CFD modelling of CH4 air flames characteristics issuing from a two-slot EV-burner

الملخص EN

The need for high power, stable and efficient combustion, high turndown ratio and low noise while complying with the ever-increasing stringent environmental standards has proven to be a great challenge for scientists and engineers.

Environmental Vortex (EV) burners appear to be one of the promising ways to fulfill this challenge via inducing self-swirl flows to enhance fuel and air mixing and hence to provide efficient combustion with low emissions.

This paper introduces a CFD algorithm to predict the flame flow fields and exhaust emissions for a twoslot half cone EV-burner.

The examined test cases are conducted at a fixed air flow rate and varying equivalence ratio.

The turbulence model used is the Baseline Explicit Algebraic Reynold Stress Model (BSL EARSM).

This model combines the advantages of the scale determining models and the non-linear constitutive models, The former provides scalar information about the turbulence while the later determines the Reynolds stress tensor responsible for capturing non-equilibrium effects.

This combination has proven to be even superior to the Shear Stress Transport (SST) model, the recommended model for aerodynamics applications.

The predicted exhaust temperatures and NOx emissions are in good compliance with the experimentally measured values.