An engineering model to predict flow features of a sonic or supersonic gaseous jet into supersonic crossflow

This study presents an engineering model that can be used to predict key parameters of the flowfield created by injecting a sonic or supersonic gaseous jet into a supersonic crossflow, using a flush-wall mounted injector. The four parameters of interest predicted are the jet penetration into the freestream, the entrainment and mixing characteristics, the pressure losses due to associated shocks, and the fuel jet’s stoichiometric surface for a non-premixed, non-reacting case. Results are compared to experimental data and differences are analyzed including the differences in mixing and entrainment between jet-in-subsonic-crossflow and jetin-supersonic-crossflow injection schemes. A genetic optimization algorithm is then coupled to the model to analyze the model’s predictive capability. It is shown that the model results are close to the actual engineering design of the HyShot II combustor, based on reported inflow conditions from flight experiments. The relevance of this type of fast engineering model in injector design is also discussed.