Assessment and Improvement of Engineering Simulation for Multiphase Turbulent Combustion in a Lean Direct Injection Combustor

摘要

The single-element lean direct injection (LDI) combustor experiment is used as a testbed for assessing, further developing and validating the capability of two-phase turbulent combustion modeling and simulation. A series of numerical calculations have been carried out by using (1) the time filtered Navier-Stokes (TFNS) methodology ranging from the steady Reynolds averaged Navier-Stokes (RANS), unsteady RANS (URANS), to the dynamic flow structure simulation (DFS) , and (2) the large eddy simulation (LES) methodology. The sub-grid models employed for turbulent mixing and combustion include the well-mixed model, the linear eddy mixing (LEM) model, the filtered mass density function (FDF/PDF) model, and the flamelet-based model. Results from these methodologies invoking various sub-grid models are presented.