不同粮种横向通风和地上笼上行通风粮层阻力模拟研究

The numerical and experimental study on the ventilation resistance of three stored grains during horizontal aeration and vertical aeration using half- round perforated duct on the floor

机械通风是保证储粮品质的主要技术手段,平房仓储粮机械通风方式可分为地上通风笼通风与横向通风,其中不同粮种粮堆的通风阻力也不尽相同。对3种孔隙率不同的粮种(小麦、稻谷、玉米),采用计算流体动力学(Computational Fluid Dynamics,CFD)的方法,分别以横向通风和U型一机三道地上笼上行通风时粮层阻力进行数值模拟研究,得到不同粮种在不同通风方式下的通风阻力数据,并与实验数据进行了对比,分析了其粮层阻力变化规律,为机械通风系统的风机选型及通风系统的优化奠定基础。

Mechanical ventilation is the main measure of ensuring the grain’s safety and quality.The me-chanical ventilation of the grain storage in warehouse can be divided into the horizontal ventilation and the vertical ventilation.The ventilation resistance varies with different grain variety and grain bulk.According to Computational Fluid Dynamics(CFD)method,numerical simulation analysis of horizontal ventilation and vertical ventilation resistance of three kinds of grains(wheat,paddy and corn)in grain bulk is conduc-ted.The foundation for the fan selection of the mechanical ventilation system and the optimization of venti-lation system was laid through the comparison between the ventilation resistance under different grains’ ventilation pattern and the experimental data,with the analysis of its grains’layer resistance variation.