Abstract
Favre-Averaged Numerical Simulations of the Adelaide Jet in Hot Coflow burner are carried out to study correlations between the Heat Release Rate and both species mole fractions and net reaction rates. A modified Eddy Dissipation Concept model is employed to implement a detailed kinetic scheme, including also the excited species OH*, conventionally used as Heat Release Rate marker. The effect of oxygen dilution, which, if strong enough, can lead to Moderate or Intense Low-oxygen Dilution (MILD) combustion, is investigated, by analyzing the correlations for two levels of oxygen concentrations. The results suggested the possibility of combining more chemical species to reconstruct an appropriate scalar able to better correlate with the Heat Release Rate (HRR). Indeed, it was found that for the configurations of interest, radicals O, OH, OH* correlate fairly well with the HRR, but even better correlations can be achieved with appropriate products of species mole fractions. This finding is particularly relevant for the MILD region of the flame.
Highlights
The Heat Release Rate (HRR) is a key physical quantity in combustion processes
The product mole fractions of OH and CH2O proposed by Paul and Najm (1998), and of H and CH2O suggested by Nikolaou and Swaminathan (2014) are taken into consideration
It is worth to remember that Moderate or Intense Low-Oxygen Dilution (MILD) combustion is achieved in the first 100 mm downstream of the burner exit for the HM1 case
Summary
The Heat Release Rate (HRR) is a key physical quantity in combustion processes. It represents the amount of heat released per unit of time and space due to chemical reactions. Its spatial distribution directly influences important physical phenomena such as flame-turbulence interactions, sound generation and its interaction with flames This latter may results in combustion instabilities, affecting the behavior of practical devices, such as gas turbines (Nikolaou and Swaminathan, 2014). A direct measurement of the HRR would involve the accurate determination of a significant number of scalars simultaneously (Nikolaou and Swaminathan, 2014) Due to such a high complexity, it is more practical to measure a quantity that presents some correlation with this rate over the relevant range of flame and flow parameters (Najm et al, 1998b), to qualitatively estimate the local HRR
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