A Diesel Engine converted to a Gasoline-Natural Gas Bi-Fuel System: Optimization of the Intake manifold system Using CFD Analysis

Mohamed Ali Jemni[1] , Gueorgui Kantchev, Mohamed Salah Abid

  National School of Engineers of Sfax (ENIS), Laboratory of Electro-Mechanic Systems (LASEM), B.P. 1173, km 3.5 Soukra, 3038 Sfax, TUNISIA.
[1] Corresponding author; Email:MohamedAli.Jemni@enis.rnu.tn
ABSTRACT
In order to improve the economic and ecological problems of Diesel engines, the optimization of the combustion process presents an effective solution, which in general requires the improvement of the intake aerodynamic movements. In this paper we have studied the geometry effects of two intake manifolds on the in-cylinder flows of a diesel engine converted into a gasoline-gas bi-fuel system. Two intake manifold geometries, the initial one on the engine and another based on an acoustically optimized one, are studied A three-dimensional numerical modeling of the turbulent in flow was undertaken based on the resolution of Navier-Stokes equations in conjunction with the standard k-e turbulence model, for the two manifolds, using the 3D CFD code FloWorks. This modeling made it possible to examine the structures of the in flow, and, therefore to determine the more adequate manifold design. Experimental measurements were also carried out to validate this manifold. Results of the simulation and experiments show the effectiveness of the optimized manifold.
KEYWORDS
CFD, intake manifold, in flow, model of turbulence.


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