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Analysis of SI and HCCI Combustion in a Two-Stroke Opposed-Piston Free-Piston Engine

Schneider, Stephan and Friedrich, Horst and Chiodi, Marco and Bargende, Michael (2017) Analysis of SI and HCCI Combustion in a Two-Stroke Opposed-Piston Free-Piston Engine. Small Engines Technology Conference SETC 2017, 15.-17.11.2017, Jakarta, Indonesien.

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Official URL: http://papers.sae.org/2017-32-0037/


The German Aerospace Center (DLR) is developing a free-piston engine as an innovative internal combustion engine for the generation of electrical power. The arrangement of the Free Piston Linear Generator (FPLG) in opposed-piston design consists of two piston units oscillating freely, thereby alternately compressing the common combustion chamber in the center of the unit and gas springs on either side. Linear alternators convert the kinetic energy of the moving pistons into electric energy. Since the pistons are not mechanically coupled to a crank train, the bottom and top dead centers of the piston movement can be varied during operation e.g. to adjust the compression ratio. Utilizing these degrees of freedom, the present paper deals with the analysis of different combustion processes in a port scavenged opposed-piston combustion chamber prototype. This contains the experimental investigation of spark ignition (SI) as well as the transition to homogeneous charge compression ignition (HCCI). Based on test bench results, a 3D-CFD model, which has been used to develop the first prototype, is calibrated by actual measurements. The simulation results enable a deeper analysis of scavenging and in-cylinder processes exceeding the measurement possibilities on a test bench.

Item URL in elib:https://elib.dlr.de/116552/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of SI and HCCI Combustion in a Two-Stroke Opposed-Piston Free-Piston Engine
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schneider, Stephans.schneider (at) dlr.dehttps://orcid.org/0000-0002-0792-7111
Friedrich, Horsthorst.friedrich (at) dlr.deUNSPECIFIED
Chiodi, Marcoforschungsinstitut für kraftfahrwesen und fahrzeugmotoren stuttgart (fkfs)UNSPECIFIED
Bargende, Michaelforschungsinstitut für kraftfahrwesen und fahrzeugmotoren stuttgart (fkfs)UNSPECIFIED
Date:November 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:spark ignition engines, two-stroke engines, HCCI engines, combustion and combustion processes
Event Title:Small Engines Technology Conference SETC 2017
Event Location:Jakarta, Indonesien
Event Type:international Conference
Event Dates:15.-17.11.2017
Organizer:JSAE und SAE international
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 > Alternative Energiewandler
Deposited By: Schneider, Stephan
Deposited On:09 Jan 2018 15:51
Last Modified:09 Jan 2018 15:51

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