摘要
变化拖对防风林和体积起作用的力量拖系数因为不同防风林宽度在水力的工程实验室在Eiffel类型非传播的风隧道试验性地被学习， Saitama 大学，日本，阐明在在一个防风林后面的风速度减小上的风方向的防风林宽度的效果。为不同防风林宽度的流动地的变化被使用二维的平均 Reynolds 的海军司烧(RANS ) 数字地学习与一个 k-ε 骚乱闭合模型一起的方程。结果证明总数拖力量到与增加防风林宽度，而是体积增加的风拖系数稍微减少了。在体积之间的关系拖系数 C <SUB > d </SUB > 并且防风林宽度 W 和高度 H 能被 C <SUB 的方程介绍 > d </SUB>=k <SUB > d </SUB>(W/H)<SUP>−b </SUP>(k <SUB > d </SUB>, b：常数) 。数字模拟的结果证明防风林宽度极大地影响地点和最小的风速度的价值。风速度减少了由 15%22% 作为防风林，宽度增加了。
The variations of drag force acting on the windbreak and the bulk drag coefficients for different windbreak widths were studied experimentally in the Eiffel-type non-circulating wind tunnel at the Hydraulic Engineering Laboratory, Saitama University, Japan, to elucidate the effects of windbreak width in the wind direction on wind velocity reduction behind a windbreak. The variations of flow field for different windbreak widths were studied numerically by using the two-dimensional Reynolds-averaged Navier-Stokes （RANS） equation with a k-c turbulence closure model. Results show that the total drag force to wind increased with increasing windbreak width, but the bulk drag coefficient decreased slightly. The relationship between the bulk drag coefficient Cd and the windbreak width W and height H can be presented by the equation of Ca= kd （W/H）^-b （kd, b： constants）. The result of the numerical simulation shows that the windbreak width greatly affects the location and the value of the minimum wind velocity. The wind velocity decreased by 15%-22% as the windbreak width increased.
