Numerical investigation of buoyancy-driven heat transfer within engine bay environment during.pdf (1.94 MB)
Download file

Numerical investigation of buoyancy-driven heat transfer within engine bay environment during thermal soak

Download (1.94 MB)
journal contribution
posted on 18.10.2019, 10:47 by Ruoyang Yuan, Sureshkumar Sivasankaran, Nilabza Dutta, Wilko Jansen, Kambiz EbrahimiKambiz Ebrahimi
This paper investigates transient heat transfer processes of a vehicle under-bonnet region during natural soak condition using computer aided engineering (CAE). Heat reserved within the engine bay is beneficial to the engine cold-start for potentially reductions in friction losses, CO2 emissions and fuel consumption. Buoyancy-driven convection, thermal radiation and conduction are key contributors to heat transfer processes of engine compartments during soak. In this study, a coupled transient 3D computational fluids dynamics (CFD) – heat transfer modelling method was studied in a passenger vehicle to simulate its 9 hours cool-down behaviours. The developed CAE method was able to predict the temperature cool-down of the key fluids of good agreement with experiments. Potential air and heat leakage paths around the engine bay were identified. The flow development during the early stage (0-2 hrs) of the soak was vital to accurate prediction of the heat transfer coefficients for the heat retention modelling, where convection and radiation have played important parts. Optimum simulation strategy was obtained with reduced simulation time and good prediction accuracy. This further allows the integration of engine encapsulation design for optimising fuel consumption and emissions in a timely and robust manner, aiding the development of low-carbon transport technologies.

Funding

Innovate UK and the Advanced Propulsion Centre (APC)

History

School

  • Mechanical, Electrical and Manufacturing Engineering
  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Applied Thermal Engineering

Volume

164

Publisher

Elsevier Ltd.

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier Ltd.

Publisher statement

This paper was accepted for publication in the journal Applied Thermal Engineering and the definitive published version is available at https://doi.org/10.1016/j.applthermaleng.2019.114525.

Acceptance date

10/10/2019

Publication date

2019-10-14

Copyright date

2020

ISSN

1359-4311

Language

en

Depositor

Prof Kambiz Ebrahimi. Deposit date: 17 October 2019

Article number

114525