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research-article

EFFECTS OF FUEL QUANTITY ON SOOT FORMATION PROCESS FOR BIOMASS-BASED RENEWABLE DIESEL FUEL COMBUSTION

[+] Author and Article Information
Wei Jing

North Carolina State University Raleigh, NC, USA
wjing2@ncsu.edu

Zengyang Wu

North Carolina State University Raleigh, NC, USA
zwu7@ncsu.edu

William Roberts

King Abdullah University of Science and Technology Thuwal, Saudi Arabia
william.roberts@kaust.edu.sa

Tiegang Fang

North Carolina State University Raleigh, NC, USA
tfang2@ncsu.edu

1Corresponding author.

ASME doi:10.1115/1.4036292 History: Received February 14, 2017; Revised March 05, 2017

Abstract

Soot formation process was investigated for biomass-based renewable diesel fuel, such as biomass to liquid (BTL), and conventional diesel combustion under varied fuel quantities injected into a constant volume combustion chamber. Soot measurement was implemented by two-color pyrometry under quiescent type diesel engine conditions (1000 K and 21% O2 concentration). Different fuel quantities, which correspond to different injection widths from 0.5 ms to 2 ms under constant injection pressure (1000 bar), were used to simulate different loads in engines. For a given fuel, soot temperature and KL factor show a different trend at initial stage for different fuel quantities, where a higher soot temperature can be found in a small fuel quantity case but a higher KL factor is observed in a large fuel quantity case generally. Another difference occurs at the end of combustion due to the termination of fuel injection. Additionally, BTL flame has a lower soot temperature, especially under a larger fuel quantity (2 ms injection width). Meanwhile, average soot level is lower for BTL flame, especially under a lower fuel quantity (0.5 ms injection width). BTL shows an overall low sooting behavior with low soot temperature compared to diesel, however, trade-off between soot level and soot temperature needs to be carefully selected when different loads are used.

Copyright (c) 2017 by ASME
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