Numerical simulation on deposition phenomena of molten droplet

Abstract

Deposition is a phenomenon where melting particles passing through a combustion chamber are cooled and adhere to the surfaces of a turbine vane and endwalls. Though previous studies have investigated the effect on cooling efficiency after deposition, the deposition mechanism remains unclear. Since it is difficult to carry out the detailed measurement, numerical studies on the deposition mechanism are expected. In the present study, we consider the case where a high-temperature molten droplet impacts on a cold substrate. The temperature change and behavior of a droplet are reproduced, using a MPS-AS method[1]. Furthermore, the deposition phenomena in three cases with different impact speeds and four cases with different substrate temperatures are numerically investigated. We numerically investigate the deposition mechanism on the cooled substrate and describe in detail how the solidification process varies with the impact velocity and the temperature changes.