Abstract
Within a Reynolds Averaged Numerical Simulation (RANS) approach for turbulence modelling, a computational investigation of a turbulent lifted H2/N2flame is presented. Various turbulent combustion models are considered including the Eddy Dissipation Model (EDM), the Eddy Dissipation Concept (EDC), and the composition Probability Density Function transport model (PDF) in combination with different detailed and global reaction mechanisms. Turbulence is modelled using the Standard k-ɛ model, which has proven to offer a good accuracy, based on a preceding validation study for an isothermal H2/N2jet. Results are compared with the published measurements for a lifted H2/N2flame, and the relative performance ofthe turbulent combustion models are assessed. It is observed that the prediction quality can vary largely depending on the reaction mechanism and the turbulent combustion model. The best and quite satisfactory agreement with experiments is provided by two detailed reaction mechanisms applied with a PDF model.
Highlights
Power generation by gas and steam turbines [1] depend largely on the combustion process
The purpose of the present paper is to present a “coherent” validation study, for a cascade of different turbulent combustion modelling strategies in a wide range
The inlet boundaries representing the central and coaxial jet are placed on the left boundary of the domain (x=0), whereas the right boundary (x=22d) is defined to be pressure boundary with a prescribed constant pressure and zero gradient conditions for the remaining variables
Summary
Power generation by gas and steam turbines [1] depend largely on the combustion process. Parallel to the efforts for exploiting new energy sources [2] as well as recovery techniques [3], combustion will continue to play an important role in power generation. This is true for renewables, as biomass [4] plays an important role. Combustion of hydrogen and hydrogen containing fuels occupies an important role in clean and efficient energy supply, environment protection and resource efficiency. Instead of combustion [5] the gasification of waste, biomass and coal [6] offers good possibilities for efficient and clean power generation. Its subsequent combustion is most welcome since it produces no carbon dioxide
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