In the last years, a growing interest about increasing the engine efficiency has led to the development of new
engine technologies. The accurate determination of the heat transfer across the combustion chamber walls is highly
relevant to perform a valid thermal balance while evaluating the potential of new engine concepts. Several works
dealing with heat transfer correlations that consider the swirl motion are found in the literature; however, there is a
lack of works dealing with heat transfer correlations which take into account the effect of the tumble movement. In
this work, a new heat transfer model accounting for the tumble motion is presented. A two stroke HSDI Diesel engine
with high tumble and no swirl is used to perform the theoretical study, the model development and its final calibration.
Initially, a theoretical analysis of the gas movement phenomena is carried out based on CFD results and then, a model
is developed and calibrated based on a skip-fire testing technique. Finally, a sensitivity study focused on evaluating the
model robustness is performed. The results confirm an average RMSE reduction of 70% with respect to the Woschni
model, being this consistent improvement qualitatively evidenced in the instantaneous heat transfer evolutionThe support of the Spanish Ministry of Economy and Competitiveness (TRA2013-41348-R) is greatly acknowledged.Olmeda González, PC.; Martín Díaz, J.; Novella Rosa, R.; Carreño, R. (2015). An adapted heat transfer model for engines with tumble motion. Applied Energy. 158:190-202. https://doi.org/10.1016/j.apenergy.2015.08.051S19020215
