25-08-2017, 09:32 PM
Reduction of aerodynamic resistance
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INTRODUCTION
FORCE Technology and Grontmij|Carl Bro have joined
forces in a new concept study under the Danish
industry project Green Ship of the Future.
The aim of the project is to reduce the ship’s
aerodynamic resistance and thereby reduce the
fuel consumption.
In the project, the handysize bulk carrier Seahorse
35 from Grontmij|Carl Bro is evaluated.
With 7,500kW installed power for the main
propulsion and specific fuel oil consumption of
165g/kWh, the daily consumption is approximately
30 tons heavy fuel oil per day or 9,000
tons at an operation profile of 300 sea days - so
even a small percentage-wise decrease in fuel
consumption will have a noticeable effect on
the ship’s yearly operational costs.
Optimising design through wind
tunnel testing
A new aerodynamic design starts in the advanced
boundary-layer wind tunnel at FORCE
Technology. Here the original design will be
measured, tested and evaluated by wind load
experts from FORCE Technology and the designers
from Grontmij|Carl Bro.
When the original ship design is tested, a drag
analysis will be performed in order to locate
the areas on the ship that contribute to friction
drag.
Afterwards, the pressure drag will be investigated
through different flow visualisation tests
in order to evaluate the flow behaviour around
the superstructure. Especially the behaviour
of the boundary layer on the structure will be
observed. The main issue of boundary layer
analysis is to locate recirculation zones, stagnation
points, separating flow etc.
The results of these tests will be implemented
in the SeaHorse 35, and the adjusted design is
expected to be able to save approximately 4%
of the ship’s fuel oil consumption.