行研究,明确了不同粒径的高温颗粒污染物的温度、速度变化,阐明了颗粒物与气流跟随性的差异。结果表明在扩散过程部分颗粒物会与气流分离呈现出与周围气流相反的运动状态,粒径d=20μm和30μm的颗粒物表现的更为显著,其在运动过程中具有最大上升高度,粒径d=30μm的颗粒物脱离气流的比例高达33.61%,粒径d=1μm,5μm和10μm的颗粒物可以随气流上升到厂房顶部。颗粒物在水平方向上的扩散半径随粒径的减小呈现增大趋势。扩散边缘区域的颗粒物较易脱离气流。In this paper, the numerical simulation method was used to study the migration and diffusion of high-temperature particles scattered in the near-wall region for a short time in industrial buildings. The temperature and velocity of high-temperature particle pollutants with different sizes are claritied, and then explain clearly the difference between the particles and the airflow. The results showed that during the diffusion process, part of the particles separated from the gas stream exhibited the opposite state of movement to the surrounding gas flow. Particles with the diameters of 20 μm and 30 μm exhibited more pronounced, with the maximum rise height during the movement process. The particles of d=30 μm out of the gas flow rate up to 33.61%, the particles of d=1 μm, 5 μm and 10 μm can rise with the airflow to the top of the plant;With the decrease of the size of particles, the diffusion radius of the particles in the horizontal direction increases;and particles in the diffusion edge region are easier to escape from the airflow.

关 键 词：工业建筑 瞬态 高温颗粒物 近壁区 

分 类 号：X513[环境科学与工程—环境工程]