A Comparison of Finite-Rate Chemistry and Flamelet Generated Manifold Approaches in a Premixed Cavity Stabilized Combustor
Abstract
Numerical simulations of combustor physics can become prohibitively expensive when a detailed mechanism is utilized to model the reactions and intermediate species production. Flamelet models are able to avoid this issue by pre-calculating the chemistry using simplified 0D or 1D calculations and tabulating the results to be interpolated into the 3D simulations. In the current study, Reynolds Averaged Navier-Stokes simulations are performed on the University of Virginia Supersonic Combustion Facility (UVASCF) using a 32 species, 206 reaction ethylene-air skeletal mechanism using both finite-rate chemistry (FRC) and a flamelet generated manifold (FGM). The simulations are performed on the same mesh and using identical boundary conditions to identify the influence of the chemistry modeling approach on the solution. The results demonstrate differences in the species distribution for the FGM methodology as the CH2O production is more diffuse and OH production is more stratified. The outflow characteristics are compared to each other and are revealed to be in reasonable agreement while the computational cost for the FGM method decreased by approximately 32x as compared to the cost with FRC.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 04, 2023
- Accession Number
- AD1199050
Entities
People
- Cal J. Rising
- Gabriel B. Goodwin
Organizations
- United States Naval Research Laboratory