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The objective of this investigation is to compare and evaluate the cold flow mixing effectiveness of two popular fuel injection schemes for scramjet combustion; strut and ramp injectors. The performance evaluation is based on a combination of Computational Fluid Dynamics (CFD) and experimental measurements. The CFD calculations were carried out using the VULCAN (Viscous Upwind aLgorithm for Complex flow ANalysis) Navier-Stokes solver, and the experiments were conducted at the Air Force Research Lab supersonic mixing/combustion facility located at Wright Patterson Air Force Base. Results show the strut configuration to have superior mixing characteristics over the ramp configuration, with approximately the same total pressure loss. Overall, the comparison with preliminary experimental data was encouraging, and several flow features were identified that explained the behavior indicated by the far field measurements.

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