Experimental study on knock suppression of spark-ignition engine fuelled with kerosene via water injection

Chenyao Wang, Fujun Zhang, Enhua Wang*, Chuncun Yu, Hongli Gao, Bolan Liu, Zhenfeng Zhao, Changlu Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

The four-stroke spark-ignition (SI) internal combustion engine has good fuel economy and high power/weight ratio, making it very suitable for small aircraft. Normally, four-stroke aviation SI engines are fuelled with gasoline. Using kerosene can improve the system safety; However, a four-stroke SI engine fuelled with kerosene suffers from a small indicated mean effective pressure (IMEP) because of the knock limit of kerosene. In this study, water injection is investigated as a method of extending the knock limitation and improving IMEP of a four-stroke SI engine fuelled with kerosene. First, a Rotax 914 engine is retrofitted. Two port-fuel-injection systems supplied with kerosene and water are developed. Then, the combustion characteristics with water injection are studied. The effects of water injection on the in-cylinder pressure and heat-release rate are analysed. Additionally, the extent of knock suppression due to water injection under various engine speeds is evaluated. The results indicate that the knock limit of the four-stroke SI engine with kerosene is extended significantly via water injection. The measured IMEP is improved by 25–28% under different engine speeds. Thus, the requirement for ordinary cruise operation is satisfied. Furthermore, the security is enhanced with water injection.

Original languageEnglish
Pages (from-to)248-259
Number of pages12
JournalApplied Energy
Volume242
DOIs
Publication statusPublished - 15 May 2019

Keywords

  • Aviation piston engine
  • Experimental study
  • Kerosene
  • Knock suppression
  • Water injection

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Wang, C., Zhang, F., Wang, E., Yu, C., Gao, H., Liu, B., Zhao, Z., & Zhao, C. (2019). Experimental study on knock suppression of spark-ignition engine fuelled with kerosene via water injection. Applied Energy, 242, 248-259. https://doi.org/10.1016/j.apenergy.2019.03.123