1. Chair of Hydraulic Fluid Machinery, Ruhr University Bochum, Universitätsstraße 150, Bochum 44801, Germany
2. School of Energy and Power Engineering, Xi'an Jiaotong University, 28 Xianning West Road, Shaanxi Xi'an 710049, China
3. Department of Mechanical Engineering, Technische Universität Darmstadt, Otto-Berndt-Straße 2, Darmstadt 64287, Germany