基于CFD的自然通风玻璃温室湿热环境模拟与测试

Simulation and test of heat and humidity in natural ventilated glasshouse by CFD method

基于计算流体动力学(CFD)数值方法,以Venlo型2连栋玻璃温室为研究对象,采用离散坐标(DO)辐射模型和组分传输模型对室内空气的传输过程进行3维数值模拟,以提出在温室微环境模拟中采用辐射、对流、热传导耦合计算的新方法,从而得出温室内温度和相对湿度场的分布模式。结果表明:相对湿度模拟值与实测值平均相对误差为5.4%,温度模拟值与实测值平均相对误差为11.2%。温室内相对湿度空间分布与对应的温度分布模式类似,中部作物区温湿度分布均匀一致,其余空间温湿度分布梯度明显。

The temperature and humidity profiles affect crops growth inside glasshouse.The 3-D numerical simulation was done based on the computational fluid dynamics（CFD） technique for the natural ventilated bi-span Venlo glasshouse.The DO radiation and species transfer models were used to simulate the mixing air transferring processing.A new couple computational method for the radiation and convection and conduction was introduced into greenhouse microclimates.The inside temperature and humidity profile patterns were obtained.The results showed that the average error was 5.4% between the simulated and the measured values for the relative humidity,respectively,and it was 11.2% for the temperature simulated and measured values.The relative humidity distribution pattern was similar to the corresponding temperature.A homogeneous temperature and humidity fields were observed at the middle of greenhouse,whereas the gradient profiles were obvious in other volume inside greenhouse.