In order to solve the problem of low efficiency in coal bed methane mining,a self rotating jet drill for coal bed methane mining is designed in this paper.The bit based on self rotating jet is simulated by the combination of Fluent numerical simulation and test.The simulation results show that the center jet has a maximum velocity,while the middle and edge jet velocities are small,but have a spatial angle;then,bycomparing andanalyzing the characteristics of erosionand rock fragmentation of three types of jet bits,it is found that this type of jet bit has a better ability of punching and rock fragmentation than straight rotating mixed and cavitating jet bits.The research shows that the self rotating jet drill has a good ability to erode and break coal and rock.
关键词
自旋转射流/数值模拟/钻头/冲孔破岩
Key words
self rotating jet/numerical simulation/drill bit/punching and rock breaking
维普
万方数据