冷藏运输厢内流场和温度场协同控制

Cooperative Control of Flow Field and Temperature Field in Refrigerated Transport Carriage

基于杨梅多孔介质特征推导热传导平衡方程,在冷藏车厢物理模型中分析了流场的流动特性,得到了车厢内各横、纵截面的流场和温度场的分布状况。采用协同控制车门右侧顶部隔热气帘风机,使其风向垂直于等温线方向间歇性定速运行,实车温度数据采集显示横截面最高温度由3.8℃降至1.67℃,在沿长度方向截面3层中温度标准差最大值为0.387。结果表明,仅调节冷风机转速无法有效改善温度均匀分布,根据等温线梯度方向和流线切线夹角开启隔热气帘风机协同调节风向,能够有效改善温度场均匀性分布程度。

Heat balance formula of red bayberry was developed. The air flow and temperature field heterogeneity＇s properties of flow field in refrigerated transport carriage＇s physical model and the distributions of flow field and temperature field in cross sections and longitudinal sections were analyzed. The wind direction of top right adiabatic gas curtain was set perpendicular to isothermal curves to control the gas curtain fan with constant speed intermittently based on coordination principle. The test data of refrigerated transport carriage showed the highest temperature in cross sections dropped from 3.8℃ to 1.67℃ , the biggest standard deviation amplitude of temperature values was 0. 387 in three cross sections with length direction. The results indicated that only accelerating the gas curtain fan＇s speed could not improve the temperature distribution homogeneity effectively, opening the adiabatic gas curtain and adjusting the wind direction in included angle of gradient direction of isothermal curves and tangent direction of flow line based on cooperative principle could improve the temperature distribution homogeneity effectively.