The aim of this study is to advance the present capability for modelling soot production and
thermal radiation from turbulent jet diffusion flames. Turbulent methane / air jet diffusion
flames at atmospheric and elevated pressure are studied experimentally to provide data for
subsequent model development and validation.
Methane is only lightly sooting at atmospheric pressure whereas at elevated pressure the
soot yield increases greatly. This allows the creation of an optically thick, highly radiating
flame within a laboratory scale rig. Essential flame properties needed for model validation
are measured at 1 and 3 atm. These are mean mixture fraction, mean temperature, mean
soot volume fraction, and mean and instantaneous spectrally resolved radiation intensity.
These two flames are modelled using the parabolic CFD code GENMIX. The combustion
/ turbulence interaction is modelled using the conserved scalar / laminar flamelet approach.
The chemistry of methane combustion is modelled using a detailed chemistry laminar flame
code. The combustion model accommodates the non-adiabatic nature of the flames through
the use of multiple flamelets for each scalar. The flamelets are differentiated by the amount
of radiative heat loss that is included. Flamelet selection is carried out through the solution
of a balance equation for enthalpy, which includes a source term for the radiative heat loss.
A new soot model has been developed and calibrated by application to a laminar flame
calculation. Within the turbulent flame calculations the soot production is fully coupled
to the radiative loss. This is achieved through the use of multiple flamelets for the soot
source terms and the inclusion of the radiative loss from the soot (as well as the gases) in
the enthalpy source.
Spectral radiative emission from the flames has been modelled using the RADCAL code.
Mean flame properties from the GENMIX calculations are used as an input to RADCAL
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