1. Laboratory for Energy Conversion, Department of Mechanical and Process Engineering, ETH Zurich, Zurich CH-8092, Switzerland
2. Department of Mechanical Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
3. Power and Industrial Systems Research and Development Center, Toshiba Corporation, Yokohama 230-0045, Japan
4. Turbine Design and Assembling Department Toshiba Corporation, Yokohama 230-0045, Japan