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首页> 外文期刊>Transactions of the ASAE >VENTILATION COEFFICIENT FORWIND-INDUCED NATURAL VENTILATION IN CATTLE BUILDINGS: A SCALE MODEL STUDY IN AWIND TUNNEL
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VENTILATION COEFFICIENT FORWIND-INDUCED NATURAL VENTILATION IN CATTLE BUILDINGS: A SCALE MODEL STUDY IN AWIND TUNNEL

机译：牛舍通风诱导的自然通风的牛棚结构：规模模型研究

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摘要

Parameters affecting the ventilation coefficient, Cvref, of a cattle building were evaluated in a wind tunnel: wind speed, roughness of the surrounding field, angle of impact of the wind, wind screens in the inlet opening, spoilers on the roof. An existing cattle building was copied and modeled at a scale of 1/60 so that the model could be placed within the 0.15 m thick boundary layer of the wind tunnel. Low (uref = 2.6 m s–1), medium (uref = 6.0 m s–1) and high (uref = 11.0 m s–1) wind speeds were applied with corresponding roughness coefficients of the surrounding zones of respectively n = 0.28; n = 0.14 and n = 0.18. The impact of the wind was 0° and 90° according to the longest axis or the side walls of the model. Wind screens with three different porosities were placed in the air inlet of the side wall of the model. Experiments were carried out with and without spoilers on the roof. As the ventilation coefficient Cvref determines the airflow discharge at the inlet for different wind speeds, a relationship was established between Cvref and the parameters affecting the ventilation of the cattle building. The Cvref is affected by the angle of incidence of the wind, by the porosity of the wind screen at the air inlet, by the roughness of the surrounding zones and whether or not a spoiler exists at the ridge of the cattle building.
机译：在风洞中评估了影响牛舍通风系数Cvref的参数：风速，周围环境的粗糙度，风的冲击角度，进气口的挡风玻璃，屋顶的扰流板。复制了现有的牛舍并以1/60的比例建模，以便可以将模型放置在风洞的0.15 m厚边界层内。应用低速（uref = 2.6 m s-1），中速（uref = 6.0 m s-1）和高（uref = 11.0 m s-1）风速，周围区域的粗糙度系数分别为n = 0.28； n = 0.14和n = 0.18。根据模型的最长轴或侧壁，风的影响分别为0°和90°。将具有三种不同孔隙率的挡风玻璃放置在模型侧壁的进气口中。在有或没有扰流板的情况下进行了实验。由于通风系数Cvref确定了不同风速下入口处的气流排放，因此Cvref与影响牛舍通风的参数之间建立了关系。 Cvref受风的入射角，进气口处挡风玻璃的孔隙率，周围区域的粗糙度以及牛舍的屋脊处是否有扰流板的影响。

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