矿井巷道风流状态“关键环”实验与数值研究

发布时间：2018-04-22 02:26

本文选题：矿井通风 + 风流分布　；参考：《中国矿业大学（北京）》2013年博士论文

【摘要】：本文实验研究了正常通风时期小尺寸规则巷道内风流的分布规律,并基于流体力学理论提出了风速分布“关键环”和“特征环”的概念。同时数值分析了同尺寸巷道内风流分布规律,并进行了实验对比验证,模拟与实验结果符合良好,并由此分析得到规则截面上“关键环”的特征方程。此外进一步数值研究了正常通风时期大尺寸不规则三心拱巷道内凸凹体尺寸及通风风速对“特征环”及“关键环”的影响规律,得到了“关键环”在凸体截面上的适用条件。同时,研究了火灾时期大尺寸三心拱巷道内火灾强度以及通风风速对温度场及流场的影响,得到了火灾期间“特征环”、“关键环”的分布规律及“关键环”在火灾时期的适用范围。探讨了“关键环”在巷道风量动态监测中的应用。研究成果为实现井下平均风速及风量的准确测量提供了新的理论支撑和技术手段,具有较大的实践应用价值。
[Abstract]:In this paper, the distribution law of wind flow in small size regular roadway during normal ventilation period is studied experimentally, and the concepts of "key ring" and "characteristic ring" of wind velocity distribution are put forward based on the theory of fluid mechanics. At the same time, the distribution of air flow in the same size roadway is numerically analyzed, and the experimental results are compared and verified. The simulation results are in good agreement with the experimental results, and the characteristic equations of "key ring" on the regular section are obtained. In addition, the influence of the size of large size irregular three-core arch roadway and the ventilation wind speed on the characteristic ring and key ring during normal ventilation period is studied numerically, and the applicable conditions of "key ring" on the section of convex body are obtained. At the same time, the influence of fire intensity and ventilation wind speed on temperature field and flow field in large-size three-core arch roadway during fire period is studied, and "characteristic ring" is obtained during fire. The distribution law of "key ring" and the application range of "key ring" in fire period. The application of "key ring" in dynamic monitoring of tunnel air volume is discussed. The research results provide new theoretical support and technical means for the accurate measurement of underground average wind speed and air volume, and have great practical application value.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TD723

【相似文献】