Abstact The atomization and combustion characteristics of fuels injected in aviation gas turbine engines are very important in the research and development of gas turbine combustors and have a significant impact on engine efficiency and pollutant emissions. In this study, spray atomization characteristics of pre-filming airblast nozzles developed for use in aviation gas turbine combustors were experimentally investigated for different air to liquid ratios (ALR) and air pressure differences (ΔP (%)). Pure water and Jet A-1, which have different viscosities and surface tensions that greatly affect the atomization characteristics, were used as the working fluid. Spray atomization characteristics were investigated by simultaneous measurement of droplet sizes and velocities using PDA (phase Doppler anemometry) and spray visualization using a CCD camera coupled with a Nd:YAG laser as a light source. The atomization characteristics of water and Jet A-1 showed significant differences in spray angle, velocity distribution and mean droplet size. Jet A-1 spray with lower surface tension showed a smaller mean drop size (WMSMD) than water spray did. As the ALR increased, the mean droplet size of the two liquids decreased. From the analysis of the spray flow characteristics, the surface tension associated with aerodynamic instability was the dominant variable in the atomization process with liquid sheet disintegration. The experimental constants included in the previously proposed empirical formulas for predicting the mean droplet size of the pre-filming airblast nozzle spray were presented for the two liquids used in the experiment.

中文翻译：

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液体和ALR物理性质对预成膜喷气喷嘴喷雾特性的影响

摘要 航空燃气涡轮发动机喷射燃料的雾化和燃烧特性在燃气涡轮燃烧室的研发中非常重要，对发动机效率和污染物排放有显着影响。在本研究中，针对不同的气液比 (ALR) 和气压差 (ΔP (%))，对开发用于航空燃气轮机燃烧器的预成膜鼓风喷嘴的喷雾雾化特性进行了实验研究。纯水和 Jet A-1 具有不同的粘度和表面张力，极大地影响雾化特性，被用作工作流体。通过使用 PDA（相位多普勒测速仪）同时测量液滴尺寸和速度，并使用 CCD 相机与 Nd:YAG 激光器作为光源进行喷雾可视化来研究喷雾雾化特性。水和Jet A-1的雾化特性在喷雾角度、速度分布和平均液滴尺寸方面表现出显着差异。具有较低表面张力的 Jet A-1 喷雾显示出比水喷雾更小的平均液滴尺寸 (WMSMD)。随着 ALR 的增加，两种液体的平均液滴尺寸减小。从喷雾流动特性的分析来看，与空气动力学不稳定性相关的表面张力是液片分解雾化过程中的主要变量。