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移动热源对掘进巷道热环境参数的影响研究

Study on the influence of mobile heat source on the thermal environment parameters of roadway

  • 摘要: 以铲运机为例的移动热源在运行过程中产生的热量会传递至掘进巷道,继而影响巷内风流温、湿度的分布。在云南某矿掘进巷道进行现场实测试验,以现场实测数据为基础,建立了与实际生产设备一致的移动热源几何模型,基于组分输运模型以及自然对流传热类型下的Realizable k-ɛ湍流模型,采用重叠网格法、动网格法对移动热源影响下风流温、湿、焓的纵向、垂向及横向分布规律进行了数值模拟,并结合现场实测数据验证了模拟的准确性。研究结果表明:运行中的移动热源极大程度的影响了巷内宏观温度场的结构状态;移动热源运行周期试验中,近工作面处风流温、湿度随远离工作面而缓慢上升,距工作面12 m处测得风流温度以及相对湿度的峰值分别为32.35 和92.46%;风流焓值符合规则性概率分布,拟合的焓值概率密度分布曲线与标准正态分布曲线间极度重合,说明移动热源运行环境内风流焓值符合正态分布特征;移动热源运行区域的中段及近壁面处出现高焓区域,峰值为89.80(kj/kg空气);同种监测环境下,不同监测组别下的风流焓值平均值、中位数组间差值均小于2%。

     

    Abstract: The heat generated by the moving heat source in the running process of the scraper will be transferred to the driving roadway, and then affect the distribution of air temperature and humidity in the roadway. Field test was carried out in a mining roadway in Yunnan Province. Based on the field measured data, a moving heat source geometric model consistent with the actual production equipment was established, and a Realizable K-turbulent model based on component transport model and natural convection heat transfer type was established. The vertical, vertical and transverse distribution of air temperature, humidity and enthalpy under the influence of moving heat source is simulated by using the overlapping grid method and the moving grid method, and the accuracy of the simulation is verified by field measurement data. The results show that the moving heat source affects the structural state of the macroscopic temperature field in the roadway; The air temperature and humidity near the working face increase with the distance from the working face. The peak values of air temperature and relative humidity measured 12 m away from the working face are 32.35℃ and 92.46%; The enthalpy of air flow conforms to the regular probability distribution, and the probability density distribution curve of enthalpy value coincides with the standard normal distribution curve, indicating that the enthalpy of air flow in the operating environment of the moving heat source conforms to the normal distribution characteristics. High enthalpy area appeared in the middle and near the wall of the heat source operating area, with a peak value of 89.80 (kj/kg air); The difference between mean and median array of air flow enthalpy values under different monitoring groups is less than 2%.

     

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