Ethanol Kinetic Model Development and Validation at Wide Ranges of Mixture Temperatures, Pressures, and Equivalence Ratios

Abstract

A new detailed kinetic model of ethanol with 107 species and 1795 reactions was developed using a reaction mechanism generator and extensively validated against measured ignition delay times, laminar flame speeds, and time-resolved species concentrations. Ignition delay experiments were conducted at pressures of 15, 20, and 30 bar, a temperature range of 850−1000 K, and equivalence ratios of 0.5, 1.0, and 2.0 using an optically accessible rapid compression machine. The effect of oxygen concentration on the ignition delay at a fixed equivalence ratio was also measured and investigated using the new kinetic model. A high-speed camera was used to investigate the autoignition process and chemiluminescence emission at low-tointermediate temperatures. Different combustion behaviors with respect to the chemiluminescence color and intensity were identified and briefly explained. The new combustion kinetic model predicted the measured data from this work and those available in the literature quite well.

Measurement and Simulation of n-Heptane Mixture Autoignition

“…The gas pressure during the compression and post-compression periods is measured using a Kistler piezoelectric pressure transducer (6045B) paired with a Kistler charge amplifier (5018). The measured pressures with this setup have an uncertainty of 0.56%, which include uncertainty in measurements (0.42%), linearity (0.3%), and thermal shock error (0.2%), as discussed in previous works. ,− An uncertainty of approximately ±0.1 ms is associated with the timing of the end of compression (EOC).…”

“…This equation was used to determine the temperature during the compression and post-compression periods. The accuracy of this equation in calculating the gas temperature was discussed in previous works. , It should be noted that this equation assumes that no chemical reactions take place during compression (i.e., the chemistry is assumed to be frozen). However, this assumption may not be valid for a very short ignition delay (on the order of 1–3 ms).…”

A Batch Blending System for Continuous Production of Multi-Component Fuel Blends for Engine Laboratory Tests

“…Therefore, it is impossible to say if these results would be repeatable with other fuels and at other conditions. Moreover, other researchers has established that a much longer mixing time is needed to ensure fuel homogeneity from 120 min up to 7 hours [40,41]. If those results differs because of the mixing method applied, the difference in fuel composition and water content or the temperature conditions is hard to say but it confirms the need for evaluating the spread in density for this mixing system over a longer agitation time than 90 seconds.…”

Review of Oxidation of Gasoline Surrogates and Its Components

“…Studying the oxidation of ethanol is crucial in predicting gasoline combustion since approximately 10% of US gasoline by volume (E10) contains ethanol [21], as required by current US federal and state urban air quality standards [110]. With a RON/MON of 116.3/101.4, the combustion characteristics of ethanol have been studied extensively using low pressure shock tubes [111][112][113][114], high pressure shock tubes [115][116][117][118], RCMs [118][119][120][121], burners [113,114,122], turbulent flow reactors [113,114,123], and a JSR [114]. Kinetic models of ethanol have been studied and developed by [4,110,112,115,118,119,121,[123][124][125][126][127][128].…”

“…In addition, the combustion characteristics of mixtures of ethanol and gasoline were discussed by [124,129]. Zyada and Samimi [121] developed an ethanol kinetic model using an automated reaction mechanism generator (RMG) and validated the mechanism against measured ignition delay times, laminar flame speeds, and species concentrations data. The new mechanism simulated the combustion of ethanol very well.…”