Comparison of 0D and 1D duct system modeling for naturally aspirated spark ignition engines 2011-01-1898
Acoustics influence on internal combustion engine volumetric efficiency is obvious and the use of modeling to represent its effect is largely spread. In this regard, LMS has developed a new 1D model library, namely CFD1D, to model engine intake and exhaust lines under LMS Imagine. Lab AMESim platform.
Simulations have been performed at IFP Energies nouvelles (IFPEN) to compare duct system modeling with two different approaches: on the one side, with the brand new 1D library and on the other side, with state-of-the-art 0D lumped parameter models (IFP-Engine library under the same platform).
This paper aims at comparing 0D and 1D modeling strategies for two naturally-aspirated spark-ignition engines: a single-cylinder propane-fueled engine and a Honda K20A engine with a dedicated intake system used for a cylinder deactivation concept development.
For each application, a 0D and a 1D intake system model is realized, based on real engine test-bed geometry. The line description of the system geometry is performed either with multiple 0D pipe models representing mass transfers or with 1D elements accounting for full acoustics phenomena. Each type of line description is associated with the same combustion model for each application to obtain a sound comparison on steady-state operating points. Calculated pressure traces in pipes are in good agreement with high frequency test bench measurements for both engine cases and modeling approaches. Finally, a comparison of the modeling approaches is provided in terms of accuracy and CPU time consumption.