Heat loss prediction of a confined premixed jet flame using a conjugate heat transfer approach

• Published in: International journal of heat and mass transfer 2017-04, Vol.107, p.882-894
• Main Authors: Gövert, S., Mira, D., Zavala-Ake, M., Kok, J.B.W., Vázquez, M., Houzeaux, G.
• Format: Article
• Language: English
• Subjects: Boundary conditions; Combustion chambers; Combustió; Combustors; Computational fluid dynamics; Conduction heating; Conductive heat transfer; Conjugate heat transfer; Energies; Heat loss; Heat transfer; Induction heating; Large eddy simulation; Non-adiabatic turbulent combustion; Radiation; Transferència d'energia; Turbulence; Àrees temàtiques de la UPC
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2016.10.122

•CHT improves prediction of brunt gas temperatures in near wall recirculation areas.•CHT does not have a significant effect on flame shape and length.•The solid acts as a low-pass filter for the transport of temperature fluctuations.•Radiative heat transfer is a an order of magnitude less than convective heat transfer.•Radiative heat transfer is important in the flame front and hence for flame dynamics. The presented work addresses the investigation of the heat loss of a confined turbulent jet flame in a lab-scale combustor using a conjugate-heat transfer approach and large-eddy simulation. The analysis includes the assessment of the principal mechanisms of heat transfer in this combustion chamber: radiation, convection and conduction of heat over walls. A staggered approach is used to couple the reactive flow field to the heat conduction through the solid and both domains are solved using two implementations of the same code. Numerical results are compared against experimental data and an assessment of thermal boundary conditions to improve the prediction of the reactive flow field is given.