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Simulation research on the effect of cooled EGR, supercharging and compression ratio on downsized SI engine knock

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Abstract

Knock in spark-ignition(SI) engines severely limits engine performance and thermal efficiency. The researches on knock of downsized SI engine have mainly focused on structural design, performance optimization and advanced combustion modes, however there is little for simulation study on the effect of cooled exhaust gas recirculation(EGR) combined with downsizing technologies on SI engine performance. On the basis of mean pressure and oscillating pressure during combustion process, the effect of different levels of cooled EGR ratio, supercharging and compression ratio on engine dynamic and knock characteristic is researched with three-dimensional KIVA-3V program coupled with pressure wave equation. The cylinder pressure, combustion temperature, ignition delay timing, combustion duration, maximum mean pressure, and maximum oscillating pressure at different initial conditions are discussed and analyzed to investigate potential approaches to inhibiting engine knock while improving power output. The calculation results of the effect of just cooled EGR on knock characteristic show that appropriate levels of cooled EGR ratio can effectively suppress cylinder high-frequency pressure oscillations without obvious decrease in mean pressure. Analysis of the synergistic effect of cooled EGR, supercharging and compression ratio on knock characteristic indicates that under the condition of high supercharging and compression ratio, several times more cooled EGR ratio than that under the original condition is necessarily utilized to suppress knock occurrence effectively. The proposed method of synergistic effect of cooled EGR and downsizing technologies on knock characteristic, analyzed from the aspects of mean pressure and oscillating pressure, is an effective way to study downsized SI engine knock and provides knock inhibition approaches in practical engineering.

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Authors and Affiliations

  1. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Gequn Shu, Jiaying Pan, Haiqiao Wei & Ning Shi

Authors
  1. Gequn Shu
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  2. Jiaying Pan
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  3. Haiqiao Wei
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  4. Ning Shi
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Corresponding author

Correspondence to Haiqiao Wei.

Additional information

This project is supported by National Natural Science Foundation of China(Grant No. 51176138), and Tianjin Municipal Natural Science Foundation of China(Grant No. 12TJZDTJ28800)

SHU Gequn, born in 1964, is currently a professor and a director at State Key Laboratory of Engines, Tianjin University, China. He received his bachelor degree in internal combustion engines from Zhejiang University, China and both his master and PhD degrees from Department of Thermal Energy Engineering, Tianjin University, China. He has been working in Tianjin University, China. His research interests include engine noise and vibration and modern design technique, etc.

PAN Jiaying, born in 1987, is currently a PhD candidate at State Key Laboratory of Engines, Tianjin University, China. He received his bachelor degree in thermal energy and power engineering from Shandong University of Science and Technology, China and his master degrees from Internal Combustion Engines, Tianjin University, China. His research interests include engine combustion, SI engine knock, etc.

WEI Haiqiao, born in 1974, is currently an associate professor at State Key Laboratory of Engines, Tianjin University, China. He received his bachelor degree from North China Electric Power University, China. He received his PhD degree from Department of Mechanical Engineering, Tianjin University, China. His research interests include combustion processes and engine noise and vibration, SI engine downsizing.

SHI Ning, born in 1988, is currently a master candidate at State Key Laboratory of Engines, Tianjin University, China. He received his bachelor degree from Nanjing Agricultural University, China. His research interests include engine combustion, SI engine knock, etc.

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Shu, G., Pan, J., Wei, H. et al. Simulation research on the effect of cooled EGR, supercharging and compression ratio on downsized SI engine knock. Chin. J. Mech. Eng. 26, 341–350 (2013). https://doi.org/10.3901/CJME.2013.02.341

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