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以济南地区植有番茄的日光温室为研究对象,基于试验观测,利用计算机流体动力学(computational fluid dynamics,CFD)数值模拟技术,采用标准的κ-ε湍流模型以及离散坐标(DO)辐射模型,对济南地区冬季温室自然通风条件下气温分布进行3维数值模拟。结果表明:CFD能够较好地模拟自然通风条件下温室内气温变化特征,气温实测值和模拟值平均误差为0.9℃,在济南地区冬季晴天不同风向以及对应平均风速条件下,通风16~23min即可达到作物适宜气温;风向为NE、ENE、E、ESE、SE、SW时温室内南北气温相差3℃左右,南侧东西部气温相差4℃左右,风向为SSW时,温室内南北相差4℃左右,东西部气温相差1℃左右。研究结果可为日光温室的结构优化和生产管理提供科学依据。
Based on the experimental observations, a computer-aided numerical simulation of computational fluid dynamics (CFD) was performed using a standard κ-ε turbulence model and a DO (Discrete Co-ordinate) radiation model. Three-dimensional numerical simulation of temperature distribution under natural ventilation in winter greenhouse in Jinan area. The results show that CFD can better simulate the temperature variation in greenhouse under natural ventilation. The average error of measured temperature and simulated value is 0.9 ℃. Under different wind direction and corresponding mean wind speed in sunny winter in Jinan, CFD is 16 ~ 23min The temperature of the greenhouse can reach the suitable temperature of the crops; when the wind direction is NE, ENE, E, ESE, SE, SW, the difference between the north and south temperatures in the greenhouse is about 3 ℃, the temperature between the east and the west of the south is about 4 ℃, Around the temperature difference between east and west about 1 ℃. The results can provide a scientific basis for the structure optimization and production management of solar greenhouse.