Numerical Simulation on Atomization Characteristics of Lining Micro Oscillation Cavity Nozzle Based on CFD

In order to study the influence of nozzle’s internal structure on dust suppression by spraying in coal mine, using Fluent software, the internal flow fields of micro-oscillating cavity nozzles with different structures were simulated by grid independence test and SIMPLEC algorithm. The simulated results show that the structure of the micro-oscillating chamber on the inner wall of the nozzle has a great influence on the outlet speed, when the inlet pressure is 8 MPa, it presents the maximum speed difference between the two nozzles; moreover, both nozzles are gradually increasing along the axial direction, resulting in maximum velocity in the throat section; the stepped inner wall micro oscillation chamber nozzle can further increase the nozzle outlet speed as compared with the regular inner micro oscillation chamber nozzle; in the lining micro oscillation cavity nozzle, the atomization is generated inside the micro-oscillating chamber and the cavity opening, furthermore, it will produce varying degrees of eddy currents in the micro-oscillating cavity.