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Simulation on Liquid Films Impact Atomization Process of Adjacent Pressure Swirl Injectors

WANG Kai;LI Peng-fei;YANG Guo-hua;ZHANG Min-qing;Key Laboratory for Liquid Rocket Engine Technology,Xi'an Aerospace Propulsion Institute;College of Astronautics,Northwestern Polytechnical University;China Academy of Aerospace Liquid Propulsion Technology;  
Based on the numerical simulation method of conical liquid film atomization and breakup process established by Gerris,the atomization process of impact among liquid films formed by adjacent multiple pressure swirl injectors was simulated. The three-dimensional shape and structure characteristics were showed visually and were analyzed in the spray field. Besides,the interaction among the nozzles was discussed,and the spatial distribution of droplets was obtained statistically. The spray characteristics of films impact among the different number of nozzles were also compared. The results show that the films impact between two nozzles forms a fan-shaped region that is similar with the spray field of impinging jets injector,but both are not exactly same.The impact effects of conical liquid films are mainly determined by the radial velocity component of films rather than the tangential velocity component of ones,which also results in that the droplets average diameter almost has nothing to do with the rotation direction of impacting liquid films. The impact of liquid films among the adjacent multiple nozzles would make some remarkable changes to the spatial distribution of droplets,and the breakup length of liquid film is shortened. For the adjacent multiple nozzles,the improvement of atomization characteristics is closely associated with the single nozzle original atomization characteristics and the distance among nozzles. Ultimately,when the geometry structure of nozzles,the distance among nozzles and the position layout of nozzles were given in this article,the droplets SMD of the adjacent double nozzles is more than that of single nozzle,which increased by approximately 4.8%~6.1%. The droplets SMD of the adjacent four nozzles is about7.3% larger than that of the single nozzle,and is about 2.4% larger than that of the double nozzles.
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