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

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-ɛ 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%.