The knowledge of the hot gas side heat load is a necessary prerequisite for the design of the advanced cooling scheme of a dry low-NOx combustor and the mechanical integrity (MIT) calculations of the combustor walls. The magnitude and the spatial distribution of the heat fluxes has to be known in the very early phase of the design, where there is no hardware available.
The evaluation of a combustor wall design has to be based on known process data, thermodynamic and combustion parameters and has to rely on computational methods and experience.
A stepwise computational approach is presented to reach this target utilising
• 1D flow and Nusselt-Number correlations
• 2-D boundary layer code
• computational fluid dynamics (CFD)
For the validation of the method atmospheric and pressurised single burner combustor tests were performed.
The relative merits and pitfalls of the different methods are discussed in detail. Recommendations for their utilisation within the design process and for their further development are given.