Investigation of combustion characteristics of primary reference fuels in heated microchannels

Document Type

Conference Proceeding

Publication Date

1-1-2018

Abstract

In this study, combustion characteristics of Primary Reference Fuels (PRFs: n-heptane/iso-octane mixtures) are investigated at atmospheric and moderate pressure in a microchannel exposed to a controlled temperature profile produced by a flat flame burner. Tests with stoichiometric PRF/air mixtures are carried out with inlet velocities ranging from 5 to 80 cms-1. Three distinct combustion regimes are observed: weak flames, flames with repetitive extinction and ignition (FREI), and strong flames. Chemiluminescence from excited CH∗radicals is captured by a machine vision camera at each set point. Photographic images of the observed flame structures are processed to identify flame position as well as locations where ignition and extinction occur. The temperature at which each flame structure is observed is obtained in terms of the measured wall temperature profile since both are related to axial position. Results for different fuel blends are compared showing that ignition and extinction temperatures of fuels are affected by the octane number, which is consistent with weak flame results from the literature.

Publication Source (Journal or Book title)

2018 Spring Technical Meeting of the Western States Section of the Combustion Institute, WSSCI 2018

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