Numerical analysis of heat transfer in heat insulated diesel engines |
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| Institution: | 1. Spectral Energies, LLC, 5100 Springfield St., Suite 301, Dayton, OH 45431, USA;2. Air Force Research Laboratory, Wright-Patterson Air Force Base, OH, USA;1. Laboratory of Electronics, Instrumentation, and Energetic, Faculty of Sciences, B.P 20. 24000 El Jadida, Morocco.;2. Industrial Engineering Laboratory, Faculty of Science and Technology, BP: 523,Beni Mellal, Morocco;1. Shanghai JiaoTong University, School of Mechanical Engineering, Shanghai, China;2. Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7190 Institut Jean le Rond d’Alembert, F-75005 Paris, France;3. LAMIH CNRS UMR 8201, UVHC, F-59313 Valenciennes, France |
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| Abstract: | The diesel combustion process has been simulated by an axisymmetric CFD computation for analyzing the wall heat transfer at elevated wall temperatures in heat insulated diesel engines and at conventional wall temperatures in normally cooled ones. A new model has been introduced in the computation to describe the reactive thermal boundary layers. The results show that in most cases tested the wall heat fluxes are lower at an elevated wall temperature than at a conventional wall temperature. It has been found, however, that the inclusion of deposits thermal resistance at a conventional wall temperture results in higher heat fluxes at an elevated wall temperature where the deposits are not formed. Besides, higher wall heat fluxes are estimated in heat insulated engines, if there is a large change in the combustion process due to a higher gas temperature. |
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