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A New Optical Access for Medium Speed Large Bore Marine Engines under Full-Load Operating Conditions
Journal Article
03-14-06-0052
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Karmann, S., Kunkel, C., Prager, M., and Wachtmeister, G., "A New Optical Access for Medium Speed Large Bore Marine Engines under Full-Load Operating Conditions," SAE Int. J. Engines 14(6):867-883, 2021, https://doi.org/10.4271/03-14-06-0052.
Language:
English
Abstract:
The following work presents a new concept for optical accessibility of a
single-cylinder medium-speed large-bore marine engine from the concept
development to the implementation and feasibility investigation in a test bench
observing the flame chemiluminescence of dual-fuel (DF) combustion. The design’s
feasibility is verified using conjugated heat transfer (CHT) and finite element
method (FEM) simulation during the whole design process presented herein.
Assumptions made for the simulation, e.g., of the mount between the optical
component and the steel engine parts, are evaluated in pretesting setups
presented and described as follows. The optical access is made to withstand
steady-state full-load operating conditions and is proofed so. The optical
access is designed for an engine with a bore of 350 mm and a stroke of 440 mm.
With the presented approach, optical investigations like particle image
velocimetry (PIV), laser-induced fluorescence, and flame chemiluminescence in
the whole combustion chamber in a vertical field of view are possible. The
observation of the whole combustion chamber is realized via a quartz glass
window implemented as a cylindrical lens facing the combustion. With the
presented approach, the effectiveness of medium-speed large-bore engines could
be increased by investigating the influential factors for the limitations of the
combustion process like abnormal combustion as knocking and preignition caused
by, e.g., engine oil droplets, a bad charge distribution, or hot surfaces in the
combustion chamber.