AUTHOR=Zhang Yu , Yan Yuchao , Yang Ruomiao , Wang Qifan , Zhang Bowen , Gan Qingliang , Liu Zhentao , Fu Jiahong 

TITLE=Study of In-Cylinder Heat Transfer Boundary Conditions for Diesel Engines Under Variable Altitudes Based on the CHT Model

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.828215

DOI=10.3389/fenrg.2022.828215

ISSN=2296-598X

ABSTRACT=The reliability of combustion chamber components is determined by thermal load of
diesel engines. It was found that a great decrement of diesel engine performance and the
ablation area on the surface of cylinder head and piston when vehicles drove from plain to
plateau area, which was largely due to significant increment of prediction error using
Woschni formula at high altitudes. The objective of this study was to propose an improved
model to increase model predicting accuracy at various altitudes. A modified conjugate
heat transfer (CHT) model of combustion chamber and cooling medium was proposed to
analyze the temperature field distribution of cylinder head at different altitudes. The results
indicated that relative errors were controlled within 5% under variant altitudes, comparing
the temperature field of numerical simulation with the single-cylinder engine experiment
test data. Therefore, the in-cylinder heat transfer model can be used to predict the thermal
load of diesel engine combustion chamber components under different altitude operating
conditions.