When an aluminum droplet impacts a solid wall in a solid rocket motor, its rebound changes the droplets’ motion parameters, making it difficult to precisely predict the internal flowfield parameters as well as the performance of the motor. In this paper, the rebound process of aluminum droplet/wall impact is investigated experimentally, and a semi-empirical model for the rebound motion calculation is established. The results show that as the normal incident velocity increases from 0.63 to , the normal rebound coefficient decreases from 0.81 to 0.49. At the same time, as the incident angle increases from 0 to 50°, the normal rebound coefficient increases from 0.6 to 0.8. The tangential rebound coefficient is maintained in the range of 0.74–0.92 under different experiment conditions, because it is mainly affected by the surface roughness of the solid surface and the contact angle between the droplet and the wall. We also find that, with an increase in Weber number, the rebound coefficient first decreases and then remains stable under larger Weber numbers.
Experimental and Modeling Investigation on the Rebound Process of Aluminum Droplet/Wall Impact
Journal of Propulsion and Power ; 38 , 4 ; 599-606
2022-02-22
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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