Post on 15-Dec-2016
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
DANSIS Research Seminar 2012
Fredrik H. Andersen Industrial Ph.D. student
Engine Process Research (LDF1) Fredrik.Andersen@man.eu
Integrated analysis of the scavenging process in marine two stroke diesel
engines
Project duration September 2011 - August 2014
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Industrial Ph.D. project founded by the Danish Angency for Science, Technology and Innovation (DASTI)
Organization
Section for Fluid Mechanics, Coastal and Maritime Engineering, DTU
Jens H. Walther, Ph.D.
Engine Process research (LDF1), MAN Diesel & Turbo CPH
Stefan Mayer, Ph.D.
Simon Matlok, Ph.D.
Karl-Johan Nogenmyr, Ph.D.
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Project description
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Investigate the scavenging process in marine two-stroke diesel engines
3D CFD model including moving piston and valve. Includes the asymmetry in inlet/outlet conditions
Input and validation data from the T50ME-X Engine at the Diesel research center Copenhagen
Close collaboration with the Ph.D. project of Kristian Mark Ingvorsen
Experimental data from the Swirl-rig at MEK-DTU
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Scope of study
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Power output: 8 MW
Cylinders: 4
Bore: 0.5 m
Stroke: 2.2 m
Speed: 123 RPM
Fuel consumption: 1.5 tons/h
Provides unique performance data, but is constantly mutating!
4T50ME-X Test engine
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© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
OpenFOAM 1.6-ext
Engine class from Politecnico di Milano
Mesh modifiers:
• Layer addition/removal
• Sliding interface
• GGI
Compressible
LES turbulence
Pressure driven
Parallel
T50ME-X Engine CFD model
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© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Time resolved quantities and cycle averages available from the test engine
In-house engine simulators
Cycsim
Hydcode
Initial conditions and boundaries
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Initial velocity at 125 CAD ATDC
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Some preliminary results
Cylinder pressure during scavenging
Temperature distribution during scavenging Scavenging: 125 – 277 CAD ATDC
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Cylinder pressure during scavenging
Temperature distribution during scavenging
Some preliminary results
Scavenging: 125 – 277 CAD ATDC
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Target Re = 50 000
Pressure driven
Large Eddy Simulation
DTU Swirl rig
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Approx 4.6M cells
20 cells across ports
Piso algorithm
© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines
Re = 51 013
DTU Swirl rig
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Mass flow within 2% of experiments
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Velocity profiles
•Wake like profiles in axial direction
•Burgers vortex like profile
•Average in time only
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Velocity profiles
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Velocity profiles
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All data provided in this document is non-binding. This data serves informational purposes only and is
especially not guaranteed in any way. Depending on the subsequent specific individual projects, the relevant
data may be subject to changes and will be assessed and determined individually for each project. This will depend on
the particular characteristics of each individual project, especially specific site and operational conditions.
Thank you for your attention! Questions?