疏透型防护林绕林流场的PIV实验研究  

Experimental research of the flow field through porous windbreaks with particle image velocimetry(PIV)

作　　者：金文[1] 王元[2] 张玮[2] 

机构地区：[1]西安航空技术高等专科学校动力工程系,西安710077 [2]西安交通大学生态环境与现代农业工程中心,西安710049

出　　处：《流体力学实验与测量》2003年第4期56-61,共6页Experiments and Measurements in Fluid Mechanics

基　　金：中国自然科学基金项目资助(10272089);中国科学院资源与生态环境研究重大项目资助(KZ951 B1 231 02)

摘　　要：利用粒子图像测速仪(PIV),采用2帧 互相关的分析方法,对疏透型防护林流场的流动特征在风洞中进行实验研究,获得绕林流场的速度矢量图、速度等势线图和涡量场图。实验中选用的防护林疏透度分别为0%,30%,40%,60%。在各种疏透度下的防护林中,疏透度为0%的防护林近尾流区平均沿流速度衰减幅度大,但恢复也快,且有最高的平均垂直速度。疏透度为30%和40%的防护林绕林流场非常相似,其中疏透度为30%的林带,林后平均沿流速度恢复较慢,且气流扰动较小,具有良好的防风固沙作用。Flow characteristics of flow field through windbreaks have been investigated by Particle Image Velocimetry (PIV) in wind tunnel. The velocity fields were measured using the two-frame cross-correlation technique. The windbreak models used in this study have porosity of 0%,30%,40%,60%respectively.(Among) the porous windbreaks used in the study, the porous windbreak with porosity of 0% shows the maximum reduction of mean streamwise velocity in the near wake region, but it recovers fast, and there is the highest vertical mean velocity. The flow field though the porous windbreak with porosity of 30% and of 40% is similar, but the later has better flow characteristics for abating wind erosion.

关 键 词：防护林 疏透度 防风效应 粒子图像测速仪 PIV实验 速度场 

分 类 号：S727.2[农业科学—林木遗传育种]