Abstract
ABSTRACTIn the work, an extension of the eddy-dissipation model (EDM) is developed to simulate turbulent combustion of hydrogen in undiluted oxygen in rocket combustion chambers. The modification of the eddy-dissipation model allows eliminating of main demerits of the original EDM model. This is achieved by introducing additional parameters into the model, which limit the reaction rate and depend on the local stoichiometry and temperature. The main such parameter is “Maximum flame temperature,” which depends on local stoichiometry and takes into account the dissociation of combustion products. The extension of the EDM model is based on the framework provided by ANSYS CFX. The new turbulent combustion model is validated against experimental data from three different subscale rocket combustors. The validation of the model is carried out against data on pressure and wall heat flux, which are the main targets of simulations of rocket combustion chambers.
Highlights
Most of us associate rocket combustion chambers with high turbulence, pressure, and temperature, which is true
In the most turbulent combustion models, which are used in the thin-flame assumption, the combustion rate is proportional to the rate of turbulent mixing
The developed model can operate in the wide ranges of fuel-to-oxidizer ratios and of injection temperatures starting from cryogenic
Summary
Most of us associate rocket combustion chambers with high turbulence, pressure, and temperature, which is true. At high pressure and temperature, chemical reactions are so fast in such a way that they allow to use the assumption of thin flame, that is, of infinitely fast chemistry. This assumption holds very well for hydrogen in rocket combustion chambers (Ivancic and Mayer, 2002). The thin-flame assumption greatly simplifies the modeling of turbulent combustion as there is no need to solve kinetic equations, as they are infinitely fast. This does not mean infinitely fast combustion. In the most turbulent combustion models, which are used in the thin-flame assumption, the combustion rate is proportional to the rate of turbulent mixing
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