Study on the atomization characteristics of an air-assisted spray dust suppression device
To understand the spray characteristics of the air-assisted spray dust suppression device,a physical model was established based on the JJPW-G100 as the prototype.Using Fluent software,we investigated the spray field shape,range,droplet size,and wind speed of the device.Additionally,we analyzed the effects of the nozzle installation angle and the angle of the air duct on both the spray field range and droplet size.The results indicated that larger diameter droplets from the air-assisted spray dust suppression device were concentrated in the lower part of the spray field,while smaller diameter droplets were predominantly found in the upper part.Additionally,the larger droplets tended to settle near the nozzle outlet.Small droplets are dispersed in the air.As the spray distance increases,the wind speed within the effective range becomes minimal,allowing larger droplets to settle completely.Meanwhile,the concentration of fog droplets outside the effective range is relatively low.The minimum droplet size is independent of the spray range.As the spray range increases,the average droplet diameter first rises,then decreases,and eventually stabilizes.In contrast,the maximum particle size of fog droplets initially increases to a certain value before rapidly decreasing.The nozzle installation angle has a negligible effect on the minimum droplet size;however,both the size of larger droplets and droplet concentration increase as the nozzle installation angle rises.Notably,a 45° nozzle installation angle is identified as the optimal angle for spray dust reduction,resulting in an extended spray range.As the angle of the air duct increases,the height of the spray field also rises,resulting in an increase in both the average and maximum particle sizes of the droplets that fall within the effective range.The air duct can optimize the spray range and dust fall range of the nozzle when set at an angle of 20°.This configuration effectively reduces the rotation phenomenon of the spray field and demonstrates favorable results in practical engineering applications.
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