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A parametric design of compact exhaust manifold junction in heavy duty diesel engine using CFD

Author(s): Naeimi Hessamedin | Domiry Ganji Davood | Gorji Mofid | Javadirad Ghasem | Keshavarz Mojtaba

Journal: Thermal Science
ISSN 0354-9836

Volume: 15;
Issue: 4;
Start page: 1023;
Date: 2011;
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Keywords: total pressure loss coefficient | numerical simulation | compact exhaust manifold junction | experimental data

Nowadays, computational fluid dynamics codes (CFD) are prevalently used to simulate the gas dynamics in many fluid piping systems such as steam and gas turbines, inlet and exhaust in internal combustion engines. In this paper, a CFD software is used to obtain the total energy losses in adiabatic compressible flow at compact exhaust manifold junction. A steady state onedimensional adiabatic compressible flow with friction model has been applied to subtract the straight pipe friction losses from the total energy losses. The total pressure loss coefficient has been related to the extrapolated Mach number in the common branch and to the mass flow rate ratio between branches at different flow configurations, in both combining and dividing flows. The study indicate that the numerical results were generally in good agreement with those of experimental data from the literature and will be applied as a boundary condition in one-dimensional global simulation models of fluid systems in which these components are present.

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