Turbulence features of jet flow field in mine stopes

This paper aims to explore the turbulence features of jet flow field in mine stopes. For this purpose, a chamber model was established at the scale of 1/20 based on the similarity criterion. Then, the author obtained the average maximum jet length, width and the corresponding position, as well as the turbulent diffusion coefficient and the corresponding diffusion angle. Focusing on the turbulence features of jet flow velocity field, the distribution of turbulence intensity, skewness, flatness and Reynolds stress of the flow velocity in the crosssection were also acquired in the research. The results show that the flow velocity in the jet flow region belongs to the main airflow area when the air inlet and outlet are on the same side of the chamber, resulting in a satisfactory ventilation situation; the peak turbulence intensity in the cross-section and the peak Reynolds stress were both located near the axis and had the same order of magnitude. The research findings provide valuable references for the differentiation between the mainstream area and recirculation area in mine stopes.