地槽通风高大平房仓仓内温度场研究

[目的]研究高大平房仓地槽通风对仓内温度的影响。[方法]利用数值模拟软件COMSOL，对仓房尺寸为60 m×24 m，装粮高度为6 m的高大平房仓进行96 h机械通风条件下的温度场数值模拟，通过建立质量守恒、动量守恒和能量守恒方程，分析不同通风方式条件下仓内温度场变化情况，并对不同单位通风量工况进行数值模拟拓展。[结果]机械通风36 h后，仓内装粮线以下粮堆大部分已降至15 ℃；机械通风96 h后，粮堆温度已降至15 ℃以下，距离仓底1~6 m处粮层温度均降至15.2 ℃以下；单位通风量从3 m³/（h·t）增至8 m³/（h·t）时，粮堆降温速度变快。[结论]在地槽通风条件下，粮堆温度从仓底逐渐降低，并呈圆弧状进行扩散；仓内粮堆温度变化出现一定的迟滞，随着距离仓底距离的逐渐增加，粮层温度降温速率逐渐减小；随着单位通风量的增大，粮堆的降温效果更好。

Study on temperature field in tall bungalow based on geosynclinal ventilation

[Objective] In order to study the effects of geosynclinal ventilation on the temperature of tall bungalow warehouse. [Methods] The numerical simulation software COMSOL was used to conduct numerical simulation of temperature field under mechanical ventilation for 96 h for tall bungalow warehouse with size of 60 m×24 m and loading height of 6 m. By establishing the mass conservation equation, momentum conservation equation and energy conservation equation, the variation of temperature field in the warehouse under different ventilation modes was analyzed, and the numerical simulation of different unit ventilation conditions was extended. [Results] After mechanical ventilation for 36 h, most of the grain pile below the grain line in the warehouse had dropped to 15 ℃, and after mechanical ventilation for 96 h, the temperature of the grain pile had dropped to below 15 ℃, the grain layer temperature at the distance of 1~6 m from the bottom of the warehouse all dropped below 15.2 ℃. By changing the unit ventilation rate [q=3 m³/(h·t) to q=8 m³/(h·t)], the cooling rate of the grain pile became faster. [Conclusion] The temperature of the grain pile decreases gradually from the bottom of the bin and spreads in an arc shape under the geosynclinal ventilation condition. The grain layer 1 m and 2 m away from the bottom of the warehouse is affected by the fluctuation of external environment temperature, and the temperature gradually decreased in the fluctuation. With the increase of the distance between the grain layer and the bottom of the warehouse, the temperature fluctuation gradually disappears. The temperature change of grain pile in the bin appears a certain lag, and the cooling rate of grain layer temperature decreases with the increasing distance from the bottom of the bin, and the increase of the unit ventilation rate makes the grain pile get better cooling effect.