Pressure losses in mine ventilation systems are estimated using friction factors and shock loss factors. The efficient planning and designing of mine ventilation systems depend on the accuracy of the friction factors as well as the shock loss factors that are taken into consideration. While there is a much more acceptable knowledge of what constitutes friction loss in mine roadways, the shock loss factors are in general readily not available for all possible contexts of flow separation phenomena in mines. One such special case of shock loss in mines is the train of mine cars in the airway. Mine cars are widely used for the transportation of material, and the information on shock loss factor for mine cars is limited. This paper examines the pressure loss occurring due to a train of mine cars in an airway using scale model studies and numerical investigations. Computational fluid dynamic (CFD) studies are conducted using four different turbulence models. The performance of different turbulence models is analyzed by comparing it with the experimental results. The study suggests that the boundary layer resolution method is significant in the simulation of shock loss. From the study, it is found that the shock loss factors from presently available model overestimate the pressure loss by 7 to 15 times. A better prediction model for the shock loss factor of a train of mine cars in the airway is proposed using the experimental results.

中文翻译：

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用于估计地下航道中矿车列车气动压力损失的新预测模型

矿井通风系统中的压力损失是使用摩擦系数和冲击损失系数估算的。矿井通风系统的有效规划和设计取决于所考虑的摩擦系数和冲击损失系数的准确性。虽然对于矿井巷道中摩擦损失的构成有更容易接受的知识，但冲击损失因子通常并不适用于矿井中流动分离现象的所有可能背景。矿井中震动损失的一种特殊情况是气道中的矿车列车。矿车广泛用于物料的运输，关于矿车冲击损失系数的资料有限。本文使用比例模型研究和数值调查研究了由于一列矿车在气道中引起的压力损失。计算流体动力学 (CFD) 研究使用四种不同的湍流模型进行。通过与实验结果的比较，分析了不同湍流模型的性能。研究表明，边界层分辨率方法在冲击损失的模拟中具有重要意义。从研究中发现，现有模型的冲击损失因子高估了压力损失 7 到 15 倍。结合实验结果，提出了一种较好的矿车列车航道冲击损失系数预测模型。通过与实验结果的比较，分析了不同湍流模型的性能。研究表明，边界层分辨率方法在冲击损失的模拟中具有重要意义。从研究中发现，现有模型的冲击损失因子高估了压力损失 7 到 15 倍。结合实验结果，提出了一种较好的矿车列车航道冲击损失系数预测模型。通过与实验结果的比较，分析了不同湍流模型的性能。研究表明，边界层分辨率方法在冲击损失的模拟中具有重要意义。从研究中发现，现有模型的冲击损失因子高估了压力损失 7 到 15 倍。结合实验结果，提出了一种较好的矿车列车航道冲击损失系数预测模型。