Autoignition behavior of synthetic alternative jet fuels: An examination of chemical composition effects on ignition delays at low to intermediate temperatures

Authors

Daniel Valco, University of Illinois at Urbana-Champaign
Gerald Gentz, Michigan State University
Casey Allen, Marquette University
Meredith Colket, United Technologies Research Center
Tim Edwards, Wright-Patterson Air Force Base
Sandeep Gowdagiri, Rensselaer Polytechnic Institute
Matthew A. Oehlschlaeger, Rensselaer Polytechnic Institute
Elisa Toulson, Michigan State University
Tonghun Lee, University of Illinois at Urbana-ChampaignFollow

Document Type

Article

Date of this Version

2015

Citation

Proceedings of the Combustion Institute 35 (2015)

Comments

U S. Government work.

Abstract

The autoignition characteristics of military aviation fuels (JP-5 and JP-8), proposed camelina-derived hydroprocessed renewable jet fuel replacements (HRJ-8 and HRJ-5), Fischer–Tropsch fuels (Shell and Sasol), three Sasol isoparaffinic solvents, as well as 50/50 volumetric blends of the alternative fuels with the conventional fuels are examined. Experiments were conducted in a rapid compression machine and shock tube at compressed temperatures of 625 K ≤ Tc ≤ 1000 K, a compressed pressure of 20 bar, and under stoichiometric and lean conditions. Several implicit properties of the alternative fuels prompted a study of the influence of chemical composition on autoignition, including the influence of isoparaffinic, cycloparaffinic, and aromatic structures. In addition, interesting combustion phenomena at low-temperature conditions are investigated under lean conditions, specifically concerning jet fuel blend reactivity, where a convergence in blend reactivity to the reactivity of either a conventional or alternative fuel is observed.