Integrated analysis of the scavenging process in marine two stroke ...

© 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) [email protected]

Integrated analysis of the scavenging process in marine two stroke diesel

engines

Project duration September 2011 - August 2014


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


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


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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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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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

© MAN Diesel & Turbo Integrated analysis of the scavenging process in marine two stroke diesel engines < 7 >

Some preliminary results

Cylinder pressure during scavenging

Temperature distribution during scavenging Scavenging: 125 – 277 CAD ATDC


Cylinder pressure during scavenging

Temperature distribution during scavenging

Some preliminary results

Scavenging: 125 – 277 CAD ATDC


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


Re = 51 013

DTU Swirl rig

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Mass flow within 2% of experiments


Velocity profiles

•Wake like profiles in axial direction

•Burgers vortex like profile

•Average in time only


Velocity profiles


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?

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