矿井防尘供水管网相似试验模型构建与测点优化

依据水力相似理论,提出了构建与矿井防尘供水管网等效的相似试验模型的理论方法,基于流体力学基本方程和量纲分析法,结合重力相似准则和压力相似准则,推导出矿井防尘供水管网与其相似模型主要物理指标之间的关系,运用EPANET水力模拟软件求解最大防尘用水量下管网原型与模型水力工况并进行误差分析。结果表明,管网原型与变态相似模型对应管段的流量、流速和压差相似比尺的平均相对误差分别为0.20%、0.46%和-4.20%,验证了相似试验模型构建的合理性和可行性。同时,为进一步实现对相似物理模型水力工况的有效监测,基于信息理论和相关系数构建测点优化数学模型,并结合日防尘用水需求的动态水力模拟,对压力监测点进行优化布置。

Construction of similar test model for mine dust-proof water supply network and optimization of pressure monitoring layout

Based on the hydraulic similarity theory,a theoretic method for establishing a similar test model equivalent to the mine dustproof water supply network was proposed. Based on the basic equations of fluid mechanics and the dimensional analysis method,combined with the gravity similarity criterion and the pressure similarity criterion,the relationship between the main physical indicators of the water supply pipe network and its similar model was derived.The EPANET hydraulic simulation software was used to solve the pipe network prototype and model hydraulic conditions under the maximum dust-proof water consumption,and the error analysis was performed.The results show that the average relative errors of similar ratios for volume flow rate,velocity and head difference were calculated to be 0. 20%,0.46% and-4.20% respectively,verifying the rationality and feasibility of similar test model construction. At the same time,in order to further effectively monitor the hydraulic conditions of similar physical models,an optimized mathematical model of measuring points was constructed based on information theory and correlation coefficients,and the dynamic hydraulic simulation of daily dust water demand was used to optimize the arrangement of pressure monitoring points.