Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지

The Characteristics of Backfire for a Free-Piston Hydrogen Fueled Engine with Reverse Uni-flow Scavenging

Reverse uni-flow 소기방식을 갖는 2행정 프리피스톤 수소기관의 역화 현상에 관한 연구

  • Received : 2010.02.21
  • Accepted : 2010.04.20
  • Published : 2010.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

In order to develop two-stroke free-piston hydrogen engine to obtain high thermal efficiency and low emission, backfire occurrence have to be prevented. In this research, backfire characteristics are analyzed as functions of the intake valve opening timing and compression chamber pressure under piston by using RICEM (Rapid Intake Compression Expansion Machine) that has reverse uni-flow scavenging. As the result, reverse uni-flow scavenging is advantage about back fire. but, it exists suitable intake valve opening timing and its timing become known that equivalence ratio 1 retard until the piston rises. Also, To rise chamber pressure of lower piston, this does not cause backfire occurs in equivalent ratio 0.6 observed back fire. Therefore, 2cycle hydrogen fueled free-piston engine is undesirable scavenging compression by compressing the piston.

Keywords

References

  1. R. Mikalsen, A. P. Roskilly, "A review of free-piston history and applications", Appl. Therm. Eng., Vol. 27, 2007, pp. 2339-2352. https://doi.org/10.1016/j.applthermaleng.2007.03.015
  2. R. Mikalsen, A. P. Roskilly, "Performance simulation of spark ignite free-piston engine generator", Appl. Therm. Eng, 2008.
  3. Jakob Fredriksson, Ingemar Denbratt, "Simulation of a Two-Stroke Free Piston Engine", SAE Paper NO. 2004-01-1871, 2004.
  4. G. P., Blair, "Correlation of Theory and Experiment for Scavenging Flow in Two-Stroke Cycle Engine", SAE Paper NO. 88125, 1988.
  5. H. W. Cho, J. S. Yoon, J. T. lee, H. S. Lim, "Flow visualization used PIV of hydrogen fueled free piston engine with uni-flow scavenging", Trans. of the KHNES, Vol. 19, No. 3, 2008, pp. 182-188.
  6. K. C. Noh, J. S. Yoon, S. W. Park, J. T. Lee, H. S. Lim, "A study on the Performance Improvement in the Hydrogen fueled Free-piston Engine", Proceeding of the KSAE Annual Spring Meeting 2006, Vol. 1, pp. 1872-1877.
  7. K. Y. Cho, C. H. Byun, J. T. Lee, "The characteristics of backfire for a hydrogen fueled free-piston engine with reverse uniflow scavenging", Proceeding of the KSAE Annual Autumn Meeting 2009.
  8. H. W. Cho, K. Y. Cho, J. T. Lee, "Flow characteristics in a hydrogen fueled free piston engine with reverse uniflow scavenging", Proceeding of the KSAE Annual Autumn Meeting 2008.