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The effects of spark timing, unburned gas temperature, and negative valve overlap on the rates of stoichiometric spark assisted compression ignition combustion

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  • Olesky, Laura Manofsky
  • Martz, Jason B.
  • Lavoie, George A.
  • Vavra, Jiri
  • Assanis, Dennis N.
  • Babajimopoulos, Aristotelis

Abstract

Spark assisted compression ignition (SACI) combustion is a potential means of extending the high load limit of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. In these experiments, an HCCI engine equipped with fully-flexible valve actuation was used to explore the effect of spark assist in controlling peak heat release rates. Fueling rate was held constant at 19mg/cycle with a net indicated mean effective pressure (IMEPn) of ∼6.5bar. The fraction of flame heat release was varied from 18% to 34% by controlling spark timing and unburned gas temperature (Tu) via changes in internal and external exhaust gas recirculation (EGR). Internal EGR was adjusted by varying the duration of negative valve overlap (NVO). This strategy also allowed mixture composition and equivalence ratio (ϕ=1.0) to be maintained. It was found that combustion phasing (CA50) could be held constant while reducing peak heat release rates by ∼40% and ringing intensity by ∼75% with no penalty in thermal efficiency. Heat release analysis showed that the effects of SACI were consistent with changes in estimated laminar flame speed near the time of spark and a relatively constant temperature at the onset of end-gas auto-ignition. For the range of NVO investigated, potential variations in thermal and compositional stratification were found to have a weak effect on burn characteristics, affirming that temperature and spark timing were the primary variables affecting SACI burn rates under the conditions studied.

Suggested Citation

  • Olesky, Laura Manofsky & Martz, Jason B. & Lavoie, George A. & Vavra, Jiri & Assanis, Dennis N. & Babajimopoulos, Aristotelis, 2013. "The effects of spark timing, unburned gas temperature, and negative valve overlap on the rates of stoichiometric spark assisted compression ignition combustion," Applied Energy, Elsevier, vol. 105(C), pages 407-417.
    • Handle: RePEc:eee:appene:v:105:y:2013:i:c:p:407-417
    DOI: 10.1016/j.apenergy.2013.01.038
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    References listed on IDEAS

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    1. Xie, Hui & Li, Le & Chen, Tao & Yu, Weifei & Wang, Xinyan & Zhao, Hua, 2013. "Study on spark assisted compression ignition (SACI) combustion with positive valve overlap at medium–high load," Applied Energy, Elsevier, vol. 101(C), pages 622-633.
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    1. Bahri, Bahram & Shahbakhti, Mahdi & Aziz, Azhar Abdul, 2017. "Real-time modeling of ringing in HCCI engines using artificial neural networks," Energy, Elsevier, vol. 125(C), pages 509-518.
    2. Chen, Tao & Xie, Hui & Li, Le & Zhang, Lianfang & Wang, Xinyan & Zhao, Hua, 2014. "Methods to achieve HCCI/CAI combustion at idle operation in a 4VVAS gasoline engine," Applied Energy, Elsevier, vol. 116(C), pages 41-51.
    3. Abdullah U. Bajwa & Felix C. P. Leach & Martin H. Davy, 2023. "Prospects of Controlled Auto-Ignition Based Thermal Propulsion Units for Modern Gasoline Vehicles," Energies, MDPI, vol. 16(9), pages 1-45, May.
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    5. Salvi, B.L. & Subramanian, K.A., 2015. "Experimental investigation and phenomenological model development of flame kernel growth rate in a gasoline fuelled spark ignition engine," Applied Energy, Elsevier, vol. 139(C), pages 93-103.
    6. Liu, Shang & Lin, Zhelong & Zhang, Hao & Lei, Nuo & Qi, Yunliang & Wang, Zhi, 2023. "Impact of ammonia addition on knock resistance and combustion performance in a gasoline engine with high compression ratio," Energy, Elsevier, vol. 262(PA).
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    8. Song, Kang & Wang, Xinyan & Xie, Hui, 2018. "Trade-off on fuel economy, knock, and combustion stability for a stratified flame-ignited gasoline engine," Applied Energy, Elsevier, vol. 220(C), pages 437-446.
    9. Chen, Lin & Zhang, Ren & Pan, Jiaying & Wei, Haiqiao, 2020. "Effects of partitioned fuel distribution on auto-ignition and knocking under spark assisted compression ignition conditions," Applied Energy, Elsevier, vol. 260(C).
    10. Yang, Hongqiang & Wang, Zhi & Shuai, Shijin & Wang, Jianxin & Xu, Hongming & Wang, Buyu, 2015. "Temporally and spatially distributed combustion in low-octane gasoline multiple premixed compression ignition mode," Applied Energy, Elsevier, vol. 150(C), pages 150-160.
    11. Pachiannan, Tamilselvan & Zhong, Wenjun & Rajkumar, Sundararajan & He, Zhixia & Leng, Xianying & Wang, Qian, 2019. "A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    12. Fagundez, J.L.S. & Lanzanova, T.D.M. & Martins, M.E.S. & Salau, N.P.G., 2020. "Joint use of artificial neural networks and particle swarm optimization to determine optimal performance of an ethanol SI engine operating with negative valve overlap strategy," Energy, Elsevier, vol. 204(C).
    13. Ortiz-Soto, Elliott A. & Lavoie, George A. & Martz, Jason B. & Wooldridge, Margaret S. & Assanis, Dennis N., 2014. "Enhanced heat release analysis for advanced multi-mode combustion engine experiments," Applied Energy, Elsevier, vol. 136(C), pages 465-479.
    14. Rami Y. Dahham & Haiqiao Wei & Jiaying Pan, 2022. "Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges," Energies, MDPI, vol. 15(17), pages 1-60, August.
    15. Liu, Shang & Lin, Zhelong & Zhang, Hao & Fan, Qinhao & Lei, Nuo & Wang, Zhi, 2023. "Experimental study on combustion and emission characteristics of ethanol-gasoline blends in a high compression ratio SI engine," Energy, Elsevier, vol. 274(C).
    16. Zhou, Lei & Song, Yuntong & Hua, Jianxiong & Liu, Fengnian & Wei, Haiqiao, 2020. "Effects of miller cycle strategies on combustion characteristics and knock resistance in a spark assisted compression ignition (SACI) engine," Energy, Elsevier, vol. 206(C).
    17. Zhou, Lei & Hua, Jianxiong & Wei, Haiqiao & Dong, Kai & Feng, Dengquan & Shu, Gequn, 2018. "Knock characteristics and combustion regime diagrams of multiple combustion modes based on experimental investigations," Applied Energy, Elsevier, vol. 229(C), pages 31-41.
    18. Andwari, Amin Mahmoudzadeh & Aziz, Azhar Abdul & Said, Mohd Farid Muhamad & Latiff, Zulkarnain Abdul, 2014. "Experimental investigation of the influence of internal and external EGR on the combustion characteristics of a controlled auto-ignition two-stroke cycle engine," Applied Energy, Elsevier, vol. 134(C), pages 1-10.
    19. Bahri, Bahram & Shahbakhti, Mahdi & Kannan, Kaushik & Aziz, Azhar Abdul, 2016. "Identification of ringing operation for low temperature combustion engines," Applied Energy, Elsevier, vol. 171(C), pages 142-152.
    20. Wang, Xinyan & Zhao, Hua & Xie, Hui, 2016. "Effect of dilution strategies and direct injection ratios on stratified flame ignition (SFI) hybrid combustion in a PFI/DI gasoline engine," Applied Energy, Elsevier, vol. 165(C), pages 801-814.
    21. Fan, Qinhao & Liu, Shang & Qi, Yunliang & Cai, Kaiyuan & Wang, Zhi, 2021. "Investigation into ethanol effects on combustion and particle number emissions in a spark-ignition to compression-ignition (SICI) engine," Energy, Elsevier, vol. 233(C).
    22. Olesky, Laura Manofsky & Lavoie, George A. & Assanis, Dennis N. & Wooldridge, Margaret S. & Martz, Jason B., 2014. "The effects of diluent composition on the rates of HCCI and spark assisted compression ignition combustion," Applied Energy, Elsevier, vol. 124(C), pages 186-198.

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