基于CFD的微型植物工厂湿热环境数值分析

为进一步提高植物生长信息的精确检测与培养环境的优化调控,基于计算流体动力学对微型植物工厂内部空气传输过程进行三维数值模拟,从而分析得出内部温湿度场的分布模式。通过仿真分析与实验测试结果的对比研究表明:微型植物工厂培养箱内部温湿度场受气流场的影响分布不均匀,风速高的区域温度相对较低。相对湿度与温度呈现强烈的耦合关系,相对湿度模拟值与实测值平均相对误差为5.38%; 温度模拟值与实测值平均误差为0.875 ℃,平均相对误差为4.41%,数值模拟结果与试验测试结果吻合度较高。相对湿度分布与对应的温度分布模式类似,中部植物生长培养区的温湿度分布均匀一致,其余空间温湿度分布梯度明显且顶部温度高湿度低,底部温度低湿度高,整体分层明显,需要对培养箱进行结构优化,减少温湿度分层现象,以更好地促进植物的生长。
With the rapid development of computational fluid dynamics(CFD)technology, the application of information acquisition based on fluid mechanics technology for the monitoring of plant growth information can scientifically help researchers to dynamically grasp the changes of plant growth information and effectively promote the healthy growth of plants. The use of efficient plant growth information monitoring methods for real-time control of the culture environment is an important indicator and main feature of plant development. Therefore, the technology for effectively monitoring plant growth information and optimizing culture environment is important for current plant modernization and information development. In order to further improve the accurate detection of plant growth information and optimize the regulation of culture environment, based on the CFD, this paper developed the three-dimensional numerical simulation of air transport process in micro plant factory, so as to obtain the distribution mode of internal temperature and humidity field. In the numerical simulation, the plant factory model was established, and the models such as turbulence model, component transfer model and porous media model were selected. Through comparative investigation with simulation analysis and experimental validation, the results show that the micro plant factory incubator of internal temperature and humidity field affected by the flow field distribution is not uniform, and the temperature of the area of high wind speed is relatively lower. There is a strong coupling relationship between the relative humidity and temperature. The relative error between simulated and measured values of relative humidity is 5.38%, the average error between simulated and measured temperature is 0.875 ℃, and the average relative error is 4.41%. The relative humidity distribution and corresponding temperature distribution patterns are similar to that of the central plant growth culture temperature and humidity area distribution uniformity. The temperature and humidity gradient distribution of the remaining space is obvious. It indicates that the high temperature/low humidity at the top, and low humidity/high temperature at the bottom.