淹没旋喷射流煤层割缝实验研究

n the paper, effects of pressure, diameter of the nozzle and velocity of drill pipes on cutting radius of coal seams were investigated by high-pressure submerged swirling jet flow cutting seams experiments. Results indicated that with the increase of pressure, cutting radius increased constantly. When pressure attained one certain value, cutting radius increased a little with the growing of pressure and the variation was smooth. With the increase of diameter of nozzle, cutting radius increased gradually. With the growing of velocity of drill pipes, cutting radius decreased constantly. When the velocity attained one certain value, the reduction was a few and the variation was mild. Prediction model built could accurately predict the variation of cutting radius.