基于数值实验的分支阻力调节度研究

应用数字实验方法 ,通过调节分支风阻 ,研究它对通风系统的影响。研究结果表明 ,当一些分支风路的风阻调到接近完全隔断风流的极大值时 ,网络分析结果仍然正常 ,不影响迭代技术 ,同样也说明了分支风阻预先输入的可行性。各分支风阻的变化对通风系统的影响程度是不一样的 ,这由分支在通风网络中的位置决定。同时分析了通风系统中两风机的相互影响的情况。

基于灵敏度的通风系统稳定性分析

通风网络中任一分支风阻的变化都可能引起自身以及相关分支甚至网络中所有分支的流量变化,变化程度的度量指标为灵敏度。在对通风网络中分支灵敏度及其性质进行深入分析的基础上,给出了使每一条分支的风流保持稳定、整个通风网络保持稳定、两分支间稳定性比较和两通风网络稳定性比较的判别式,对于通风系统稳定性分析、日常通风管理具有重要意义。

Method of branch ariflow for calculatinga complicated mine ventilation networks

The solutions widely used at present for calculating complicated mine ventilation networks are ones in which resistance of the branches and characteristic parameters of the fans are taken as basic input data. But it is time and energy consuming to obtain the branch resistance values. A new solution is developed in this paper in which the branch resistance values are obtained through measuring and evaluating the airflow of the whole ventilation network. Theoretical analysis is made of the establishment of a linear equation series with branch resistance as unknown numbers, an equation series for which one, and only one, result of solutions exists. This solution is programmed in C language and passed on a personal computer. The programmed solution programmed proves of practical use, as demonstrated by specific examples. Being different from other solutions, the method takes the branch airflow and fan working points as basic input data, and the present solution is of greater advantage for calculating ventilation networks of mines in operation.

通风网络解算初始风量确定方法

矿井通风网络解算前,各分支风量的初值直接影响网络解算的速度和迭代是否收敛。分析了影响通风网络各分支风量分配的3个因素:网络拓扑结构、矿井总风量和分支本身的风阻;提出了确定通风网络解算初始风量的新思路,把通风网络的独立通路当作并联通风路线,利用矿井总风量和通路风阻计算各通路的风量,再分到每个分支中。通过一个网络图示例说明了使用该思路提出的方法,给出了通风网络解算初值与网络解算真值的误差,除角联分支外都不超过20%。