【摘要】 掘进工作面压入式通风形成的风流是贴附射流。根据流体力学和射流理论 ,通风射流体结构分为起始段和主体段。风筒出口风流是新鲜的 ,射流周围气体中污染物浓度高于射流体的浓度 ,与射流气体存在浓度差。因此 ,其通风射流为浓差射流。笔者分析了贴附射流主体段、起始段的轴心浓差和质量平均浓差 ,得出了计算模型。同时为研究压入式通风过程中污染物的分布提供了新的理论依据更多还原

【Abstract】 The air current from forced ventilation is a wall-attached jet in the heading face. The jet may separate into two parts, i.e. the initiation sector and the main sector based on the fluid dynamics and jet theory. Since the air from the pipe outlet is fresh, and the pollutant concentration around the jet is greater than that in the jet body, the concentration difference is formed between the jet and the air around. Therefore, the ventilation jet is called the concentration difference jet. In this paper, the axis concentration difference and the average quality concentration difference of the main and the initiation body sectors of the jet current are analyzed respectively, from which a calculating model is established. The results provide a new theoretical basis for the study on the distribution of the pollutants from the forced ventilation process.更多还原