| An atomizing nozzle is designed based on Laval tube, which makes the natural gas flow at supersonic speed, shears and breaks the liquid flow into small droplets, and reduces the cross-sectional density and flow resistance of the gas and liquid phases. The microscopic shape and internal flow field law of gas-liquid flow inside the nozzle are simulated with Fluent numerical simulation software. The influence of gas phase pressure, liquid flow velocity, orifice diameter and number of liquid orifices on atomized particle distribution law and atomization effect is analyzed. The research shows that the liquid jet depth is 0.911 2 mm and the scattering width is 1.201 3 mm under the gas phase pressure of 303 975 Pa, the atomization effect is better. When the gas phase pressure is increased to 1 013 250 Pa, the atomized particles are close to the wall, the jet depth is 0.304 1 mm, the scattering width is 0.365 0 mm, and the atomization effect is deteriorated. When the liquid flow velocity is increased, the atomization effect is enhanced; the orifice diameter is increased, the spray depth increases. When the orifice diameter is 1.2 mm, the scattering width has a maximum value of 2.356 2 mm, and the atomization effect is the best. The double orifice structure is used, the atomized particle diameter distribution is uniform and close to normal distribution, the atomized particle diameter is reduced, and the atomization effect is enhanced. By changing the working condition parameters, the liquid carrying rate and drainage quality can be improved. |
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