不同结构单排林带防风效应的风洞模拟

摘要/Abstract

摘要： 风速大小、林带疏透度及高度都会对林带周围气流产生影响，使气流在林带两侧发生分离或积聚，从而形成不同的防护功能区。为探求林带结构对防风效应的影响机理，选取10组高度和疏透度不同的林带模型，对其防风效应进行了风洞模拟实验，通过绘制加速率等值线图及其变化趋势线、防风效应图，并计算不同结构单排林带的有效防护距离，进而揭示风速、林带疏透度和高度对林带上风向和下风向风速、防风效应和有效防护距离的影响规律。

关键词: 疏透度, 林带模型, 防风效应, 有效防护距离

Abstract: Wind velocity, porosity and height of shelter belt exert a profound influence on airflow around the shelter belt, and the speed of airflow flowing through shelter belt will increase or decrease. The peripheral wind field around shelter belt could be divided into three parts according to wind rate change: slightly decelerating zone, significantly decelerating zone and transition zone. In wind tunnel experiment, we selected 10 groups of physical models with different porosity and height instead of realistic shelter belts; experimental data were automatically recorded. Based on the experimental data, isolines and variation trend curves of wind accelerating rate were obtained, with which the effective protective distance of shelter belt was calculated. The research has revealed the response law of accelerating rate, windbreak effect and effective protective distance to the wind speed, the porosity and the height of the shelter belts.

Key words: porosity, forest model, windbreak effect, effective protective distance

中图分类号:

X169

唐玉龙, 安志山, 张克存, 谭立海. 不同结构单排林带防风效应的风洞模拟[J]. 中国沙漠, 2012, 32(3): 647-654.

TANG Yu-long, AN Zhi-shan, ZHANG Ke-cun, TAN Li-hai. Wind Tunnel Simulation of Windbreak Effect of Single-row Shelter Belts of Different Structure[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(3): 647-654.

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