@Article{icces.2021.08478,
AUTHOR = {Makoto Yamamoto},
TITLE = {Multi-physics CFD Simulation in a Jet Engine},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {23},
YEAR = {2021},
NUMBER = {1},
PAGES = {19--19},
URL = {http://www.techscience.com/icces/v23n1/42043},
ISSN = {1933-2815},
ABSTRACT = {In a turbine of a jet engine, deposition phenomenon is often observed.
Deposition is a phenomenon that particles such as volcanic ash, sand and dust 
passing through a combustion chamber of a jet engine are melt, rapidly cooled 
and then accumulate on the turbine blade and end-wall surfaces. Deposition is 
one of critical problems when aircraft flies in a cloud with many particles. 
Obviously, deposition can degrade the aerodynamic performance of the turbine 
blade and vane, and make partial or complete blockage of film-cooling holes. As 
the result, deposition deteriorates safety and life time of the turbine. In the past
investigations, a lot of researches have focused on the effect of deposition on 
aerodynamic performance and cooling efficiency. The dependency of deposition
on wall temperature was also investigated. However, the deposition mechanism 
itself remains unclear, especially at high temperature condition in a jet engine. 
This is because it is too difficult to conduct the detailed measurements due to the 
small size of particles and the high temperature in a turbine. Additionally, as it 
can be expected that deposition is a typical multi-physics phenomenon, the 
physics is very complex. Therefore, a reliable deposition model has not been 
established and validated yet. If the mechanism could be clarified, it is possible 
to develop a good deposition model and realize more accurate predictions of 
deposition phenomenon in a jet engine. Considering these backgrounds, in the 
present presentation, I will explain our computational researches on deposition 
phenomenon in a jet engine. First, a numerical method to predict deposition 
phenomenon in a jet engine is proposed, based on the grid-based method and 
multi-physics modeling. Some existing deposition models which were 
empirically derived are validated to a canonical condition, and then the best 
model is applied to a turbine vane. Through this study, the characteristics of 
deposition on the turbine vane is clarified. Second, in order to clarify the 
deposition mechanism, solidification of a high temperature droplet is reproduced, 
using the particle-based method. Based on the numerical results, the detail of 
solidification process is investigated.},
DOI = {10.32604/icces.2021.08478}
}