---

The goal of this study is the investigation of the promising secondary flow control technique of non-axisymmetric end wall profiling in a more engine representative environment. In this work end wall profiling is applied to the first stage of a high work, 1.5 stage, unshrouded turbine. Without purge flow non-axisymmetric end wall profiling has demonstrated a considerable increase of total-to-total efficiency. The two designs increased the total-to-total efficiency by 1% and 0.3% respectively relative to a baseline efficiency of already 91%. The first end wall design having the highest efficiency without purge flow shows the highest efficiency drop of 1.2% per injected massflow percent if purge flow is applied. The second end wall design and the baseline case show comparable sensitivities with -0.7%/% and -0.6%/% to purge flow. The reason for the increased sensitivity of the first design is an increased circumferential pressure gradient at the first vane rim compared to the baseline case and the second end wall design. Resulting in the strongest injection jets and therefore in more induced vorticity.

---

Peter Schüpbach, born May 7, 1978 in Bern, Switzerland Education 1999-2005 Studies in Mechanical Engineering, ETH Zürich 2005-2009 Research Assistant at Laboratory for Energy Conversion, ETH Zürich Professional Experience 2002 3 months internship at Gangloff AG, Bern 2002-2003 6 months internship at ABB Turbo Systems, Baden

---