Abstract The rebound and adhesion characteristics of high-temperature alumina droplets upon collision with walls at varied temperatures, are pivotal for the accurate calculation of slag deposition and two-phase flow in solid rocket motors. This study employs an experimental system for high-temperature alumina droplet-wall collisions to gain insights into collision characteristics. The study procures rebound/adhesion regime maps for alumina droplet-wall collisions at different wall temperatures, which suggests that droplets with larger (normal Reynolds number) propensity towards adhesion under the same Ohnesorge number. Further observations include the expansion of the rebound region as the wall temperature incrementally rose from 25 °C to 1000 °C. In view of these, an energy predictive model considering the heat conduction between the droplet and the wall is developed. This model aims to predict the rebound/adhesion of high-temperature alumina droplets colliding with walls at different temperatures. The predictive model's results are then fit to obtain a rapid predictive formula suitable for quick prediction. Both the energy predictive model and the rapid predictive formula undergo verification via 40 validation experiments, consequentially achieving a prediction accuracy of 95.0 %.
Highlights Collision result regime maps under walls of 25∼1000 °C are obtained. A rapid predictive formula suitable for quick prediction is obtained. Collision result predictive model is established with a prediction accuracy of 95 %.
Experiment and model study of rebound/adhesion characteristics of alumina droplets colliding with walls at different temperatures
Acta Astronautica ; 217 ; 246-254
2024-01-20
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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