In-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during the early stage of intake stroke, it is very difficult to clearly identify their transient characteristics because these vortices are of multiple length scales with very different swirl motion strength. In this study, a high-speed time-resolved two-dimensional (2D) particle image velocimetry (PIV) is applied to record the flow structure of in-cylinder flow field along a swirl plane at 30 mm below the injector tip. First, a discretized method using flow field velocity vectors is presented to identify the location, strength, and rotating direction of vortices at different crank angles. The transients of vortex formation and dissipation processes are revealed by tracing the location and motion of the vortex center during the intake and compression strokes. In addition, an analysis method known as the wind-rose diagram, which is implemented for meteorological application, has been adopted to show the velocity direction distributions of 100 consecutive cycles. Results show that there exists more than one vortex center during early intake stroke and their fluctuations between each cycle can be clearly visualized. In summary, this approach provides an effective way to identify the vortex structure and to track the motion of vortex center for both large-scale and small-scale vortices.
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September 2018
Research-Article
Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine
Fengnian Zhao,
Fengnian Zhao
University of Michigan–Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: iclover@sjtu.edu.cn
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: iclover@sjtu.edu.cn
Search for other works by this author on:
Penghui Ge,
Penghui Ge
University of Michigan-Shanghai,
Jiao Tong University Joint Institute
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: penghuige@sjtu.edu.cn
Jiao Tong University Joint Institute
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: penghuige@sjtu.edu.cn
Search for other works by this author on:
Hanyang Zhuang,
Hanyang Zhuang
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: zhuanghany11@sjtu.edu.cn
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: zhuanghany11@sjtu.edu.cn
Search for other works by this author on:
David L. S. Hung
David L. S. Hung
Mem. ASME
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: dhung@sjtu.edu.cn
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: dhung@sjtu.edu.cn
Search for other works by this author on:
Fengnian Zhao
University of Michigan–Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: iclover@sjtu.edu.cn
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: iclover@sjtu.edu.cn
Penghui Ge
University of Michigan-Shanghai,
Jiao Tong University Joint Institute
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: penghuige@sjtu.edu.cn
Jiao Tong University Joint Institute
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: penghuige@sjtu.edu.cn
Hanyang Zhuang
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: zhuanghany11@sjtu.edu.cn
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: zhuanghany11@sjtu.edu.cn
David L. S. Hung
Mem. ASME
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: dhung@sjtu.edu.cn
University of Michigan-Shanghai,
Jiao Tong University Joint Institute,
Shanghai Jiao Tong University,
800 Dongchuan Road,
Shanghai 200240, China
e-mail: dhung@sjtu.edu.cn
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 23, 2017; final manuscript received January 11, 2018; published online June 15, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Sep 2018, 140(9): 092807 (11 pages)
Published Online: June 15, 2018
Article history
Received:
October 23, 2017
Revised:
January 11, 2018
Citation
Zhao, F., Ge, P., Zhuang, H., and Hung, D. L. S. (June 15, 2018). "Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine." ASME. J. Eng. Gas Turbines Power. September 2018; 140(9): 092807. https://doi.org/10.1115/1.4039082
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