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The present research investigates the impingement between spray droplets and two different coating walls is investigated to analyse effects of impingement on the mixing characteristics of propellants. In a mechanism experiment, a droplet with variable Weber number impinging on the coating walls at different wall temperatures is observed to have different behaviors, including spread, breakup, splash, suspension and rebound. Through this experiment, we establish a mathematical impinging model of these two coatings, which are identified by wall temperature and incident Weber number. These models are taken into the simulation to describe the mixing characteristics of two propellants under thermal atmosphere. The results indicate a significant difference in the mixing situation for two coatings impingement, showing a good agreement with experimental results of firing tests. Compared with SiCrTiZr coating, MoSi2 coating significantly benefits better mixing to improve combustion efficiency with lower temperature simultaneously, because more droplets get into impingement regimes of rebound and participate into central combustion. Therefore, oxygen-rich combustion area is centralized away from chamber wall, which is conducive to survival of liquid cooling film.

Computational Simulation Study on the Influence of Spray/Wall Impact on the Mixing Characteristics of Bipropellant Centrifugal Apogee Engine