Simulating the Blow-Out of a Premixed Ammonia/Hydrogen/Nitrogen-Air Flame
We used large eddy simulation (LES) with the detailed chemistry solver in CONVERGE to investigate the combustion characteristics of a premixed ammonia/hydrogen/nitrogen-air flame. Ammonia is a promising energy carrier that could eliminate CO2 emissions from gas turbine engines, but the combustion properties of pure ammonia are not well suited to gas turbine combustion. When ammonia is blended with hydrogen and nitrogen, however, the mixture exhibits more favorable combustion characteristics. For this simulation, we took advantage of the Computational Chemistry Consortium’s C3MechV3.3, which contains accurate chemistry for ammonia and hydrogen. The first view in the video shows a photorealistic rendering of the flame and air, which then transitions to show the temperature isosurface of the flame (1500 K) colored by velocity magnitude. The final view shows a slice with temperature contours and the mesh. You can see CONVERGE’s fixed embedding capability to refine the grid in the flame and recirculation zone. As the velocity of the inflow increases, the flame blows out. With LES and detailed chemistry, CONVERGE accurately predicts the blow-out velocity compared to experimental data.
Convergent Science's CONVERGE is an innovative computational fluid dynamics (CFD) software package that eliminates the grid generation bottleneck from the simulation process through autonomous meshing.
