An Improved Lobed Strut Injector Concept for Supersonic Combustion

A major problem in supersonic combustion is the short residence time of the fluid inside the combustor due to high flow velocities. Thus techniques for mixing enhancement have to be used to achieve a fast and efficient fuel-air mixing. In the present paper, different types of strut fuel injectors are investigated numerically. All strut injectors use lobed structures to create streamwise vorticity to achieve a faster mixing. A new concept for a single wedge lobed strut injector (SWLS) will be presented which is compared with an older double wedge strut injector concept. It will be shown, that the SWLS injector improves mixing and combustion efficiency significantly. Additionally the new injector is able to achieve a complete combustion at higher equivalence ratios.

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