Investigation of unsteady mixing and combustion effects presents a significant interest in the design and optimization of direct injection spark-ignition (DISI) engines. The main attention focused on the analysis of impact of in-cylinder velocity cyclic variations on mixing and combustion processes. For this purpose multi-cycle large eddy simulation (LES) of the flow, mixing and combustion have been done in a realistic four-stroke internal combustion (IC) engine. The LES method has been used to simulate up to 50 consecutive engine cycles. The paper summarizes the main findings regarding cycle-to-cycle variations of in-cylinder velocity flow filed as well as mixing processes. Then the unsteady effects of spray combustion processes are discussed in details.
Towards Large Eddy Simulation of Spray Combustion in Direct Injection Spark Ignition Engine
Sae Technical Papers
SAE International Powertrains, Fuels and Lubricants Meeting ; 2011
2011-08-30
Aufsatz (Konferenz)
Englisch
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