高大平房仓粮堆插管机械通风数值仿真研究

摘要

对平房仓粮食通风中空气流速分布问题进行 CFD 数值模拟。考虑粮仓压力的分布，针对通风笼式通风中所采用的通风笼进行独立建模分析，获得其阻力和风速关系数据。并将其应用于粮仓整体数值模型中，提升了模拟的真实性。基于某粮库所采用的粮堆“插管”技术进行粮堆插管模拟，并对插管效果进行评估。结果表明：通过粮堆插管的合理布置，可使粮食内部空气流动速度得到有效改善。通过对插管附近流场、压力场的观察，给出了插管提升通风效果的原理和插管优化设计的方向。%The air speed distribution of grain ventilation in horizontal warehouse which is usually con-cerned is investigated by using CFD numerical simulation.Carefully considered air pressure distribution in the barn.Established independent numerical model for the ventilation cage of the cage ventilation method, obtained its pressure drop versus velocity data,and applied it to the full numerical model of the barn,im-proved the reality of the simulation.And simulated ventilation tubes in grain heaps based on the tube in-sertion technology from some barns.It is observed from the test result that air speed in the grain is effec-tively improved by reasonable arrangement of the ventilation tubes.Proposed the theory of the improve-ment of the ventilation effect by tube insertion and the direction of optimal designing of the ventilation tube through the observation of the flow field and pressure field nearby ventilation tubes.