Flow characteristics of three-phase foam in mine gob and its application

To study the flow characteristics of three-phase foam in gob area, different perfusion experiments in coal mine gob were designed and put forward in the paper. Through the observation of flow range, flow characteristics of three phase foam were analyzed with different flow rates. And, unsteady seepage process of three-phase foam was simulated with CFD software. Base on experiment and numerical simulation results, flow characteristics of three-phase foam and its major influence factors are discussed, and the optimal arrangement distribution of mine fire control drills is also determined. Research results show that the flow range and stacking height of three-phase foam in gob are significantly influenced by gravity. The vertical stacking height and horizontal diffusion distance of three-phase foam are also directly related to the flow volume of foam perfusion, the larger flow single hole perfusion volume, the higher stacking height and the longer diffusion distance could be obtained.