摘要
The control equations of gas concentration field in gob areas with a known velocity field are partial differential equations with variable coefficients,whose traditional mathematical calculation methods are very complex.A numerical simulation method can be used to calculate the gas concentration field,but it also needs considerable amounts of computer resources and the relations of gas concentration at different points of the gob area are undefined.Based on the model of stream tubes,the conservation equations of mass and gas components within the stream tube are used to deduce the equations of a gas concentration field in a gob area with a known velocity field.This method of calculation of a gas concentration field is applied in a gob area with a U-type ventilation working face,which suggests that this new method has the virtue of exact calculations is simple to operate and has a clear physical interpretation.
在有已知的速度域的嘴区域的煤气的集中地的控制方程是有可变系数的部分微分方程，谁的传统的数学计算方法是很复杂的。一个数字模拟方法能被用来计算煤气的集中地，但是它也需要计算机资源的可观的数量，在嘴区域的不同的点的煤气的集中的关系是未定义的。基于流试管的模型，在流试管以内的集体、煤气的部件的保存方程被用来与已知的速度域在一个嘴区域推出煤气的集中域的方程。一块煤气的集中地的计算的这个方法在一个嘴区域被使用， U 类型通风工作面对，它建议这个新方法有准确计算的优点简单操作并且有清楚的物理解释。
基金
Financial support for this work,provided by the Doctor Startup Foundation of Xi'an University of Science & Technology
