Experimental and numerical simulation study on the effect of ignition delay time on dust explosion in the 1 m3 vessel

Abstract

Through experiments and numerical simulation methods, the parameters of each flow field and their effects on dust explosion intensity under different ignition delay time in a 1 m3 explosion vessel were quantitatively studied. The results showed that the explosion pressure and pressure rise rate of corn starch first increased and then decreased with increasing ignition delay time, and the maximum value were obtained when the ignition delay time is about 600 ms, which were 0.884 MPa and 17.9 MPa/s, respectively. The comparison between the numerical simulation and experiment proves the accuracy of simulation calculation. Furthermore, the turbulent distribution of airflow and particles before ignition was quantitatively studied. The particle distribution is gradually uniform after 300 ms, and the turbulent kinetic energy is in a low range. The root mean square velocity and average turbulent kinetic energy of the airflow are 3 m/s and 3.5 m2/s2 at 600 ms.