Flame Visualisation Based on Computational Fluid Dynamics (CFD) Results

摘要

A validation study is often the first step in applying computational fluid dynamics (CFD) models to an industrial-scale combustion system. This helps build both operator and modeller confidence in the CFD model. It can be difficult to get quantitative measurements to compare against because of the large scale and hostile environments generally associated with these systems. Operators do, however, tend to have optical access to the system so the visible flame can be used as a qualitative indicator of the validity of a simulation. Proper visualisation of the visible flame requires solving the radiative transfer equation at discrete wavelengths within the visible spectrum. This calculation is not usually part of a CFD model because it has negligible impact on the engineering performance of the system. An interim approach has been developed which uses the existing model results of species concentration and energy levels to simulate the appearance of the flame.