A Shock Tube Study ofn- andiso-Propanol Ignition

Abstract

An understanding of the ignition and oxidation characteristics of propanol, as well as other alcohols, is important toward the development and design of combustion engines that can effectively utilize bioderived and bioblended fuels. Building upon a database for “first-generation” alcohols including methanol and ethanol, the ignition characteristics of the two isomers of propanol (n-propanol and iso-propanol) have been studied in a shock tube. Ignition delay times for propanol/oxygen/argon mixtures have been measured behind reflected shock waves at temperatures ranging from approximately 1350 to 2000 K and a pressure of 1 atm. Equivalence ratios of 0.5, 1.0, and 2.0 have been used. Pressure measurements and CH* emissions were used to determine ignition delay times. The influences of equivalence ratio, temperature, and mixture strength on ignition delay have been characterized and compared to the behavior seen with a newly developed detailed kinetic mechanism. The overall trends are captured fairly well by the mechanism, which include a greater level of reactivity for the n-propanol mixtures relative to iso-propanol at the conditions used in this study.

Kinetic modeling of gasoline surrogate components and mixtures under engine conditions

“…The chemistry of the small alcohols was analyzed and some reaction rates were updated on the basis of recent quantum mechanical calculations [5]. The abstraction reactions of HO 2 and CH 3 O 2 radicals…”

“…One significant improvement is the achievement of the full thermodynamic consistency between the forward and reverse reactions included in the mechanism core. Further details on this section of the mechanism are available in [5][6]. These improvements significantly impacted flame speed predictions and ignition behavior in the high temperature region (1000K-1400K).…”

An analysis of spray development with iso-octane, n-pentane, gasoline, ethanol and n-butanol from a multi-hole injector under hot fuel conditions

“…With regards to other alcohols, it may be noted that the demand and cost for Propanol is driven mainly by its use as a solvent and that currently it is not commonly considered as a future fuel. However, some studies have started to emerge recently on the fundamental combustion properties of Propanol and its isomers [6,7].…”

Autoignition behavior of unsaturated hydrocarbons in the low and high temperature regions

“…The mechanism is based on a C 1 -C 4 detailed core detailed mechanism which has been recently improved by Curran and coworkers [23][24]. On the top of this model, different modules have been built accounting for different cases of compounds: linear, branched and aromatic hydrocarbons.…”