空调房间侧送风非等温射流分形特性实验研究

Experimental study on fractal characteristics of non-isothermal jets of side air supply in air-conditioned rooms

通过测量空调房间侧送风口处送风射流的瞬时速度及瞬时温差,得到侧送风射流在时间序列上的分形维数,湍流强度以及阿基米德准数,通过对数据的分析发现,空调房间侧送风射流风口处的湍流强度随着分形维数的增大而增大,并呈明显的线性关系;而阿基米德准数随着湍流强度的增大而增大,并呈偶次幂函数关系。在此基础上引入分形维数这一能够定量反映侧送风射流运动的复杂性和不规则程度的特性数值成为一个新的侧送风气流组织设计参数,以评价湍流运动对于侧送风气流组织设计的影响。

By measuring the instantaneous velocity and instantaneous temperature difference of the air supply jet at the side air outlet of the air-conditioned room,the fractal dimension,turbulence intensity and Archimedes’criterion of the side air jet on the time series are obtained,and the data are analyzed.The turbulence intensity at the air outlet of the air-conditioning room side air supply jet increases with the increase of the fractal dimension,and shows an obvious linear relationship;while the Archimedean number increases with the increase of the turbulence intensity,and shows an even obvious function relationship.On this basis,the fractal dimension,which can quantitatively reflect the complexity and irregularity of the side-supply air jet movement,is introduced as a new side-supply air flow organization design parameter to accurately evaluate the influence of turbulent motion on the design of side-supply air flow organization.