An advanced axial-slot casing treatment on a tip-critical transonic compressor rotor Part 2: Taking a closer look with CFD

J. A. Streit, C. Brandstetter, F. Heinichen, H. P. Kau

Research output: Contribution to journalConference articlepeer-review

Abstract

The numerical and experimental investigation of non-axisymmetric casing treatments is complex compared to axisymmetric ones like circumferential grooves. Hence they are still rarely investigated, at least regarding combinations of numerical and experimental work on the same configuration. The casing treatment under investigation is capable of significantly broadening the operating range of a tip-critical transonic compressor. This is accomplished without an efficiency penalty at design conditions. It is demonstrated that the application of a casing treatment over the rotor might impose negative effects on the downstream stator that would have to be considered in future designs. The first part of this publication is focused on the experimental investigation, in particular of transient effects near stall. In this second part, RANS and URANS simulations are presented in detail. These are used to further study and explain the causes of the effects that were found experimentally. Additional experimental data is added where appropriate, continuing the validation of the numerical methods commenced in part one.

Original languageEnglish
Pages (from-to)72-82
Number of pages11
JournalEuropean Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC
StatePublished - 2014
Event10th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2013 - Lappeenranta, Finland
Duration: 15 Apr 201319 Apr 2013

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