Large-eddy simulation of supersonic reacting mixing layers

Anand Kartha, Pramod K Subbareddy, Graham V. Candler, Paul E. Dimotakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


This paper studies chemically reacting, spatially evolving, supersonic mixing layers by performing large eddy simulations. Specifically, the goal is to reproduce the experimental results on molecular mixing and heat release performed at Caltech by Bonanos et al.1 Here, the mixing layer is formed as a result of the interaction of a supersonic stream and a subsonic stream. The supersonic stream expands over a 30° ramp and interacts with a subsonic stream of fluid injected into the combustor through the ramp. The primary (top) stream contains a small amount of H2 as the fuel. The secondary stream (injection through the ramp) contains a fractional amount of F2 which acts as the oxidizer. The hypergolic reaction between hydrogen and fluorine gives a large value of Damkohler number, which makes the chemistry fast and hence the product formation and temperature rise in the flow is mixing limited. Both reacting and non-reacting simulations were performed with two turbulence models (Smagorinsky and Vreman) and comparisons are made with the available experimental data. Limiters on species concentrations were used to ensure boundedness on these quantities. The simulations show a close agreement of the velocity profiles and the temperature rise profile to that measured in the experiment. The probability density functions have been computed and reveal significant changes in the mixture fractions at the probe locations, showing the effect of heat release on the flow field.

Original languageEnglish (US)
Title of host publication44th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102899
StatePublished - Jan 1 2014
Event44th AIAA Fluid Dynamics Conference 2014 - Atlanta, GA, United States
Duration: Jun 16 2014Jun 20 2014

Publication series

Name44th AIAA Fluid Dynamics Conference


Other44th AIAA Fluid Dynamics Conference 2014
Country/TerritoryUnited States
CityAtlanta, GA


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