Numerical investigation of buoyancy-driven heat transfer within engine bay environment during.pdf (1.94 MB)
Numerical investigation of buoyancy-driven heat transfer within engine bay environment during thermal soak
journal contribution
posted on 2019-10-18, 10:47 authored by Ruoyang Yuan, Sureshkumar Sivasankaran, Nilabza Dutta, Wilko Jansen, Kambiz EbrahimiKambiz EbrahimiThis 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 EngineeringVolume
164Publisher
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
2019-10-10Publication date
2019-10-14Copyright date
2020ISSN
1359-4311Publisher version
Language
- en