On the influence of the correlation between enthalpy defect and mixture fraction in sooting turbulent jet flames

The effects of the cross correlation between mixture fraction and enthalpy defect on flames structure and radiative heat transfer are investigated using a hybrid Stochastic Eulerian Field/flamelet model. An ethylene turbulent jet diffusion flame is simulated by considering or not this correlation. Model results show that mixture fraction and enthalpy defect are strongly correlated in the region located downstream the peak of temperature. Neglecting this correlation affects the flame structure in a non-negligible manner in this part of the flame. In addition, the radiative loss and the radiative flux are significantly enhanced when the correlation is disregarded. - Highlights: • The effects of the correlation between mixture fraction and enthalpy defect are investigated. • Mixture fraction and enthalpy defect are correlated over a large part of the flame. • The correlation affects flame structure downstream the peak of soot volume fraction. • Neglecting this correlation is also found to increase the radiative loss by about 20%.