a priori evaluation of subgrid-scale combustion models for diesel engine applications论文.pdf

Fuel 153 (2015) 612–619 Contents lists available at ScienceDirect Fuel journal homepage: www.else /locate/fuel A priori evaluation of subgrid-scale combustion models for diesel engine applications M.M. Ameen a,⇑, J. Abraham a,b a School of Mechanical Engineering, Purdue University, W Lafayette, IN 47907, USA b School of Mechanical Engineering, University of Adelaide, Adelaide, South Australia 5005, Australia h i g h l i g h t s Evaluation of subgrid-scale turbulence/chemistry interaction models. PSR and UFPV models are assessed for diesel engine combustion. UFPV model is generally superior to PSR model. a r t i c l e i n f o a b s t r a c t Article history: Large Eddy Simulation (LES) is being increasingly used for turbulent reacting flows in diesel engines. The Received 28 November 2014 accuracy of LES depends strongly on the accuracy of the subgrid-scale models, which are employed. In Received in revised form 3 March 2015 this study, two-dimensional DNS of autoigniting turbulent mixing layers are performed at temperature Accepted 10 March 2015 and pressure conditions similar to those observed in diesel engines. The DNS results are used to evaluate Available online 28 March 2015 the performance of two common subgrid-scale combustion models that are employed in diesel combus- tion modeling – the perfectly stirred reactor (PSR) model and the unsteady flamelet progress varia