Evaluation of the flow in an intermediate turbine duct at off-design conditions
Paper in proceedings, 2008

Intermediate turbine ducts are used in modern turbofan engines for connecting the highpressure turbine with the low-pressure turbine. The demands for engines with higher by-pass ratios require these ducts to be more "aggressive", i.e., to have a larger radial off-set and to be shorter. However, the flow in the intermediate turbine ducts are complex and therefore difficult to predict. Therefore a better understanding of the flow physics is necessary and measurements for CFD validation are needed. This paper presents time-averaged measurements of the flow in a state-at-the-art intermediate turbine duct with an upstream high-pressure turbine present. The investigation focuses on the intermediate turbine duct flow field development for different turbine conditions. The measurements consist of area traverses with a five-hole pressure probe at different axial locations within the intermediate turbine duct. In addition, a discussion of the endwall static pressure distribution and the overall pressure losses for the different conditions are done.


Lars-Uno Axelsson

Chalmers, Applied Mechanics, Fluid Dynamics

Gunnar Johansson

Chalmers, Applied Mechanics, Fluid Dynamics

ICAS 2008, 26th international congress of the aeronautical sciences, Alaska, August 2008


Subject Categories

Energy Engineering

Fluid Mechanics and Acoustics



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