The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine

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Details zur Publikation

Autorinnen und Autoren: Storch M, Hinrichsen F, Wensing M, Will S, Zigan L
Zeitschrift: Applied Energy
Verlag: Elsevier
Jahr der Veröffentlichung: 2015
Band: 156
Seitenbereich: 783-792
ISSN: 0306-2619


Abstract


In various research studies, ethanol blended fuels have shown reduced particulate matter (PM) emissions in comparison to gasoline and its surrogate fuels in direct-injection spark-ignition (DISI) engines. However, there are also studies reporting increased particulate concentration for fuels with low ethanol content. In this work the mixture formation and sooting combustion behavior of isooctane and the mixture E20 (20 vol% of ethanol in isooctane) is analyzed for catalyst heating operation. These operating conditions are critical as they strongly contribute to overall soot emissions in driving cycles. Simultaneous high speed imaging of OH*-chemiluminescence and natural soot luminosity measurements are performed in combination with primary particle concentration measurements using a laser induced incandescence (LII) sensor in the engine exhaust duct. At these operating conditions E20 exhibits a higher sooting tendency as compared to isooctane. In order to identify the reason for increased soot formation, the mixture formation process is analyzed by planar laser induced fluorescence (LIF) measurements. The results show that soot was formed in fuel rich regions with incomplete evaporated fuel droplets remaining from the injection event. A different evaporation process of E20 fuel spray and mixing behavior is indicated showing a more compact rich mixture cloud with surrounding lean areas near the spark plug region. This mixture stratification is characterized by higher cyclic variations and constitutes a significant source of soot formation. (C) 2015 Elsevier Ltd. All rights reserved.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Hinrichsen, Florian
Lehrstuhl für Technische Thermodynamik
Storch, Michael
Lehrstuhl für Technische Thermodynamik
Wensing, Michael Prof. Dr.-Ing.
Professur für Technische Thermodynamik
Will, Stefan Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik
Zigan, Lars PD Dr. habil.
Lehrstuhl für Technische Thermodynamik


Zitierweisen

APA:
Storch, M., Hinrichsen, F., Wensing, M., Will, S., & Zigan, L. (2015). The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine. Applied Energy, 156, 783-792. https://dx.doi.org/10.1016/j.apenergy.2015.06.030

MLA:
Storch, Michael, et al. "The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine." Applied Energy 156 (2015): 783-792.

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Zuletzt aktualisiert 2018-02-07 um 09:23