Understanding the impact of heat of vaporization on ɸ-sensitivity of toluene & ethanol reference fuels
2022-01-0618
03/29/2022
- Event
- Content
- The low-temperature combustion (LTC) concept as a basis for high-efficiency, low-emission combustion technologies is getting more attentions among researchers and automotive industries. The modern engines which are working based on the (LTC) concept have specific fuel requirements. Fuel ɸ-sensitivity is a key factor to be considered for tailoring fuels for these engines. Fuel with high ɸ-sensitivity are more responsive to fuel or thermal stratifications, since the auto-ignition properties of different air-fuel mixtures of these fuels, with different equivalence ratio (ɸ) are more diverse. This diversity provide a smoother heat release rate in stratified condition. In this study a modified Cooperative Fuel Research (CFR) engine for homogeneous-charge compression ignition (HCCI) combustion is used to investigate the pressure sensitivity of 12 different toluene–ethanol reference fuels (TERFs) in three research octane number (RON) groups of 63, 84, and105. In this study, the effect of sweep in phi on ɸ-sensitivity and different combustion and emission parameters of TERFs is evaluated. This evaluation is performed at two intake temperature of 100 and 150 °C and the results are compared with the outcome of the Lund ɸ-sensitivity number with the intake temperature of 50°C. This study shows that the pressure sensitivity response of different blends with different compositions and therefore different heat of vaporizations (HOV) to the variation of intake charge temperature differs. It shows that the fuel ɸ-sensitivity will vary under different thermodynamic conditions. Fuel’s HOV is one the fuel properties that significantly affects this behavior.
- Citation
- Alemahdi, N., Garcia, A., Boufaim, E., Aferiatd, G. et al., "Understanding the impact of heat of vaporization on ɸ-sensitivity of toluene & ethanol reference fuels," SAE Technical Paper 2022-01-0618, 2022, .