The Straight Cascade Tunnel Göttingen (EGG)
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The Straight Cascade Tunnel, installed at the DLR Institute of Propulsion Technology in Göttingen, is a versatile facility for detailed experimental investigation of flow processes within turbomachinery.
This German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) large-scale facility is used for experimental research on straight turbine cascades with a simplified flow (two-dimensional, stationary) and enables research over a very wide Mach range (from low subsonic to high supersonic flow). The EGG is operated continuously in a closed circuit; Mach and Reynolds numbers can be adjusted independently.
Focus on turbine blade profiles
The experiments are conducted by simulating cooling air in a simplified model of turbine flow (two-dimensional, stationary). Researchers are studying the profiles of turbine blades, their boundary layer behaviour and heat transfer on cooled blades. The fundamental experiments performed in the large-scale facility provide a better understanding of the impact of flow in a blade passage (boundary layers, separation, etc.) and contribute towards the more efficient use of cooling air in turbines. The extensive experimental findings are used to validate numerical methods.