Zum Einfluss Hoher Freistromturbulenz, Intensiver Kuehlung und Einer Nachlaufstroemung Auf den Aeusseren Waermeuebergang Einer Konverktiv Gekuehlten Gasturbineschaufel (The Influence of High Free Stream Turbulence, Intensive Cooli

摘要

The external heat transfer on a convectively cooled gas turbine blade in cascade configuration was investigaged. The temperature profile in the blade cross section was calculated by a finite element method, using experimentally determined boundary conditions. The results show a pronounced correlation between the turbulence degree and the heat transfer on the global blade surface. Strong cooling of the blade surface causes a stabilization of the blade boundary layer. The measurements are in very good agreement with theoretically determined heat transitions for laminar and fully turbulent heat transfer; the agreement for laminar-turbulent transition is less good. The effect of the local wake turbulence structure on the heat transfer behavior along the blade surface was determined. A model calculation of a moving wake provides the quasi-stationary temperature profile.