Experimental Research On Atomization Mechanism And Dust Reduction Of Supersonic Spiral Atomizer

In view of the serious problem of dust pollution in coal mines and to prevent the harm of dust,especially respiratory dust,to workers,a new method of supersonic spiral atomization for dust reduction is proposed according to the principle of supersonic atomization and the law of vortex airflow generation.Using the methods of theoretical analysis,numerical simulation and experimental research,the spiral atomization mechanism,spray atomization performance and dust reduction comparative test research were carried out,which provided new ideas for spray dust reduction technology.Based on the K-H droplet breakup model and the turbulent k-ε model,using the CFD fluid mechanics method in the COMSOL software,by simulating the velocity vector distribution of the air flow field inside the aerodynamic screw device under different parameters,and the droplet group is released from the nozzle with time changes in the external According to the movement law in the air column,the structure parameters of the pneumatic screw device and the particle size distribution of the droplets when the coupled wind flow screw effect is the best are obtained.Set up a test platform for the best pressure ratio of the main and side air paths,and study the spray spiral effect and atomization angle changes under different main and side pressure ratios by controlling a single variable method,and determine the main and side air path pressures when the spray spiral effect is the best ratio and optimum air supply pressure.By studying the effect of supersonic spiral atomization under different parameters of aerodynamic spiral device,it is verified that when the structural parameters of pneumatic spiral device are α=30° and d=1.25,the spiral atomization effect is the best.Set up a test platform for spray atomization performance parameters,and carry out the measurement of atomization performance parameters such as spray range,atomization angle,and water consumption under different working conditions of high-pressure nozzles,ultrasonic atomization nozzles and supersonic spiral atomization generators,and obtained three types of fog.The changing law of atomization performance parameters with the change of atomization pressure under different atomization modes is determined,and the working conditions when atomization performance is optimal under different atomization modes are determined.Set up an experimental platform for dust suppression of supersonic spiral atomization generators,and carry out research on the dust removal efficiency of high-pressure atomizing nozzles,ultrasonic atomizing nozzles and supersonic spiral atomizing generators under the best working conditions.The concentration changes of dust and breathing dust were compared,and the barrier conditions of total dust and breathing dust under the three atomization methods were compared and analyzed.Finally,the dust and mist coupling of the dust box after the dust reduction was observed,and the dust reduction efficiency of the supersonic spiral atomizer was verified.This paper has 50 pictures,15 tables and 78 references.