1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
2. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
3. Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, 210016 Nanjing, P. R. China