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Effects of the injection strategy on the mixture formation and combustion characteristics in a DISI (direct injection spark ignition) optical engine

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  • Song, Jingeun
  • Kim, Taehoon
  • Jang, Jihwan
  • Park, Sungwook

Abstract

The present study investigates the effect of the injection strategy on the mixture quality and the consequential combustion characteristics. The injection strategies considered in the present study were divided into two parts: single injection (with a wide range of injection timings during the intake stroke) and double injection (with a short second injection during the compression stroke). The in-cylinder pressure and high-speed flame images were acquired to evaluate the combustion characteristics, and KIVA simulation was conducted to observe the in-cylinder flow and the fuel spray spreading procedure. For the single injection, retarding the injection timing caused an increase in the combustion speed and in-cylinder pressure. In this case, the major factor that increased the in-cylinder pressure was the turbulence intensity; the later injection produced a stronger turbulence at the spark timing, which caused a higher in-cylinder pressure. Meanwhile, the flame propagation direction was mainly affected by the equivalence ratio distribution. The flame speed toward the fuel-lean region was significantly slower than toward the fuel-rich region. The double injection strategy utilized the additional turbulence induced by the spray motion to increase the engine power.

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  • Song, Jingeun & Kim, Taehoon & Jang, Jihwan & Park, Sungwook, 2015. "Effects of the injection strategy on the mixture formation and combustion characteristics in a DISI (direct injection spark ignition) optical engine," Energy, Elsevier, vol. 93(P2), pages 1758-1768.
  • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:1758-1768
    DOI: 10.1016/j.energy.2015.10.058
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    2. Costa, M. & Catapano, F. & Sementa, P. & Sorge, U. & Vaglieco, B.M., 2016. "Mixture preparation and combustion in a GDI engine under stoichiometric or lean charge: an experimental and numerical study on an optically accessible engine," Applied Energy, Elsevier, vol. 180(C), pages 86-103.
    3. Fan, Baowei & Pan, Jianfeng & Yang, Wenming & Pan, Zhenhua & Bani, Stephen & Chen, Wei & He, Ren, 2017. "Combined effect of injection timing and injection angle on mixture formation and combustion process in a direct injection (DI) natural gas rotary engine," Energy, Elsevier, vol. 128(C), pages 519-530.
    4. Wang, Bin & Xie, Fangxi & Hong, Wei & Du, Jiakun & Chen, Hong & Li, Xiaoping, 2023. "Extending ultra-lean burn performance of high compression ratio pre-chamber jet ignition engines based on injection strategy and optimized structure," Energy, Elsevier, vol. 282(C).
    5. Su, Yu-Hsuan & Kuo, Ting-Fu, 2019. "CFD-assisted analysis of the characteristics of stratified-charge combustion inside a wall-guided gasoline direct injection engine," Energy, Elsevier, vol. 175(C), pages 151-164.
    6. Costa, M. & Sorge, U. & Merola, S. & Irimescu, A. & La Villetta, M. & Rocco, V., 2016. "Split injection in a homogeneous stratified gasoline direct injection engine for high combustion efficiency and low pollutants emission," Energy, Elsevier, vol. 117(P2), pages 405-415.
    7. Han, Taehoon & Singh, Ripudaman & Lavoie, George & Wooldridge, Margaret & Boehman, André, 2020. "Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines," Applied Energy, Elsevier, vol. 262(C).
    8. Liu, Zengbin & Zhen, Xudong & Tian, Zhi & Liu, Daming & Wang, Yang, 2024. "Study on the effect of injection strategy on the combustion and emission characteristics of direct injection spark ignition bio-butanol engine," Energy, Elsevier, vol. 289(C).
    9. Song, Jingeun & Lee, Ziyoung & Song, Jaecheon & Park, Sungwook, 2018. "Effects of injection strategy and coolant temperature on hydrocarbon and particulate emissions from a gasoline direct injection engine with high pressure injection up to 50 MPa," Energy, Elsevier, vol. 164(C), pages 512-522.
    10. Sun, Yao & Yu, Xiumin & Dong, Wei & Chen, Hong & Hu, Yunfeng, 2018. "Effect of split injection on particle number (PN) emissions in GDI engine at fast-idle through integrated analysis of optics and mechanics," Energy, Elsevier, vol. 165(PB), pages 55-67.
    11. Shi, Lei & Ji, Changwei & Wang, Shuofeng & Su, Teng & Cong, Xiaoyu & Wang, Du & Tang, Chuanqi, 2019. "Effects of second injection timing on combustion characteristics of the spark ignition direct injection gasoline engines with dimethyl ether enrichment in the intake port," Energy, Elsevier, vol. 180(C), pages 10-18.
    12. Duan, Xiongbo & Liu, Jingping & Tan, Yonghao & Luo, Baojun & Guo, Genmiao & Wu, Zhenkuo & Liu, Weiqiang & Li, Yangyang, 2018. "Influence of single injection and two-stagnation injection strategy on thermodynamic process and performance of a turbocharged direct-injection spark-ignition engine fuelled with ethanol and gasoline ," Applied Energy, Elsevier, vol. 228(C), pages 942-953.

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