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Flow induced energy losses in the exhaust port of an internal combustion engine

Accepted version
Peer-reviewed

Type

Article

Change log

Authors

Wang, Y 
Semlitsch, Bernhard  ORCID logo  https://orcid.org/0000-0001-7715-863X
Mihaescu, M 
Fuchs, L 

Abstract

jats:pA numerical study of the flow in the exhaust port geometry of a Scania heavy-duty diesel engine is performed using the large eddy simulation (LES) and an unsteady Reynolds-Averaged Navier–Stokes (URANS) simulation approach. The calculations are performed at fixed valve positions and stationary boundary conditions to mimic the setup of an air flow bench experiment, which is commonly used to acquire input data for one-dimensional engine simulations. The numerical results are validated against available experimental data. The complex three-dimensional (3D) flow structures generated in the flow field are qualitatively assessed through visualization and analyzed by statistical means. For low valve lifts, the major source of kinetic energy losses occurs in the proximity of the valve. Flow separation occurs immediately downstream of the valve seat. Strong helical flow structures are observed in the exhaust manifold, which are caused due an interaction of the exhaust port streams in the port geometry.</jats:p>

Description

Keywords

40 Engineering, 4002 Automotive Engineering, 4007 Control Engineering, Mechatronics and Robotics, 4012 Fluid Mechanics and Thermal Engineering, 4017 Mechanical Engineering

Journal Title

Journal of Fluids Engineering, Transactions of the ASME

Conference Name

Journal ISSN

0098-2202
1528-901X

Volume Title

137

Publisher

ASME International

Rights

All rights reserved