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Mixing due pulsating turbulent jets
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-7729-3484
2014 (English)In: Springer Proceedings in Physics, Springer, 2014, 159-163 p.Conference paper (Refereed)Text
Abstract [en]

Combustion efficiency and the formation of soot and/or NOx in Internal- Combustion engines depends strongly on the local air/fuel mixture, the local flow conditions and temperature. Modern diesel engines employ high injection pressure for improved atomization, but mixing is controlled largely by the flow in the cylinder. By injecting the fuel in pulses one can gain control over the atomization, evaporation and the mixing of the gaseous fuel. We show that the pulsatile injection of fuel enhances fuel break-up and the entrainment of ambient air into the fuel stream. The entrainment level depends on fuel property, such as fuel/air viscosity and density ratio, fuel surface-tension, injection speed and injection sequencing. Examples of enhanced break-up and mixing are given.

Place, publisher, year, edition, pages
Springer, 2014. 159-163 p.
Keyword [en]
Air engines, Air entrainment, Atomization, Combustion, Diesel engines, Engines, Fighter aircraft, Internal combustion engines, Mixing, Turbulence, Air/fuel mixtures, Combustion efficiencies, Density ratio, Fuel properties, High injection pressures, Injection speed, Local flow conditions, Turbulent jet, Fuels
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-181663DOI: 10.1007/978-3-319-01860-7_25ScopusID: 2-s2.0-84943236330ISBN: 9783319018591OAI: oai:DiVA.org:kth-181663DiVA: diva2:907744
Conference
5th iTi Conference in Turbulence, 2012, 25 April 2012 through 25 April 2012
Note

QC 20160229

Available from: 2016-02-29 Created: 2016-02-02 Last updated: 2016-02-29Bibliographically approved

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Nygård, Alexander
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