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为改善双股射流碰撞雾化器的雾化性能,基于自行搭建的射流碰撞雾化实验台,采用CCD拍摄技术,研究射流速度、碰撞角度、喷嘴出口内径和黏度对雾化特征的影响.结果表明:随着射流韦伯数和碰撞角度的增大,喷雾角增大,液滴的索太尔平均直径(SMD)减小,且液滴分布更加均匀;喷嘴内径较小时形成的液膜厚度较薄,稳定性差,喷雾角较小,在所研究的范围内,液滴的平均直径不受喷嘴内径的影响;液体黏度越大,液膜越稳定不易破碎,液膜尺寸越大,喷雾角越小,液滴的平均粒径越大;在韦伯数较小时,差异明显,而在较高的韦伯数条件下,差距较小.在进行40%浓度甘油溶液雾化实验时,观察到了液膜翻转现象,从碰撞点往下出现连续多个相互垂直的液膜.因此,增大射流速度、碰撞角度,减小液体黏度,有助于改善雾化性能.
In order to improve the atomization performance of double-jet collision nebulizer, the effects of jet velocity, collision angle, inner diameter of nozzle exit and viscosity on atomization characteristics were studied by using CCD shooting technology based on self-built jet collision atomization test bench.Results It shows that with the increase of the Weber number and the collision angle, the spray angle increases and the SMD of the droplets decreases and the droplet distribution becomes more uniform. The thickness of the liquid film formed when the nozzle inner diameter is smaller Thin, poor stability, smaller spray angle, within the scope of the study, the average diameter of droplets from the nozzle diameter; the greater the liquid viscosity, the more stable liquid film is not broken, the greater the size of the liquid film, the spray angle The smaller the average size of the droplet, the smaller the number of Weber, the difference is obvious, but in the case of the higher Weber number, the difference is small.40% concentration glycerol solution atomization experiment, the observed liquid film Flip phenomenon, the collision point down from the emergence of a number of perpendicular to each other liquid film.Therefore, increasing the jet speed, collision angle, reduce the viscosity of the liquid, help to improve the atomization performance.