Combustion characteristics of n-heptane spray combustion in a low temperature reform gas/air environment

Shenghui Zhong, Shijie Xu, Xue-Song Bai, Ahmad Hadadpour, Mehdi Jangi, Fan Zhang, Qing Du, Zhijun Peng

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Abstract

This paper presents a large eddy simulation study of n-heptane spray combustion in an n-heptane low temperature reform (LTR) gas environment in a constant volume combustion chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) combustion engines. The LTR gas is made up of partially oxidized intermediate species from rich n-heptane/air mixture in an external constant temperature reformer. It is found that a higher reform temperature results in a longer ignition delay time of the n-heptane spray and a higher liftoff length, due to the chemical effect of the LTR gas and the difference in the reaction zone structures. A significantly different spray flame structure is identified in the RCCI case from that of single-fuel spray combustion. After the onset of high temperature ignition, a double-layer flame structure is established in the RCCI case, with a diffusion flame layer and a lean premixed flame layer. The lean premixed flame affects the flow field, which significantly suppresses the mixing around the spray tip. As a result, the RCCI case exhibits a lower NOx formation but a higher soot formation than the single-fuel case.
Original languageEnglish
Article number120377
JournalFuel
Volume293
Early online date26 Feb 2021
DOIs
Publication statusPublished - 1 Jun 2021

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