Abstract
Keywords:
1D network flow model, 3D CFD model, Cooling performance, Cooling Module, Engine Room
Abstract
In order to meet the new emission regulation that limits the amount of NOx and PM produced by heavy duty diesel vehicles, the cooled EGR or SCR methods are usually adopted. The EGR method normally requires redesign of the engine cooling systems. Specially, the design specifications of a radiator and a charge air cooler should be determined by the heat removal requirement from an engine and the outlet condition of a turbocharger. CFD is frequently utilized to determine the cooling systems specifications, as performance of computers and software is evolved. However, the 3D CFD analysis is difficult to apply at a conceptual design stage, since it, in its nature, requires detailed CAD information. In this regard, the 1D network flow analysis can be effectively used with appropriate test data for the components. In the present study, the feasibility of using the 1D network flow analysis early in the design stage is studied to find out its validity and limitation in the engine cooling system design, through comparison with the results of the 3D CFD analysis and test. It is found out that the 1D model can efficiently produce reliable results at the early design stage, while certain conditions should be met for successful application of the 1D model.