Large eddy simulation of premixed combustion in spark ignited engines using a dynamic flame surface density model

摘要: In this work, cyclic combustion simulations of a spark ignition engine were performed using the Large Eddy Simulation techniques. The KIVA-4 RANS code was modified to incorporate LES capability. flame surface density approach implemented model process. Ignition and kernel models also developed simulate early stage propagation. A dynamic procedure formulated where all coefficients locally evaluated resolved test filtered flow properties during fully phase combustion. filtering technique adopted use in wall bounded systems. methodology then applied associated unsteady effects engine. implementation validated experimental data taken from same engine. Results show that, even with relatively coarser meshes used present has been able resolve evolution large number in-cylinder structures, which are more influential for performance. Predicted rate pressure rise is good agreement measurements. limits variations well within experimentally observed range. It demonstrate fluctuations reasonable degree fewer simulation cycles. significant variation propagation predicted by simulations.