DCMT - Den Danske Maritime Fond

DCMT
14
− 12 th internal DCAMM Symposium, 23-25 March 2009, Denmark.
− 24 th International Workshop on Water Waves and Floating Bodies, 19-22 April 2009,
Saint-Petersburg, Russia.
− 29 th International Conference on Ocean, Offshore and Arctic Engineering, 6-11 June
2010, Shanghai, China (ABSTRACT ACCEPTED)
− Presentation at the STS meeting on 2nd November 2009.
Soizic Joncquez:
“DCMT has allowed me to do a PhD thesis that had both a research aspect as well as a
practical aspect (for the industry). It helped me to validate my numerical results with
experimental data from a real ship.”
Michael Højsholm Schmidt, Schmidt Marine (tidligere ansat hos Grontmij):
“Based on my long experience with design of ships the propulsive performance in a seaway is
highly relevant – but often very little concern is made to this issue. Therefore, it is very
interesting for ship designers and operators with advanced tools for fast and efficient
calculation of added resistance in a seaway. I am really looking forward to see the final
conclusions on his project, and I trust that the knowledge developed in this project will be very
important for the industry.”
6.8 Swirl in 2-stroke diesel engines
I dette PhD projekt har Sajjad Haider udført et imponerende og omfangsrigt studie af swirlprocessen
i en cylinder på en totaktsmotor. Ved at kende swirl-processen i detaljer forventes det,
at det er muligt at optimere forbrændingsprocessen og dermed optimere den termiske
virkningsgrad og evt. reducere emissioner. I projektet har Sajjad lavet en avanceret og
omfattende CFD beregningsmodel (Computational Fluid Dynamics) til beregning af swirl i
cylinderen. Sajjad har også gennemført en eksperimentel undersøgelse af en simplificeret fysisk
model af en cylinder ved hjælp af avancerede PIV-målinger. Resultater fra simuleringer er
sammenlignet med eksperimentelle resultater for at evaluere simuleringerne i forhold til de
faktiske strømningsforhold i cylinderen.
Det er et yderst omfattende arbejde Sajjad har udført – både eksperimentelt og numerisk, og
Sajjad har publiceret to videnskabelige artikler på højt niveau. Resultaterne er dokumenteret i
Sajjads PhD afhandling. På trods af de gode resultater kræves der dog yderligere studier og
yderligere udvikling af CFD metoderne for at bestemme swirl-processen med stor nøjagtighed.
Referencerne inkluderer:
− S. Haider;T. Schnipper;A. Obeidat;K. E. Meyer;V. L. Okulov;S. Mayer;Jens
HonoreWalther: “PIV Study of the Effect of Piston Position on the In-Cylinder Swirling
Flow During the Scavenging Process in Large Two-Stroke Marine Diesel Engines”,
accepted for publication in Journal of Marine Science and Technology (2012)
− Haider Sajjad, Meyer Knud E., Schramm Jesper and Mayer Stefan, PIV Study of the
Effect of Piston Motion on the Confined Swirling Flow in the Scavenging Process in 2-
Stroke Marine Diesel Engines. 26th CIMAC World Congress on Combustion Engine
Technology, June 2010, Bergen, Norway. (Accepted for oral presentation )
FT 187DCMT
PSS/CRS