基于混合长度理论的巷道风速场规律研究

Research on Distribution Law of Wind Speed Field in Roadway Based on Mixed Length Theory

为研究巷道断面风流风速分布规律,准确测定风速大小,根据普朗特混合长度理论建立的粘性应力与速度梯度关系与湍流运动基本方程式相结合,运用量纲分析法,分析平均风速与巷道断面任一点风速的关系,并在实验巷道和井下进行现场实测,得出巷道风流风速分布规律。结果表明,巷道断面任一点风速与平均风速比和实测点位置存在一种线性关系。针对煤矿井下巷道断面风速分布进行研究可以为准确计算巷道风量及平均风速提供参考,并为风速传感器布置提出指导意见。

In order to study the wind speed distribution law of the tunnel section and accurately measure the wind speed,the relationship between the viscosity stress and the velocity gradient established by Prandtl’s mixed length theory and the basic equation of turbulent motion are combined.The relationship between the average wind speed and the wind speed at any point of the tunnel section is analyzed by using the dimensional analysis method,and the distribution law of the wind speed of the tunnel section is obtained through field measurement in the underground.The results show that there is a linear relationship between the wind speed at any point of the tunnel section,the average wind speed ratio and the measured point location.The research on the wind speed distribution of the underground tunnel section can provide a reference for the accurate calculation of the air volume and the average wind speed of the tunnel,and provide guidance for the arrangement of wind speed sensor.