水平转弯颗粒流的离散元模拟

为了研究水平转弯输运物料时颗粒流的动力特性以及物料颗粒对输送带的作用机理,在离散元理论基础上,采用非线性HertzMimdlin接触模型,建立了水平转弯输运的离散元模型。以不同的角速度模拟测试颗粒平均速度,与计算的带中央切向速度相比,获得了一组比较接近的数字。说明所采用的接触模型和材料的物理参数是正确的。研究了两组不同的颗粒单元、4种滚动摩擦系数下的颗粒动力特性,发现颗粒平均速度与颗粒单元、滚动摩擦系数无关。通过输送带加速运行,模拟了料流分布以及料流对输送带外侧压力分布的影响。结果表明,随着带速的增加,带外侧平均压力逐步增加,而最大压力非线性地剧增。

Discrete element method simulation of granular flow on horizontalturn

In order to study the dynamic characteristics of the granular flow on horizontal turn during material conveyance and the action mechanism of the material granule on the conveger belt, a discrete element model was built for the horizontal turn conveyance by the nonlinear Hertz Mimdlin contact model based on the theory of discrete element method. By simulating the average speed of the tested granule at different belt angular velocities, a set of numerical values close to the calculated tangential speed of the middle of the conveyer belt were obtained, it showed that the introduced contact model and the physical parameters of the material are correct. The dynamic characteristics of 2 groups of granule element under 4 rolling friction factors were investigated. It was found that the average speed of the granule is irrelevant to the granule element and the rolling friction factor. The effects of the granule flow rate and its distribution on the lateral pressure distribution on the outside wall of the conveyer belt were simulated under the belt acceleration, and the results showed that the average lateral pressure increases along with the belt speed, and the maximal pressure sharply increases nonlinerly.