Liquid fuel atomization plays an important role in fuel combustion of gas turbine engines and internal combustion engines. To reveal the interaction of atomizing air temperature (AAT) and air-liquid mass ratio (ALR) during the air-blast atomization process, n-heptane atomization in an air-blast atomizer is carried out experimentally at AAT = 300 K−450 K and ALR = 0.9−2.9. The spray cone angle (φ) presents a three-stage featured with rising ALR and enters the stable stage of 25°−26°. ALR played a decisive role in droplet size and velocity, while the AAT effect is ancillary and has a notable performance at part of conditions. The AAT effect on droplet size is more obvious at low ALR, while the effect on droplet velocity is strengthened as ALR increases. The same conclusion is also obtained in the analyses of droplets kinetic energy and surface energy. This discovery inspires us to increase AAT to compensate for the atomization performance decrease caused by reducing ALR. It can reduce the air pump load while stabilizing the atomization performance for large air mass flow condition. Even at low liquid mass, increasing AAT yields a visible improvement.

中文翻译：

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微型鼓风雾化器中加热空气雾化正庚烷的喷雾特性和能量分析

液体燃料雾化在燃气涡轮发动机和内燃机的燃料燃烧中起着重要作用。为了揭示鼓风雾化过程中雾化空气温度 (AAT) 和气液质量比 (ALR) 的相互作用，n-在 AAT = 300 K−450 K 和 ALR = 0.9−2.9 下实验性地进行鼓风雾化器中的庚烷雾化。喷雾锥角(φ)呈现ALR上升的三阶段，进入25°−26°的稳定阶段。ALR对液滴大小和速度起决定性作用，而AAT效应是辅助作用，在部分条件下表现显着。AAT 对液滴尺寸的影响在低 ALR 时更明显，而对液滴速度的影响随着 ALR 的增加而增强。在液滴动能和表面能的分析中也得到了相同的结论。这一发现启发我们提高 AAT 以补偿因降低 ALR 而导致的雾化性能下降。可在稳定雾化性能的同时，降低气泵负荷，适用于大空气流量工况。