Turbulent air flow measurements in ventilated spaces
Turbulent air flow measurements in ventilated spaces
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DOI：
10.1016/0160-4120(89)90084-6
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发表时间：
1989
影响因子：
11.8
通讯作者：
K. Kovanen;O. Seppänen;K. Sirén;A. Majanen
中科院分区：
文献类型：
--
作者：
K. Kovanen;O. Seppänen;K. Sirén;A. Majanen
本研究的目的是调查的湍流气流的特性，包括空气的速度，标准差，湍流强度和波动频率在通风空间的占用区域。该研究是通过在具有各种通风和空气分配系统的住宅和办公室中进行现场测量来完成的。选择仅具有最典型的供应和排气装置的房间进行研究。在每个空间中，探测器被放置在占领区的三个位置。在每个位置，测量在四个高度：0.05，0.15，1.1，和1.7米以上的水平。该仪器是在赫尔辛基工业大学暖通空调实验室设计和建造的。为了分析波动频率，使用快速傅立叶变换方法的计算机程序开发。一般情况下，平均速度和湍流强度与气流组织系统没有明显的联系。一个例外包括一个系统与机械排气与供应到大厅，其中的平均速度和湍流强度低于其他系统。随着离地面高度的增加，平均流速减小，湍流强度增大。平均流速和标准差没有普遍接受的关系。湍流强度变化显着。在地面以上1.7和1.1 m处，约90%的可接受值在25%至50%之间变化;在地面以上15 cm处，约90%的可接受值在20%至45%之间变化;在地面以上5 cm处，约90%的可接受值在15%至40%之间变化。研究的光谱在0.1至1.0 Hz范围内没有主要频率。
The purpose of the present study is to survey the characteristics of turbulent airflow, including air velocity, standard deviation, turbulence intensity and fluctuation frequency in the occupied zone of ventilated spaces. The study was accomplished by making field measurements in dwellings and offices with various ventilation and air distribution systems. Rooms with only the most typical supply and exhaust devices were chosen for the study. In each space, probes were placed at three locations in the occupied zone. At each location, measurements were performed at four heights: 0.05, 0.15, 1.1, and 1.7 m above the level. The instrumentation was designed and built in the Laboratory of Heating, Ventilating and Air Conditioning of Helsinki University of Technology. In order to analyze fluctuation frequencies, a computer program using the Fast Fourier Transform method was developed. Generally, the mean velocities and turbulence intensities were in no obvious connection with the air distribution systems. One exception consisted of a system with mechanical exhaust with supply to the hall, where the mean velocities and turbulence intensities were lower than in other systems. Decreasing of the mean velocity and increasing of the turbulent intensity when the level from the floor increased were observed. The mean velocity and the standard deviation had no generally accepted relationship. The turbulence intensity varied remarkably. About 90% of the accepted values varied from 25 to 50% at 1.7 and 1.1 m above the floor level, from 20 to 45% at 15 cm above the floor level, and from 15 to 40% at 5 cm above the floor level. The spectra investigated had no predominant frequency in the range 0.1 to 1.0 Hz.