Research on Numerical Simulation of Reasonable Negative Drainage Pressure of Pipes in Upper Corner

In order to promote the efficiency of gas drainage in gob, numerical simulation based on basic theories of computational fluid mechanics is thus implemented towards gob during drainage through pipe in upper corner by means of Fluent. According to related results, the negative drainage pressure produces a significant impact on drainage effect, gas distribution in upper corner and air leakage in gob. As the negative drainage pressure reaches a certain level, volume of drained gas is basically steady. With increasing negative drainage pressure, gas concentration in upper corner is decreasing and scope of air leakage in gob keeps expanding and even the exception that air flows in working face move to gob emerges nearby upper corner.