有限空间环形射流流场特性研究  

Study on the Flow Field Characteristics of Annular Jet in a Restricted Space

作　　者：李哲然 樊越胜[1] 王欢[1] 张鑫 苏凯 LI Zhe-ran;FAN Yue-sheng;WANG Huan;ZHANG Xin;SU Kai(School of Environmental and Municipal Engineering,Xian 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11期31-34,共4页Building Energy & Environment

摘　　要：通过数值模拟和实验验证方法,对有限空间环形射流流场特性进行研究。研究发现:环形射流能诱导卷吸大量周围气流向有限空间流动,有限空间中的流线几乎呈规则分布的直线。此外,对不同环缝出口速度下的有限空间环形射流的流场特性,中心轴线速度分布和引射系数变化规律进行研究,结果表明:环形射流流场可以分为非交汇区和交汇区,在x=0.35 m处中心轴线速度最小为0.08 m/s,且在该点开始交汇逐渐转变成单股射流,汇聚点位置不受环缝出口速度影响。随着环缝出口速度的增加,引射系数先迅速增加后缓慢减小,当环缝出口速度为16.4 m/s时,引射系数达到最大值5.19。Through numerical simulation and experimental verification methods, the characteristics of the flow field of a finite-space annular jet are studied. It was found that the annular jet can induce the entrainment of a large amount of ambient air flow into a confined space, and the flow lines in the limited space are almost straight lines with regular distribution. In addition, the flow field characteristics, central axis velocity distribution, and the change law of the ejector coefficient of annular jets with different annular seam exit velocity were studied. The results show that the annular jet flow field can be divided into non-intersection zones and intersection zones. The minimum central axis velocity at x=0.35 m is 0.08 m/s, and at this point, the intersection begins to gradually transform into a single jet. The position of the convergence point is not affected by the exit velocity of the annular seam;with the increase of the velocity of the exit of the annular seam, the ejection coefficient first increases rapidly and then slowly decreases. When the exit velocity of the annular seam is 16.4 m/s, the ejection coefficient reaches a maximum of 5.19.

关 键 词：有限空间 环形射流 数值模拟 流场特性 引射系数 

分 类 号：TD714.4[矿业工程—矿井通风与安全] TD72