综采工作面风流-粉尘运移规律的数值模拟

Numerical Simulation on Wind-Dust Migration Regularity in Fully-Mechanized Working Face

针对综采工作面粉尘浓度居高不下的问题,基于风流场和颗粒场特点,建立三维k-ε湍流模型,并利用混合差分格式和基于同位网格的SIMPLE算法作为风-尘颗粒两相流的数值解法,利用FLUENT软件进行数值模拟。通过与现场实测数据对比,发现模拟结果与实测数据相吻合。研究结果表明,最大风速可达入口风速的1.67倍,并沿程形成了长达15 m的高速风流带;从后滚筒开始的下风侧区域,粉尘浓度发生两次急剧的降低,由此提出了"三阶梯现象",用以指导现场工作和防尘作业。

This paper is aimed to ascertain the regularity of wind- dust migration in fully- mechanized working face. In view of the characteristics of wind flow field and particles flow field in fully- mechanized working face,the k- ε and wind- dust flow theory are employed to build a three- dimensional mathematical model of wind- dust migration related to the fully- mechanized working face,in which FLUENT software is adopted to conduct numerical simulation. By comparing it with in- situ data,it is found that the simulated result agrees with the in- situ one. The results of the study show that the local maximum wind speed is about 1. 67 times as large as the entrance velocity,leading a 15 m- length high speed wind zone. In the downwind region beginning from the latter roller,dust concentration reduces sharply two times,so ＂three zones phenomenon＂is put forward to guide the field production and the dustproof work.