Turbulent Diffuser Flow Studies Related to the Design of the ETW Diffuser,
DORNIER G M B H FRIEDRICHSHAFEN (GERMANY F R)
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A computational method based on the boundary layer concept is used for calculating turbulent flows in diffusers with circular cross sections. That newly developed method is shown to produce reasonable agreement with a critical experiment for which existing methods fail. In a parametric study, varying Reynolds- and Mach number for different diffuser inlet conditions, turbulent flows in the ETW diffuser are considered to describe the efficiency of the diffuser and the danger of flow separation. The Reynolds number range investigated was such, to cover flow situations from the 17.2 scale test under diffuser under non-cryogenic conditions to the full scale diffuser applying cryogenic conditions. In supplement some geometry modifications are studied to see whether the efficiency of the diffuser can possibly be augmented.