气垫带式输送机气垫横向出流理论模型的研究

Modelling of latitudinal flow field in air-cushion belt conveyor

以流体力学缝隙流流动理论为基础,给出气垫横向出流简化的N-S二维流动方程和连续方程,并对气垫缝隙流的具体流动模型展开了讨论。目前一些文献多将气垫简化为平行平板缝隙流流动模型,基于气垫厚度沿横截面分布的研究,本文提出了斜平板缝隙流流动模型。给出2种模型的气垫压力分布曲线,运用CFD软件对2种模型作了数值模拟,结果表明由斜平板得到的气垫压力分布曲线与静力平衡得到的更接近,所以用斜平板缝隙流流动模型来解释气垫横向出流比平行平板流动模型更合理。

Based on gap flow theory of hydromeohanics, it gives two - dimension N - S equation and continuous equation of htitudinal flow of air - cushion, and discuses the model of gap flow of air - cushion. The paper presents a new model, a gradient slab flow model, instead of parallel one, gives the pressure distribution curves of air - cushion for the two models and makes a numerous simulation d＂ two models using CFI） software. The results show that the pressure distribution curve for the gradient one is closer to be actual value than the parallel one. So it is more reasonable to use gradient slab flow model to explain latitudinal flow of air- cushion instead of the parallel one.