The Experimental Observation of the Interactions between Sprays

• Main Authors: Li-PingLi, 李麗平
• Other Authors: Hsiao-Feng Yuan
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/95211931741529572759

碩士 === 國立成功大學 === 航空太空工程學系 === 102 === Impinging type injector has been commonly adopted in liquid rocket injector plate design because it simultaneous atomizes and mixes propellants adequately. Conventionally, the arrangement of impinging injectors on injector plate considers the geometry uniformity and manufacture convenience, the interactions between sprays were hardly an issue to be considered in design. In practical, experimental result reveals that the interactions between sprays do occur. This thesis research utilized a pair of identical impinging sprays, by changing their distance, experimental observations and analyses have been performed to characterize the interactions between sprays. This research utilized PLIF (Planar Laser-Induced Fluorescence) technique, Malvern droplet analyzer, and PIV (Particle Image Velocimetry) for spray analysis. The results show that the mass distribution becomes wider and more uniform, and mean droplet size distribution gets smaller when two fully developed sprays are in direct contact. By calculating the Weber number between droplets in the interaction zone, it shows that the outcome of droplet collisions, although low in probability, is mainly in stretching separation, which cannot explain the experimental observations. The major interaction between sprays is justified to be the sucking effect of the airflow driven by droplet motion in individual spray.