Modeling of turbulent supersonic H2-air combustion with a multivariate beta PDF
Abstract
Recent calculations of turbulent supersonic reacting shear flows using an assumed multivariate beta PDF (probability density function) resulted in reduced production rates and a delay in the onset of combustion. This result is not consistent with available measurements. The present research explores two possible reasons for this behavior: use of PDF's that do not yield Favre averaged quantities, and the gradient diffusion assumption. A new multivariate beta PDF involving species densities is introduced which makes it possible to compute Favre averaged mass fractions. However, using this PDF did not improve comparisons with experiment. A countergradient diffusion model is then introduced. Preliminary calculations suggest this to be the cause of the discrepancy.
- Publication:
-
Joint Propulsion Conference and Exhibit
- Pub Date:
- June 1993
- Bibcode:
- 1993jpmc.confRW...B
- Keywords:
-
- Hydrogen Fuels;
- Multivariate Statistical Analysis;
- Probability Density Functions;
- Reacting Flow;
- Supersonic Combustion;
- Turbulence Models;
- Turbulent Combustion;
- Hypersonic Flight;
- Shear Flow;
- Turbulent Diffusion;
- Fluid Mechanics and Heat Transfer