EGR is a proven technology used to reduce NOx formation in both compression and spark ignition engines by reducing the combustion temperature. In order to further increase its efficiency the recirculated gases are subjected to cooling. However, this leads to a higher load on the cooling system of the engine, thus requiring a larger radiator. In the case of turbocharged engines the large variations of the pressures, especially in the exhaust manifold, produce a highly pulsating EGR flow leading to non-steady-state heat transfer in the cooler. The current research presents a method of determining the pulsating flow field and the instantaneous heat transfer in the EGR heat exchanger. The processes are simulated using the CFD code FIRE (AVL) and the results are subjected to validation by comparison with the experimental data obtained on a 2.5 liter, four cylinder, common rail and turbocharged diesel engine.
Transient Fluid Flow and Heat Transfer in the EGR Cooler
Sae Int. J. Engines
SAE World Congress & Exhibition ; 2008
Sae International Journal of Engines ; 1 , 1 ; 558-570
2008-04-14
13 pages
Conference paper
English
Transient fluid flow and heat transfer in the EGR cooler
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