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.
self rotating jetnumerical simulationdrill bitpunching and rock breaking
万方数据
维普
