Numerical simulation of solidification phenomena of molten droplet at different impact velocity
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/187226
Tipus de documentText en actes de congrés
Data publicació2017
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Jet engines ingest sand and volcanic ash in the air and then the sand and ash reach a combustion chamber. Due to the high temperature of the chamber, sand and ash are melted and form the molten droplets. The molten droplets are rapidly cooled around the turbine blades and the end walls. The droplets are solidified and finally adhere on these surfaces. This deposition phenomenon causes many problems in the aircraft, e.g., deterioration of the turbine performance, disturbing the cooling flow of turbine blade, etc. To predict or prevent the deposition phenomenon, its mechanisms should be clarified. In the present study, we perform three-dimensional numerical simulations on deposition behavior of a single molten droplet on a cooled substrate. We compare the present numerical data and the experimental data in the previous study for validation and we observe effects of the drop velocity on the deposition phenomenon. As a numerical method, an explicit-moving particle simulation method is employed since the method is suitable for the large interface deformation system. The computational results show reasonable agreements with the experimental data, especially, at an early stage of the deposition. We confirm finger-like-structures which is a characteristic shape of the adhered droplet edge. As increasing of the initial droplet velocity, we found that the increase of the rebound particles.
ISBN978-84-946909-7-6
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