Study Of Greenhouse Agriculture System Multiphase Flow In Shannan

Due to the special climate and geographical conditions, the traditional agriculture development in Shannan suffers many limits. Greenhouse agriculture can effectively breaks the limits of extreme climate conditions, thus the greenhouse agriculture has a rapid development in recent years. With the development of precision agriculture, precision control of greenhouse environment has attracted more and more attention of people.The present study aimed at glass greenhouse which is widely used in Shannan, developing a CFD model of greenhouse. The spatial variations of temperature and humidity have been predicted. The validity of CFD model has been verified by comparing the simulated values and test values in literature. Then the distribution of temperature, humidity, and velocity inside fan-pad greenhouse in Shannan has been simulated. Finally, several pieces of advice has been adopted about the appropriate crops in greenhouse. The main research contents are as follows:(1)The environment parameters of the greenhouse in Shannan on fair weather in last summer have been obtained.(2)The greenhouse model have been simplified after analyzed the main factors, and the mathematical model was then established. A 3D model of greenhouse was established, also standard k-? model were adopted to simulate the fluid flow in greenhouse. Meanwhile, the DO radiation model was chosen.(3)To verify the accuracy of the model, a comparison of test in literature and modeling results has been taken, while all the parameters taken from the environment of test greenhouse. The model results then showed a great agreement with test values.(4)Then after all that, the boundary conditions has been set as parameters in Shannan, the distribution of temperature and humidity in fan-pad greenhouse has been analyzed. Aiming at the regional distribution of temperature and humidity in greenhouse, the present study put forward that different crops can be planted in different regions in greenhouse. This provided guidance for the choice of crops in greenhouse in Shannan.(5)The distribution of temperature and relative humidity in greenhouse under different fan outlet velocity has been compared, also the influence of velocity on temperature and humidity at different heights has been analyzed. That provides a certain reference for the regulation of greenhouse.