【摘要】 防火林带的防火性能与阻风性能密切相关。本实验采用风洞模拟方法,对通风结构、疏透结构和紧密结构3种防火林带附近的风速进行测定,绘制了3种结构防火林带迎风面的风廊线。结果表明:紧密结构与疏透结构防火林带附近的阻风性能比较好,而通风结构阻风性能最差;但紧密结构防火林带上方的相对风速高达130%,为飞火的产生创造了条件;疏透结构林带上方的最大相对风速只有110%,不具备飞火产生的条件。所以,山脊防火林带的有效结构为疏透结构。更多还原

【Abstract】 The fire proofing efficiency is closely correlated with the wind speed in the aweather area of the firebreak tree belt. In this work the rule of wind speed in the aweather area of the firebreak tree belt with three structures (i.e. sparse structure, tightness structure and ventilation structure) was tested using simulating method in the wind tunnel. The wind speed outline diagram in aweather area of the three different structure of firebreak tree belt was obtained. The research showed that compared with the ventilation structure, the sparse structure and the tightness structure have a higher wind speed proofing efficiency in the windward area of the firebreak tree belt. But relative wind speed over the tightness and sparse structure were up to about 130% and 110% respectively, and the spot fire easily takes place over the tightness structure. So the effective structure of the firebreak tree belt in the ridge of a mountain was the sparse structure.更多还原