Large Eddy Simulation of Premixed-Flame in Engine based on the Multi-Level Formulation and the Renormalization Group Theory

Paper #:
  • 920590

Published:
  • 1992-02-01
Citation:
Naitoh, K., Itoh, T., Takagi, Y., and Kuwahara, K., "Large Eddy Simulation of Premixed-Flame in Engine based on the Multi-Level Formulation and the Renormalization Group Theory," SAE Technical Paper 920590, 1992, https://doi.org/10.4271/920590.
Pages:
18
Abstract:
Large Eddy Simulation of the turbulent premixed-flame in engine is performed in a wide range of the operating conditions such as engine speed, air-fuel ratio, and ignition timing. Firstly, a mathematical formulation suitable for Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS) of the compressible turbulence and combusting flows is derived, which is the Multi-Level formulation. And a numerical algorithm based on the formulation is developed in order to calculate precisely the supergrid fluctuations of the physical quantities. As the determinations of the subgrid-turbulence and flame wrinkling, the Yakhot-Orszag turbulence model based on the Renormalization Group theory(RNG theory) and a flame-sheet model are combined with the numerical code. Computations are performed for a real engine with dual intakeport and valves. Obtained computational data agrees well with the experimental data on turbulence-intensity and pressure history.
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