摘要
在大气边界层风洞中,利用粒子图像速度场仪(PIV)对风绕过二维温室的流动进行了流场测量.观察分析了绕流瞬态流场和时均流场的信息:气流流经温室的曲线前缘,流线顺滑,没有明显的漩涡区,而在后部,气流分离产生剪切流动过程,形成封闭的湍流回流区域.由于温室后缘挑檐的作用,靠近温室后壁存在一个逆时针旋转的旋涡,同时再附距离加大到约7.7H;后部回流区中可同时有2～4个不规则漩涡结构,漩涡间的作用非常强烈。
Particle Image Velocimetry (PIV) Measurements were carried out on a 2-D flow field around the greenhouse in the atmospheric boundary layer wind tunnel. The rules and status of mean-time or Instantaneous flow field were observed in steady flow. The streamlines were smooth at the foreside with a curved line and the free shear layer separation was generated at the backward edge of the greenhouse to form a turbulent recirculating region where there is not only an anticlockwise eddy near the back border but also 1～3 clockwise eddy synchronously. The intense interaction between vortexes may reduce the recirculating region to about 7.7H.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2005年第2期160-163,168,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家"十五科技攻关"重大项目 (2 0 0 4BA90 1A2 1)
关键词
PIV
温室
流场
风洞实验
PIV
greenhouse
flow field
wind tunnel test
