1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China e-mail:
3. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore e-mail:
4. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China e-mail:
5. Clean Energy Center, Temasek Engineering School, Temasek Polytechnic, Singapore 529757, Singapore e-mail: