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Design of an innovative natural gas two-stroke engine

Title data

Diwisch, Pascal ; Dinkel, Christian ; Rieg, Frank ; Alber-Laukant, Bettina:
Design of an innovative natural gas two-stroke engine.
In: Marjanović, Dorian ; Pavković, Neven (ed.): Design 2016 - excellence in design. Band 2. Tools, practice & innovation. - Zagreb : Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb , 2016 . - pp. 811-820

Abstract in another language

Eine große Herausforderung für die heutige Verwendung von Zweitaktmotoren stellen die Abgasemissionen dar. Grund dafür sind vor allem unverbrannte Kohlenwasserstoffe, erzeugt durch Kurzschlussströmungen und Fehlzündungen im Teillastbereich. Die Entwicklung eines neuartigen Konzeptes auf Basis des bekannten Doppelkolbenprinzips am Lehrstuhl für Konstruktionslehre und CAD der Universität Bayreuth kombiniert mit einem geeigneten Einspritzsystem soll die Entstehung unverbrannter Kohlenwasserstoffe verhindern. Methodisches Vorgehen der Entwicklung zusammen mit dem Einsatz moderner CAx-Systeme führen zu einer Schrittweisen Optimierung des Motors. Dieses Vorgehen wird beispielhaft für den Zylinderkopf gezeigt.

Abstract in another language

High-speed two-stroke engines in the field of small hand-operated devices, Jet Skis, snowmobiles,
motorboats and ultralight aircrafts have a large market share. In Asia, two-stroke engines are
predominantly applied in motorcycles [Meinig 2001]. Due to rising demand on exhaust emissions, twostroke
engines are less and less employed despite considerable advantages. In contrast to four-stroke
engines, two-stroke engines fire at each crankshaft revolution. Thus, besides a more even progression
of torque a bisection of the mean effective pressure is achieved. As a result, higher power density as
well as minor construction volume can be obtained. Concerning the prospective usage of two-stroke
engines the progress in adherence to emission standards will be decisive. This would also enable the
development of further areas of application. Hence, possible applications of two-stroke engines include
the usage as a range extender in electric vehicles to increase their range and customer acceptance as well
as the usage in combined heat and power stations (CHP). Therefore, the Chair for Engineering Design
and CAD, under the direction of Prof. Dr.-Ing. Rieg at the University of Bayreuth, focuses on the
constructive improvement of scavenging caused fuel consumption and thus hydrocarbon exhaust
emissions concerning two-stroke engines. The realization consists of two phases. During the first stage
the selection of a suitable concept for a two-stroke engine takes place. Within the second phase several
existing computer-aided technologies are combined through “intelligent cross-linked simulation”
(ICROS). Since the development of a two-stroke engine includes elaborate simulations of both
thermofluid dynamics and combustion, ICROS has to be combined with a validation method. The
response and integration of information, gained by the validation method, into the iterative process leads
to an extended ICROS method which will be introduced in the following chapters on the basis of the
cylinder head of a two-stroke engine. This leads to a faster and more economical product development
process of essential parts for an innovative two-stroke engine with substantially high efficiency and
reduced exhaust emissions of hydrocarbon.

Further data

Item Type: Article in a book
Refereed: Yes
Additional notes: ISSN 1847-9073 der Serie
Keywords: FEA; CFD; Doppelkolbenmotor; split-single two-stroke engine; CFD; FEM; simulation;
exhaust emission
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD
Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties > Faculty of Engineering Science
Research Institutions
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Oct 2016 10:26
Last Modified: 16 Jan 2018 13:28
URI: https://eref.uni-bayreuth.de/id/eprint/34858