Abstract A twin-fluid nozzle was proposed for low-pressure atomization. The nozzle is featured by swirling air flows in the mixing chamber. Liquid medium is thereby inhaled due to the pressure difference. An experimental work was performed to investigate the atomization performance of the nozzle and the hydrogen peroxide solution served as the liquid medium. Droplet size and droplet velocity were measured. Effects of the diameter of the air-injection orifice and the air-injection pressure were investigated. The results show that small droplet size is achieved with the proposed nozzle. As the spray develops, Sauter mean diameter (SMD) of the droplets decreases first and then increases, irrespective of the variation of the air-injection orifice diameter and the air-injection pressure. Overall SMD varies inversely with the air-injection orifice diameter and air-injection pressure. Near the nozzle, cross-sectional velocity distribution exhibits a peak-valley pattern, which is replaced with uniformized velocity distributions away from the nozzle. Similarity of cross-sectional radial velocity distribution at different air pressures is evidenced. Furthermore, the correlation between droplet size and droplet velocity is established.

中文翻译：

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具有内旋和自吸效应的双流体喷嘴的流动和雾化特性

摘要 提出了一种低压雾化双流体喷嘴。喷嘴的特点是混合室中的涡流气流。由于压力差，液体介质由此被吸入。进行了实验工作以研究喷嘴的雾化性能，并以双氧水作为液体介质。测量液滴尺寸和液滴速度。研究了空气喷射孔的直径和空气喷射压力的影响。结果表明，使用所提出的喷嘴实现了小液滴尺寸。随着喷雾的发展，液滴的 Sauter 平均直径 (SMD) 先减小后增大，而与空气喷射孔直径和空气喷射压力的变化无关。总体 SMD 与空气喷射孔口直径和空气喷射压力成反比变化。在喷嘴附近，横截面速度分布呈现峰谷模式，取而代之的是远离喷嘴的均匀速度分布。证明了在不同气压下横截面径向速度分布的相似性。此外，建立了液滴尺寸和液滴速度之间的相关性。