气体喷射及环境背压对空气辅助喷雾特性影响研究

为了解不同气体参数及环境背压对空气辅助喷雾特性的影响,通过定容弹试验平台,采用高速摄影技术分析不同喷气脉宽、不同喷气压力、不同环境背压对于空气辅助喷雾特性的影响,尤其是喷雾宏观形态的变化,并对贯穿距、喷雾投影面积等喷雾特性参数进行定性分析.试验结果表明,在不同试验条件下贯穿距均呈两阶段发展趋势,喷雾投影面积线性增长.增...

The influence of gas jet and ambient pressure on the characteristics of air-assisted spray

In order to research the influence of different gas parameters and ambient pressure on air-assisted spray. In this study, spray characteristics was investigated under various air duration, air pressure and ambient pressure in a constant volume vessel by high-speed photography, with specifically interest in macroscopic spray characteristics. Penetration and spray area was used to quantitative analysis spray characteristics. Under different test conditions the results show that two-stage development of air-assisted spray penetration is observed and the spray area exhibit linear increase. Increase air pressure or decrease ambient pressure is beneficial to enhance the spray penetration and spray area, while air duration has little influence on penetration and spray area. The spray shape of different air pressure and air duration were almost the same, with only slight difference. However spray shape is greatly affected by ambient pressure, at low ambient pressure, the spray shape is a "spindle" shaped, while at high ambient pressure, it presents an "anchor hook" shape and a "cone" shape. With the increase of ambient pressure, the thin region of spray began to decrease gradually and disappeared, under high ambient pressure the spray is mainly the core region.