Abstract
In the current paper, numerical simulations of the combustion of turbulent CH4-H2 are presented employing the standard k-epsilon and the RNG k-epsilon for turbulence closure. The Fr-ED concept is carried out to account for chemistry/ turbulence interaction. The hydrogen content is varied in the fuel stream from 0% to 100%. The numerical solutions are validated by comparison with corresponding experimental data from the Combustion Laboratory of the University of Milan. The flow is directed radially outward. This method of fuel injection has been already been explored experimentally. The results show that the structure of the flame is described reasonably and both standard k-ɛ and RNG k- ɛ models can predict the flame shape. The general aspect of the temperature profiles is well predicted. The temperature profiles are indicating a different trend between CH4 and CH4/H2 fuel mixtures.
Highlights
Lean combustion emerges as a potential and an advantageous concept to attain efficiently the combustion process and control NOx emissions in power-generation gas turbines [1,2,3]
The simulated image of the investigated flame (100% CH4) shows a very similar shape compared to the experimental ones, typical of high swirl processes in transverse injection
Numerical simulations of a turbulent (CH4-H2)/air flame were conducted in this study
Summary
Lean combustion emerges as a potential and an advantageous concept to attain efficiently the combustion process and control NOx emissions in power-generation gas turbines [1,2,3]. Due to its high chemical reactivity, hydrogen could be used as a useful fuel addition to enhance the combustion of natural gas. Different investigations [5, 7, 8, 12, 13] were undertaken on the height of the blue cone and pointed out the influence of hydrogen injection in the increment of the combustion rate, the reduction of CO, CO2 and HC emissions, and the extension of the stable lean limit of natural gas burner [1, 9,10,11,12, 14,15,16]. Authors in [17] developed an experimental investigation in optically accessible propane/ hydrogen burner and found that
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