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Experimental study of a free piston linear alternator with an opposed piston combustion chamber

Heron-Himmel, Alex and Schneider, Stephan and Chiodi, Marco (2020) Experimental study of a free piston linear alternator with an opposed piston combustion chamber. In: 20. Internationales Stuttgarter Symposium Automobil- und Motorentechnik. Springer Vieweg. Internationale Stuttgarter Symposium, 17. - 18. März 2020, Stuttgart. ISBN 978-3-658-29942-2.

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This study focuses on the comparison of oil lubricated and dry lubricated pistons and there influence on the combustion process of free-piston engine with an opposed piston combustion chamber. The free-piston engine, which is developed by the German Aerospace Centre, works with a two-stroke principle and the dry lubrication is designed to eliminate the pollution caused by traditional oil lubrication in engines with scavenging ports. The introduction into opposed piston combustion, free piston engines and dry lubrica-tion is kept brief and is followed by a description of the test bench setup. The experi-mental results for a selection of operational points of both the oil and dry lubrication are compared. The key questions of the study are the influence regarding blow-by and possible impact on the combustion process. The observed differences are analysed and the initial assumptions discussed. The dry lubrication concept shows a reasonable in-dicated combustion efficiency of and the carbon piston rings are operated at a maximum frequency of 18.5 Hz. Some difficulties in the comparison need to be acknowledged which are based on the dry lubrication design. In combination with the results the dry lubrication concept is revised and the outlook adds suggestions towards future research.

Item URL in elib:https://elib.dlr.de/135298/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental study of a free piston linear alternator with an opposed piston combustion chamber
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Heron-Himmel, AlexAlex.Heron (at) dlr.dehttps://orcid.org/0000-0002-5341-6400
Schneider, StephanS.Schneider (at) dlr.dehttps://orcid.org/0000-0002-0792-7111
Chiodi, MarcoForschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart (FKFS)UNSPECIFIED
Date:17 March 2020
Journal or Publication Title:20. Internationales Stuttgarter Symposium Automobil- und Motorentechnik
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iD
Reuss, Hans-ChristianFKFSUNSPECIFIED
Publisher:Springer Vieweg
Keywords:Freikolben Gegenkolbenverbrennung
Event Title:Internationale Stuttgarter Symposium
Event Location:Stuttgart
Event Type:international Conference
Event Dates:17. - 18. März 2020
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:other
DLR - Research area:Transport
DLR - Program:V - no assignment
DLR - Research theme (Project):V - no assignment
Location: Stuttgart
Institutes and Institutions:Institute of Vehicle Concepts
Deposited By: Heron-Himmel, Alex
Deposited On:08 Jul 2020 15:35
Last Modified:08 Jul 2020 15:35

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