A Parametric design of compact exhaust manifold junction in heavy duty diesel engine using computational fluid dynamics codes

Abstract

Nowadays, computational fluid dynamics codes 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 computational fluid dynamics software is used to obtain the total energy losses in adiabatic compressible flow at compact exhaust manifold junction. A steady-state one-dimensional 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 expe-rimental data from the literature and will be applied as a boundary condition in one-dimensional global simulation models of fluid systems in which these com-ponents are present.