1. School of Aeronautics and Astronautics, Shanghai Jiao Tong University (SJTU), Shanghai, China
2. Transportation and Power Systems Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
3. Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom
4. Department of Mechanical & Manufacturing Engineering, Schulich School of Engineering, University of Calgary, T2L 1Y6 Calgary, Canada