Influence of pipe shape on dust reduction characteristics of supersonic atomization
In order to deal with the pollution problem of underground dust in the coal mining industry,a supersonic atomiza-tion dust reduction technology was proposed based on the theory of supersonic flow in compressible airflow pipes.By using the numerical simulation method,the influence of different structures and aerodynamic total pressures on the supersonic flow process inside the Laval nozzle was studied,and the supersonic flow law of different Laval nozzle structural parameters under different aerodynamic total pressures was analyzed through the phenomena such as shock waves,sonic rings,and the maximum Mach number in the axial direction,as well as the maximum average velocity along the axis.An experimental platform of atom-ization characteristics was established,then the dust reduction efficiency of the best nozzle shape under different pressures was calculated and compared,and the variation law of dust reduction efficiency at different times and different pressures was ana-lyzed.The results show that the concave nozzle has the strongest dust reduction stability under different pressures,and it is the best choice for making the atomization dust reduction nozzles.The instantaneous dust reduction efficiency of the concave noz-zle at three times under different pressures gradually increases with time,and the atomization dust reduction effect is good.When the spray time is 3 min and the pneumatic pressure is 0.5 MPa,the dust reduction efficiency of the concave nozzle is 85.13％.At this time,the concave nozzle has the highest dust reduction efficiency and the best dust reduction effect.The re-search results can provide theoretical support and control means for the dust problem in the process of underground coal min-ing.
万方数据
维普
