The Oxford Combustor-Turbine Interaction (CTI) rig employs an upstream combustor simulator to produce engine realistic approach flow conditions for a large scale, two-passage NGV cascade test section.
The combustor simulator features endwall film cooling, and opposed dilution ports to generate large scale, high intensity turbulence similar to that experienced in a modern civil turbofan engine. The cascade geometry is a linear extrusion of a modern engine NGV midspan cross section. The leading edge of the central vane is film-cooled. It is an easily removed, separate piece, which permits collection of both external surface temperature (via infrared measurements) and pressure (internal and external, via pressure tappings) data in high resolution and on multiple, rapidly prototyped leading edge geometries.
With the mainstream gas path heated electrically by a heater mesh, high density foam leading edges permit film effectiveness to be measured at steady-state. 3D-printed polymer leading edges feature internal pressure tappings. Tailboards downstream of the cascade are adjusted to simulate a periodic test section pressure distribution on the central vane.