高温热源对采空区气体微流动场影响模拟研究

The Simulation on Effects of Micro-flow Air in Goaf from Heat Source with High Temperature

由于采空区内部存在遗煤,工作面的风流会扩散到采空区内部,风流中带入的氧气会氧化遗煤形成高温点,遗煤氧化产热会影响采空区内部的气体流动。文章利用GAMBIT对采空区进行建模,基于FLUENT软件对不同高温热源影响下的采空区气体流动场进行数值模拟。研究表明:采空区内部热源温度的升高会扩大内部温度的影响范围;热源引起的温度势差会引起采空区气体的微小流动,热源周围会形成气流增速流动区域和气流减速流动区域;高温热源会使采空区气体温度升高,导致气体黏度和气体流动阻力增大,最终使气体流速降低。

Because of the residual coal in the goaf, oxygen from the air flow that is from working face oxidize the residual coal and form the high temperature point. The heat produced from residual coal oxidation can influence of gas flow in the goaf. In this paper, using GAMBIT to modeling the goaf, then the air flow field in the goaf under the pressure changing is simulated based on the hydrodynamics software FLUENT. The research shows that ： the rise of the temperature of the heat source will expand the extent of influence of inside temperature ; the temperature difference caused by the heat source will cause micro - flow of gas in the goal, and some areas around the heat source form the accelerating zone and speed - down zone; the high temperature heat source will raise the gas temperature in the goaf area and lead to gas viscosity and gas flow resistance increase, and ultimately reduce the gas flow rate.