EXPERIMENTAL AND NUMERICAL STUDY OF TRANSONIC TURBINE CASCADE FLOW

A comprehensive study of the flowfield through a two-dimensional casca de of high-pressure turbine blades is presented. The experimental stud ies mere carried out on a cascade of 11 blades in a blow-down tunnel. The static pressure was measured on the cascade side wall and on the b lade surfaces. Total pressure and total temperature measurements were taken upstream of the cascade. Shadowgraph pictures were taken for a s tudy of the trailing-edge shock structure and for the turbulent transi tion location. A single-plate interferometer technique with a new eval uation method was used for density field measurement. For the numerica l studies the full Navier-Stokes equations were solved on a nonperiodi c C grid. In the attached boundary layer, the turbulence was modeled b y an extension of the Clauser eddy viscosity model developed for compr essible flow. In the trailing edge and wake region, the Baldwin-Lomax model was used. Good agreement between the measured and the calculated results was obtained for most aspects of the flowfield.