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2024 Vol.29, Issue 3 Preview Page

Research Article

Ignition and Combustion Characteristics of Alternative Fuel under High-Temperature and High-Pressure Conditions

고온 고압 조건에서 대체 연료의 점화 및 연소특성에 관한 연구

Jiho Park1
,
Hyung Sub Sim12†
박 지호1
,
심 형섭12†
1Department of Aerospace Systems Engineering, Sejong University
2Department of Aerospace Engineering, Sejong University
1세종대학교 대학원 우주항공시스템공학과
2세종대학교 우주항공공학과
*Corresponding Author
30 September 2024. pp. 11-18
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Abstract

The ignition and combustion processes of alternative fuels need thorough understanding within a ‘beyond-RON’ regime, under temperature and pressure conditions relevant to compression-ignition engines, in contrast to their spark-ignition counterparts. This study investigates the low- and high-temperature ignition and combustion processes in high-pressure spray flames of primary reference fuel (PRF80) using simultaneous 50-kHz formaldehyde (CH2O) planar laser-induced fluorescence (PLIF) and 100-kHz schlieren imaging. The experiments are performed within a constant-volume pre-burn chamber, utilizing a highly convergent single-hole injector provided by the Engine Combustion Network (ECN), specifically Spray A-3. Simultaneous high-speed imaging diagnostics reveal the early cool flame formation and its evolution, the sequential consumption of formaldehyde, high-temperature ignition, and the formation of polycyclic aromatic hydrocarbons (PAHs) in high-pressure PRF80 spray flames. At lower temperatures, a gradual increase in pressure traces and apparent heat release rate (AHRR) indicates low-temperature heat release (LTHR), with numerous spikes observed before high-temperature ignition. The efficiency decreases compared to higher temperatures at the lowest tested temperature condition (899 K). The differences in low- and high-temperature ignition delay times decrease rapidly with increasing ambient temperature, both becoming shorter. Additionally, the flame lift-off length (FLOL) and CH2O inception distances shorten as the ambient temperatures rise.

Keywords
Alternative fuel
Primary reference fuel
Spray combustion
Planar laser-induced fluorescence
Advanced compression ignition
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Information
  • Publisher :The Korean Society of Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of the Korean Society of Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 29
  • No :3
  • Pages :11-18
  • Received Date : 2024-07-19
  • Revised Date : 2024-08-21
  • Accepted Date : 2024-08-23
  • DOI :https://doi.org/10.15231/jksc.2024.29.3.011
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