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Development of an Optical Investigation Method for Diesel and Oxymethylene Ether Spray in a Large-Bore Dual-Fuel Engine Using a Fisheye Optical System

Karmann, Stephan Bernhard und Weber, Stefan und Stürzl, Wolfgang und Prager, Maximilian und Jaensch, Malte und Wachtmeister, Georg (2023) Development of an Optical Investigation Method for Diesel and Oxymethylene Ether Spray in a Large-Bore Dual-Fuel Engine Using a Fisheye Optical System. SAE International Journal of Engines, 16 (5). Society of Automotive Engineers. doi: 10.4271/03-16-05-0036. ISSN 1946-3936.

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Offizielle URL: https://www.sae.org/publications/technical-papers/content/03-16-05-0036/

Kurzfassung

Optical combustion phenomena investigation is a common tool for passenger car and automotive engines. Large-bore engines for stationary and mobile applications, on the other hand, have a lower optical examination density. This is mainly due to the technically more complex design of the optical accesses that have to provide a larger field of view and withstand high mechanical and thermal loads. Nevertheless, an optical investigation of in-cylinder phenomena in large-bore engines is essential to optimize efficient and environmentally friendly combustion processes using new sustainable e-fuels. To realize a simple optical access with maximum observability of the combustion chamber, a fisheye optic for the direct integration into internal combustion engines was developed and used for in-cylinder Mie-scattering investigations of diesel and Oxymethylene Ether (OME3-5) pilot fuel spray of natural gas dual-fuel combustion processes in a MAN 35/44DF single-cylinder research engine. As this special application of a fisheye lens poses some technical challenges, a special image processing procedure is necessary for result evaluation. This innovative postprocessing of the fisheye images comprises a calibration of the fisheye optic and a virtual three-dimensional (3D) re-projection method. Investigations prove the accuracy of the method to be within 2.1 mm. To prove the advantage of the method, optical spray investigations of two different fuels using Mie-scattering in the skipped-fire optical accessible medium-speed large-bore engine are carried out under realistic engine conditions. With the newly developed post-processing procedure, it was possible to derive the mean liquid penetration depth of the in situ investigations. Further, the post-processing includes a rectification of the fisheye images to improve the observability of the pilot fuel spray in the fired combustion engine. The analysis reveals a more compact and dense spray for OME3-5 compared to marine diesel fuel (DMA) as well as about 39% reduced liquid penetration length.

elib-URL des Eintrags:https://elib.dlr.de/192188/
Dokumentart:Zeitschriftenbeitrag
Titel:Development of an Optical Investigation Method for Diesel and Oxymethylene Ether Spray in a Large-Bore Dual-Fuel Engine Using a Fisheye Optical System
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Karmann, Stephan BernhardTechnical University of MunichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Weber, StefanMAN Energy SolutionsNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stürzl, WolfgangWolfgang.Stuerzl (at) dlr.dehttps://orcid.org/0000-0003-2440-5857NICHT SPEZIFIZIERT
Prager, MaximilianTechnical University of MunichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Jaensch, MalteTechnical University of MunichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wachtmeister, GeorgTechnical University of MunichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:9 Dezember 2023
Erschienen in:SAE International Journal of Engines
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:16
DOI:10.4271/03-16-05-0036
Verlag:Society of Automotive Engineers
ISSN:1946-3936
Status:veröffentlicht
Stichwörter:Fisheye optic, Lens distortion, Combustion engines, Dual-fuel combustion, Pilot fuel injection, OME
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Robotik
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RO - Robotik
DLR - Teilgebiet (Projekt, Vorhaben):R - Multisensorielle Weltmodellierung (RM) [RO]
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Robotik und Mechatronik (ab 2013) > Perzeption und Kognition
Institut für Robotik und Mechatronik (ab 2013)
Hinterlegt von: Stürzl, Wolfgang
Hinterlegt am:12 Dez 2022 20:09
Letzte Änderung:18 Okt 2023 13:29

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