Three-dimensional combustor performance validation with high-densityfuels

A combustor performance model that utilizes the detailed representation of the flowfield made available through analytical three-dimensional codes and the predictive tool of the empirical correlations is validated with high-density fuels data. These data were obtained by burning four different fuel types that varied over a wide range of physical and chemical properties in addition to a baseline JP-4 fuel, in a single-can combustor rig. The predictions of the combustor model agree fairly well with the experimental data. Wall temperature predictions were made through the evaluation of the radiation flux components based on the detailed flowfield given by the three-dimensional code and the proper estimate of a view factor. The flame emissivity used in the calculations is dependent on the hydrogen content of the fuel. In addition to the data evaluation effort, the combustor model was used to define the changes needed in the system to alleviate the unfavorable characteristics brought by the high-density fuels. An improved fuel injection concept and primary zone mixing are the main modifications suggested to achieve acceptable performance.