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Lookup NU author(s): Dr Yiji LuORCiD, Professor Tony Roskilly
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Pergamon Press, 2019.
For re-use rights please refer to the publisher's terms and conditions.
© 2018 Elsevier Ltd The demand of increasing power density of the Internal Combustion Engine promotes the technology development using internal cooling gallery of the piston. The oil flow and heat transfer performance of the piston internal cooling gallery have great influence on the cooling performance, which affects the thermal conditions of the piston and of the entire engine. The experimental study using visualising method is therefore critical and important to observe the flow patterns inside the piston gallery. In this paper, we presented the visualised study of two-phase flow patterns within an open cooling gallery by using a high-speed camera at various crank angles. The effects of motor speed both on the flow patterns and temperature distribution were investigated and the heat transfer mechanisms in gas-liquid two-phase flow during reciprocating motion were explored. Based on the study, the period-doubling phenomenon, which represented the transition from laminar flow to turbulent flow, was observed when the speed was around 400–500 rpm. Results indicated the increase of motor speed can effectively improve the cooling performance. Results also showed when the speed was higher than 600 rpm, the reduction of temperatures was quite close, which proven the existence of optimal or minimum requirement of motor speed to achieve good quality cooling performance. The results obtained in this study could be used as a critical reference for numerical studies and important experimental reference to further investigate the design and optimisation of engine cooling gallery for vehicle application.
Author(s): Yu X, Yi D, Huang Y, Lu Y, Paul Roskilly A
Publication type: Article
Publication status: Published
Journal: International Journal of Heat and Mass Transfer
Year: 2019
Volume: 132
Pages: 1306-1318
Print publication date: 01/04/2019
Online publication date: 11/01/2019
Acceptance date: 12/12/2018
Date deposited: 27/02/2019
ISSN (print): 0017-9310
ISSN (electronic): 1879-2189
Publisher: Pergamon Press
URL: https://doi.org/10.1016/j.ijheatmasstransfer.2018.12.089
DOI: 10.1016/j.ijheatmasstransfer.2018.12.089
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