| 陈芳达,代钦*.风压作用下房屋自然通风的PIV实验研究[J].实验力学,2011,26(4):356~368 |
| 风压作用下房屋自然通风的PIV实验研究 |
| Experimental Study of Natural Ventilation Driven by Wind Pressure Based on PIV System |
| 投稿时间：2011-03-09 修订日期：2011-03-31 |
| DOI： |
| 中文关键词: 自然通风 风压 流量系数 粒子图像测速(PIV)实验 空气品质 |
| 英文关键词:natural ventilation wind pressure flow coefficient particle image velocimetry experiment(PIV) air quality |
| 基金项目:上海市重点学科(Y0103)项目资助 |
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| 中文摘要: |
| 为认识屋内流动结构和改善房屋自然通风效果，本文介绍了风压作用下大开口的房屋自然通风模型的风洞实验结果。首先通过表面压力分布测量得到了建筑物表面风压系数的分布规律，以此为依据选取合理的窗口位置。而后采用PIV粒子图像测速技术，对房屋模型内自然通风的流场进行定量测量，研究不同窗口大小和窗口位置对室内流场速度分布的影响;通过实验比较不同工况下自然通风效果的优劣，对如何改善建筑物内部空气品质提出合理建议。实验得到了不同工况下自然通风的流量及流场结构。通过对实验结果的分析，发现在大开口的情况下，采用传统的流量系数计算方法得到的通风量会偏小，无法反映真实的通风情况。各个模型中，综合考虑新风流量、室内空气平均年龄、污染物较为集中的位置等因素，发现选择进风窗口大、出风窗口小的通风模型，产生风压作用下穿堂风式的自然通风，可以得到更好的通风效果。而室内家具的摆放也会影响房间内部的空气流动，合理放置家具可以提高室内的空气品质。 |
| 英文摘要: |
| In order to realize the flow structure and improve the effect of natural ventilation in a house, wind tunnel house model experiment of cross natural ventilation driven by wind pressure through large openings was carried out and its results are presented in this paper. Firstly, the surface pressure distribution on the model was measured. Thus the distribution of wind pressure coefficient on the house model surface was obtained, which formed the basis for selecting appropriate opening position. Then, in order to understand the influence of opening size and opening position on the indoor flow velocity distribution, flow field of the cross ventilation inside the house model was captured by particle image velocimetry (PIV) system. Advantages of cross ventilation under different conditions were compared to improve the air quality inside the house model. In the case of large openings, the flow coefficient is under estimated if using traditional calculation method of ventilation, and the result is inconsistent with practical situation. Taking into account all factors including fresh air flow, average age of indoor air and air pollutants conditions, the best ventilation effect is achieved by selecting the model with big air inlet window and small air outlet window in all models. Furniture locations in a room will also affect air flow. Suitable furniture locations can improve the indoor air quality. |
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