Effect of structural parameters on atomization characteristics and dust reduction performance of swirl nozzle

In order to solve the serious problem of dust pollution in coal mine, we used theoretical analysis, numerical simulation, and experimental measurement to study the influence of nozzle structure on dust removal effects. First, we constructed a VOF to DPM model which can accurately simulate the atomization process inside and outside the nozzle spray field. We analyzed the influence of a nozzle's internal structure. We determined that the optimal internal structure parameters of the nozzle were as follows. The water passage area of the swirl core Sl = 4.5 mm2, the swirl core through the water passage baffle is optimized for flat mouth, and the swirl core angle alpha l = 70 degrees. We used 3D printing technology to create this novel optimized nozzle and analyzed it experimentally. The data showed that when the spray pressure was 6 MPa, the dust removal rate when using the new nozzle was 87.4 %, thus the spray dust removal effect had been improved.