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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 and Weber, Stefan and Stürzl, Wolfgang and Prager, Maximilian and Jaensch, Malte and 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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Official URL: https://www.sae.org/publications/technical-papers/content/03-16-05-0036/


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.

Item URL in elib:https://elib.dlr.de/192188/
Document Type:Article
Title:Development of an Optical Investigation Method for Diesel and Oxymethylene Ether Spray in a Large-Bore Dual-Fuel Engine Using a Fisheye Optical System
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Karmann, Stephan BernhardTechnical University of MunichUNSPECIFIEDUNSPECIFIED
Stürzl, WolfgangUNSPECIFIEDhttps://orcid.org/0000-0003-2440-5857UNSPECIFIED
Prager, MaximilianTechnical University of MunichUNSPECIFIEDUNSPECIFIED
Jaensch, MalteTechnical University of MunichUNSPECIFIEDUNSPECIFIED
Wachtmeister, GeorgTechnical University of MunichUNSPECIFIEDUNSPECIFIED
Date:9 December 2023
Journal or Publication Title:SAE International Journal of Engines
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:Society of Automotive Engineers
Keywords:Fisheye optic, Lens distortion, Combustion engines, Dual-fuel combustion, Pilot fuel injection, OME
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Robotics
DLR - Research area:Raumfahrt
DLR - Program:R RO - Robotics
DLR - Research theme (Project):R - Multisensory World Modelling (RM) [RO]
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics (since 2013) > Perception and Cognition
Institute of Robotics and Mechatronics (since 2013)
Deposited By: Stürzl, Wolfgang
Deposited On:12 Dec 2022 20:09
Last Modified:18 Oct 2023 13:29

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