巷道转弯区域流场特征及局部通风阻力系数计算研究

Study on flow field characteristics and calculation of local ventilation resistance coefficient for turning areas of roadway

为了得到准确的巷道转弯区域局部通风阻力系数计算公式,以山西王坡煤业有限公司南集中回风巷与上寺头回风巷转弯区域为研究对象,构建巷道转弯区域流场CFD计算模型,模拟分析了巷道转弯区域气压分布规律以及沿程局部阻力损失特征,通过对比现场实测结果、CFD模拟结果、经验公式计算结果,论证了CFD模拟方法能够准确计算巷道转弯区域局部通风阻力,采用CFD模拟与数值分析相结合的方法构建了以风量和转弯角度为自变量的巷道转弯区域局部阻力系数计算公式。研究表明:巷道转弯区域沿程通风阻力损失具有"前大波峰-后小波峰"双波峰型特征,采用CFD模拟与数值分析相结合的方法构建的巷道转弯区域局部阻力系数计算公式不仅能预测新掘转弯巷道的通风阻力,也能为矿井风网解算提供准确的风阻参数。

This paper presents results of a computational fluid dynamics( CFD) study,based on which a mathematical model is developed to calculate the local ventilation resistance coefficient of roadway turning areas. The turning areas of two return airways,namely Jizhong return airway and Shangsitou return airway in Wangpo Coal Mine were selected as the study areas. From the CFD model,the pressure distributions in the roadway turning areas and the local pressure loss along the turning areas were analyzed. The simulation results were then compared with field measurements and empirical formula to calculate ventilation resistance in roadway turning areas. The results indicate that the CFD simulation can accurately simulate local ventilation resistance in roadway turning areas. Combining numerical analysis with CFD simulation results,a formula was established to calculate the local ventilation resistance coefficient from air flow and turning angle in turning area of roadways. The results show that the ventilation pressure loss along roadway turning areas is "front big wave peak-back wavelets peak"double wave peak type. This local resistance mathematical model for roadway turning areas could be used to predict the ventilation resistance of newly developed curved roadways,and could also provide accurate wind resistance parameters for the calculation of mine air network.