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研究冷风挡帘结构对寒冷干旱地区日光温室内温度分布的影响。以内蒙古呼和浩特近郊农户生产中使用的日光温室为研究对象,分别对具有冷风挡帘的日光温室(试验温室)和无挡帘的普通温室(对照温室)内的气温进行连续测试,建立2种日光温室在自然通风时的计算流体力学模型。结果表明:在距地面0.1m高度(作物冠层),试验温室在0.6~7.0m范围内的气温显著高于对照温室(α=0.05),温差最大值为4.2℃,最小值为1℃。将近地表气温低于20℃的区域面积值作为评价指标,当通风口底端竖直高度为0.25 m、宽0.3 m,太阳辐射≥300 W/m2,室外风速≤1.2m/s时,冷风挡帘最优结构参数为迎风长度0.84m,倾斜角度76°,此时不同进口风速能满足大部分耕作区域地表气温在12:00时高于20℃的生产要求。
The effect of cold air curtain structure on temperature distribution in solar greenhouse in cold and dry areas was studied. Taking the solar greenhouse used in farmer households in the outskirts of Hohhot, Inner Mongolia as the research object, the temperatures in the solar greenhouse (test greenhouse) and the normal greenhouse without greenhouse (control greenhouse) were continuously tested respectively to establish two kinds of sunlight Computational Fluid Dynamics Model of Greenhouse in Natural Ventilation. The results showed that the temperature in the test greenhouse was significantly higher than that in the control greenhouse (α = 0.05) at a height of 0.1 m (crop canopy) from 0.6 to 7.0 m. The maximum temperature difference was 4.2 ° C and the minimum was 1 ° C. When the surface area near the surface temperature is lower than 20 ℃, the value of the area is the evaluation index. When the vertical height at the bottom of the vent is 0.25 m, the width is 0.3 m, the solar radiation is ≥300 W / m2 and the outdoor wind speed is ≤1.2 m / s, The optimum structural parameters of the curtain are the windward length of 0.84m and the inclination angle of 76 °. At this time, different inlet wind speeds can meet the production requirements that the surface temperature of the cultivated area is higher than 20 ℃ at 12:00 in the farming area.