独头巷道受限贴附射流有效射程的理论研究与数值计算

为了探讨独头巷道受限贴附射流通风有效射程，利用巷道断面面积与风筒出流射流直径，定义了独头巷道射流的受限程度，采用理论分析与数值计算方法，推导了受限射流无因次距离与沿程断面位置、断面流量和断面平均流速之间的关系式，建立了独头巷道受限贴附射流流动特性模型。利用该模型，开展了8个不同工况下受限贴附射流的数值计算。结果表明，在受限的情况下，射流区无因次最大截面积出现在无因次距离为0.200 0处，而无因次最大截面流量位于无因次距离为0.187 5处。理论推导和计算结果表明，所得模型和计算方法能更为准确预测受限贴附射流的有效射程。

Theoretical research and numerical calculation of effective range for restrained wall-attached jet flow in heading face

In order to discuss the effective range for restrained wall-attached jet flow in heading face, the restrained degree of jet flow in a heading face was defined by using the sectional area of heading face and the diameter of jet flow at the outlet of air duct. Through theoretical analysis and numerical calculation, the relation of dimensionless distance with sectional position, sectional flow rate and sectional average velocity along the jet flow was deduced, and a model of flow characteristics for restrained wall-attached jet flow in heading face was constructed. The numerical calculation on restrained wall-attached jet flow under 8 different conditions was conducted by using this model. The results showed that under the restrained circumstance, the maximum dimensionless sectional area in the jet flow region presented on the position with dimensionless distance as 0.2000, while the maximum dimensionless sectional flow rate presented on the position with dimensionless distance as 0.1875. It showed that the model and calculation method can predict the effective range for constrained wall-attached jet flow in heading face more accurately.