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方传宇, 王凯兴, 刘舆帅, 王少林, 刘富强, 杨金虎, 曹程, 刘存喜, 穆勇, 徐纲, 朱俊强. 离心喷嘴液膜形态与液膜破碎机制试验研究. 力学学报, 待出版. DOI: 10.6052/0459-1879-24-062
引用本文: 方传宇, 王凯兴, 刘舆帅, 王少林, 刘富强, 杨金虎, 曹程, 刘存喜, 穆勇, 徐纲, 朱俊强. 离心喷嘴液膜形态与液膜破碎机制试验研究. 力学学报, 待出版. DOI: 10.6052/0459-1879-24-062
Fang Chuanyu, Wang Kaixing, Liu Yushuai, Wang Shaolin, Liu Fuqiang, Yang Jinhu, Cao Cheng, Liu Cunxi, Mu Yong, Xu Gang, Zhu Junqiang. Experimental study on liquid film and breakup mechanism of pressure swirl atomization. Chinese Journal of Theoretical and Applied Mechanics, in press. DOI: 10.6052/0459-1879-24-062
Citation: Fang Chuanyu, Wang Kaixing, Liu Yushuai, Wang Shaolin, Liu Fuqiang, Yang Jinhu, Cao Cheng, Liu Cunxi, Mu Yong, Xu Gang, Zhu Junqiang. Experimental study on liquid film and breakup mechanism of pressure swirl atomization. Chinese Journal of Theoretical and Applied Mechanics, in press. DOI: 10.6052/0459-1879-24-062

离心喷嘴液膜形态与液膜破碎机制试验研究

EXPERIMENTAL STUDY ON LIQUID FILM AND BREAKUP MECHANISM OF PRESSURE SWIRL ATOMIZATION

  • 摘要: 离心喷嘴由于其具有简单可靠的结构以及优异的雾化性能, 被广泛应用于航空发动机燃烧室喷嘴. 离心喷嘴的性能一定程度上决定了燃烧室的燃烧稳定性能, 燃烧组织性能和排放特性. 文章采用高速阴影成像技术和相位多普勒粒子测速仪(PDPA)对比研究了喷注压力对于离心喷嘴流量系数、喷雾锥角、液膜形态、破碎模式以及粒径分布的影响, 系统分析离心喷嘴液膜形态、液膜破碎机制和雾化特性, 并使用本征正交分解(POD)方法识别出不同液膜形态下的主要和次要的破碎模式, 建立了离心喷嘴液膜形态与雾化特性之间的对应关系, 支撑了离心喷嘴雾化性能优化研究. 结果发现, 随着喷注压力的增大, 流量系数和喷雾锥角呈现出先增大后减小的趋势; 喷注压力通过改变液膜的液体韦伯数(We)从而改变液膜形态. 随着We的增加, 液膜的破碎位置逐渐向喷嘴出口处移动, 破碎距离逐渐减小, 并使得离心喷嘴下游液滴的径向速度增大, 大粒径液滴向两侧运动, 导致雾锥中心的索太尔平均直径(SMD)迅速下降; 离心喷嘴不同的液膜形态包含多种液膜破碎模式, 并随着We数增加而演化: 随着We数的增加, 液膜的主要破碎模式依次为撞击破碎、表面波破碎、穿孔破碎以及湍流破碎, 且这4种破碎模式的表面波频率依次增大.

     

    Abstract: Pressure swirl atomizers are widely used in aircraft engine combustion chamber to their simple and reliable structure as well as excellent atomization performance. The atomization characteristic of pressure swirl atomizers influences the combustion stability, combustion efficiency, and emission characteristics. This study systematically analyzed the liquid film, breakup mechanism, and atomization characteristics of pressure swirl atomizers. The goal was to establish a correlation between the morphology of the liquid film and atomization characteristics, thereby supporting the optimization of pressure swirl atomizers' performance. Phase-Doppler Particle Analyzer (PDPA) and high-speed shadowgraph were employed to investigate the impact of fuel injection pressure on parameters such as discharge coefficient, spray angle, liquid film breakup mechanism, and droplet size distribution. Additionally, the Proper Orthogonal Decomposition (POD) method was utilized to identify primary and secondary breakup modes for different liquid films. The result shows that with injection pressure increased, the discharge coefficient and spray cone angle exhibited a trend of initially increasing and then decreasing. The fuel injection pressure alerts the liquid film by changing the liquid Weber number ( We ). With the We increased, the breakup length of the liquid film gradually decreased, and the droplet radial velocity increased. This caused the larger droplets to move towards the sides, resulting in a rapid decreased in the Sauter mean diameter (SMD) at the center of the spray cone. The liquid film breakup processes were composed of a variety of modes. With the We increased, the primary modes are varied from the impact breakup to wavy breakup and perforation breakup as well as turbulent breakup and the surface wave frequencies of these four breakup modes increased in succession.

     

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