1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, People’s
Republic of China
2. Key Laboratory for Power Machinery and Engineering of Ministry of
Education, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
3. Department of Mechanical Science
and Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801,
United States
4. Center for Combustion Energy and State Key Laboratory of Automotive
Safety and Energy, Tsinghua University, Beijing 100084, People’s Republic of China