Global Power and Propulsion (GPPS): Montreal18 - Proceedings
Published May 7, 2018 | Version v1
Conference paper Open

On Clean Inflow Testing for Intermediate Turbine Ducts

Creators

  • 1. Graz University of Technology, Austria
  • 2. Politecnico di Milano Italy
  • 3. MTU Aero Engines Germany
  • 4. GE Aviation Germany

Description

In this paper, an investigation on the effect of different inlet conditions on an engine representative turbine centre frame (TCF) is presented. A comparison between three cases is obtained in the new high speed annular cascade rig at the Institute for Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. Differing from the engine realistic inlet conditions, a case with clean inflow, a case with IGVs and a case with IGVs and with spoke wheel are considered. Furthermore, a fourth inlet case is taken into account, namely the case with the unshrouded, uncooled HPT imposed inlet flow condition (rotating rig).

A back-to-back comparison of the inlet and exit flow fields is based on time averaged data, obtained by five-hole- probe measurements. For the flow through the duct, the pressure rise coefficient at the duct hub and case as well as along the strut surface is evaluated. In addition, a state-of-the- art oil flow visualisation technique is used to determine the change of the wall shear stresses in the duct. CFD simulations also support the discussion and give additional insight into the flow behaviour.

The major outcomes of the present study are that the investigated duct, not separating downstream of the HPT stage, does separate when unsteady effects are removed. Moreover, the duct efficiency cannot be foreseen from clean inflow testing, since the throughflow is completely different. Finally, radial exit profiles can be matched along all four cases presented, with reasonable agreement.

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References

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