A 60 L combustion bomb was used to study the influence of coal dust concentration on the explosion flow field of dusty methane in tank-shaped space.Four pressure sensors were arranged and located on the upper,lower,left and right of a section of the bomb,which were named PU,PL,PD and PR,respectively.According the explosion pressure and the flame image captured by the laser schlieren system,the variation tendency of the explosion pressure and flame structure were analyzed.A total of 6 sets of working conditions were designed in the test.The methane-air premixed gas with a concentration of 9.5% was selected for the test.The coal dust with various concentration(0 g/m3,5 g/m3,10 g/m3,15 g/m3,20 g/m3 and 25 g/m3) was added to the gas for the test.In case of methane explosion,the variation of explosion pressure can be divided into four stages,pressure rise stage,pressure decrease stage,secondary rise stage and continuous decline stage.The peak pressure of PU sensor is the largest and the rise rate of the pressure is the fastest.When the oxygen concentration keeps constant,the peak pressure of dusty methane explosion presents the reverse-V type variation tendency with the increase of coal dust concentration.When the coal dust concentration is 15 g/m3,the maximum explosion pressure is 598.697 kPa.The evolution process of explosion flame structure can be divided into three stages,laminar flow stage,cellular instability stage and turbulent flow stage.The disturbance in the flow field leads to the folds of the flame front and the increase of the coal dust concentration,which increases the influence of coal dust particles on the flame disturbance and accelerates the evolution process of the flame structure.