Abstract
An annular ® lm cooled turbine nozzle with cooling air ejection from a single row of holes on the stator suction side near the trailing edge is experimentally and numerically investigated concerning the inuence of ® lm cooling on the secondaryow development. The location and intensity of the secondaryow vortices are analyzed with varied blowing rates. Theow® eld downstream of the nozzle is measured using a ® ve-hole probe. Furthermore, oilow experiments are carried out to visualize the areas on the blade surface affected by the secondaryow. A three-dimensional Navier± Stokes solver numerical simulation of the statorow including cooling air ejection supports the measurements. This gives an insight to vortex generation and development inow regions, where measurements are dif® cult or impossible. Depending on the blowing ratio the secondary vortex system is deected toward the endwalls. A detailed analysis is presented. Nomenclature C = chord length, m d = diameter, m h = blade height, m M = blowing ratio, (q v)c/(q v)0 Ma = Mach number
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