摘要
为了研究秸秆类颗粒的流化运动特性,针对细长颗粒的形状特征,将细长颗粒沿长度方向上离散化后分别计算各离散段在气流场中的受力,从而建立细长颗粒的运动数学模型;利用碰撞模型来处理颗粒与墙壁之间的碰撞;采用欧拉-拉格朗日方法计算追踪气流场中颗粒的运动,模拟了细长颗粒在气相场中的运动特征,发现颗粒在运动过程中的空间倾角存在明显的取向性,且与实验结果相符.还讨论了影响细长颗粒计算稳定性和精度的几个关键因素,结果发现,细长颗粒作离散化处理后,对长度方向上的气流场速度分布比较敏感,因此,为了保证计算精度,在进行气相场网格划分时对网格尺度要求很高,同时细长颗粒离散程度对计算精度也有很大影响.
In order to study its fluidized behavior, the slender particle was divided, based on its characteristics, into several parts for force analysis. A new mathematical model for the movement of the slender particle was established, and the collision model was used to handle the collision between the particle and the wall. The movement of the particle in the gas field was simulated vividly by using this model, and the orientation was found, which was in accordance with the experiment. Some critical factors that affect stability and precision were discussed. It turned out that the slender particle was sensitive to the grads of velocity of the gas field. More fine grids of the gas field were required for the exact results. And the grids of the particle played an important role in the process.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第4期345-349,共5页
Journal of Combustion Science and Technology
基金
中国烟草总公司郑州烟草研究院烟草行业工艺重点实验室开放基金资助项目
关键词
细长颗粒
颗粒离散模型
取向性
数值模拟
slender particle
divided particle model
orientation
numerical simulation
