1. Laboratory of Engineering Thermodynamics (LTD), University of Kaiserslautern, Erwin-Schrödinger-Str. 44, D-67663 Kaiserslautern, Germany
2. Fluid Dynamics, Institute for Combustion and Gas Dynamics, University Duisburg-Essen, Carl-Benz-Str. 199, D-47057 Duisburg, Germany