Abstract
To investigate the coupled effects of secondaryow, stability (or instability) due to Coriolis force, and adverse pressure gradient on theow in a rotating diffuser of low aspect ratio, quantitative experiments were performed. Thediffuserhadparallelendwallsandstraightsidewalls,whichcouldvaryitsincludedangleupto18deg.Pressure, mean velocity, and turbulence intensity were measured with a pressure transducer, hot-wire anemometers, and a transmission system of electrical signals from a rotating apparatus to the stationary system. Experimental results indicate the formation of a stable large separatedow region on the suction side and a through-¯ ow region on the pressure side. Theow pattern was steady, and once the separation occurred, the change of the angular velocity had littleorno effectonthemeanvelocity and turbulenceintensitypro® lesatthemidheightoftherotating diffuser. Nomenclature Cp = static pressure coef® cient H12 = shape factor p = static pressure pt = total pressure Re = Reynolds number, Umx/m Ri
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