1. School of Mechanical and Aerospace Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2. School of Mechanical and Aerospace Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
3. School of Energy and Power Engineering, Jiangsu University of Science and Technology, Mengxi Road 2, Zhenjiang 212003, Jiangsu, China e-mail: