Effects of octane number and sensitivity on combustion of jet ignition engine
2022-01-0525
03/29/2022
- Event
- Content
- Octane number (ON) and octane sensitivity (OS), the fuel anti-konck indexes, are critical for the design of advanced jet ignition engines. In this study, twelve fuels with different research octane number (RON) and varying OS were formulated based on ethanol reference fuels (ERFs) to investigate effects of OS on combustion of jet ignition engine. The results indicated that jet ignition decreased ON demand of the fuel when compared with spark ignition. For jet ignition, the knocking intensity increased with the increase of OS under the same ON. For fuels with high and medium RON fuels (RON=100 and RON=92), a medium OS ranging from 3 to 5 was more favorable to achieve higher thermal efficiency. Though ignition delay and combustion duration decreased with the increase of OS, the combustion efficiency and the knocking intensity limited thermal efficiency of the fuel. The behavior of OS made little difference under stoichiometric and lean burn. For fuels with high OS (OS>7), coefficient of variation (COV) of the engine was lower when exhaust gas recirculation (EGR) was introduced, which was available higher EGR ratio. And higher OS fuel was a promising way to boost higher thermal efficiency of jet engine operating under stoichiometric combustion with ultra-high EGR dilution.
- Citation
- zhao, z., cai, k., wang, w., and Li, Y., "Effects of octane number and sensitivity on combustion of jet ignition engine," SAE Technical Paper 2022-01-0525, 2022, .