Experiment and Numerical Simulation of Grain Temperature Field in Underground Ecological Granary
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Abstract:
Grain temperature is an important factor affecting grain security. The variation of grain temperature in underground ecological granary was analyzed by combining simulation test silo, engineering test silo and numerical simulation. The temperature change law of each measuring point was obtained by setting up the measuring cables in the test silo and monitoring the temperature at regular time. Basing on the boundary conditions of grain storage environment, the physical model of underground simulation test warehouse was established, and the grain temperature field in the warehouse was analyzed by numerical method. The effectiveness of numerical simulation method was verified by comparing with the test results. By using the same numerical simulation method, the grain temperature field of underground-engineering-test warehouse with different entry time was analyzed; it was found that loading in winter was better than in summer. In order to realize low temperature grain storage, appropriate ways (such as ventilation in the winter) should be taken for the grain to reduce the grain temperature, because the temperature was high in summer. It was found that the grain storage effect of deep underground silo (engineering test silo) was better than that of shallow depth underground silo (simulation test silo). The grain temperature in the underground ecological granary was gradually tended to be stable with the increasing storage time. The grain temperature of simulation test silo was about 20 degrees. The engineering test silo was about 17 degrees. The above-ground silo was about 25 degrees; the local temperature of the above-ground silo was as high as 30 degrees, and varied greatly with the seasons. Therefore, the underground ecological silo had the advantage of constant low temperature grain storage, which could ensure grain quality and grain storage safety.
