Luo Luo assisted DFDS ferry system upgrade
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The other three DFDS Haidu have upgraded their propellers with the Rolls-Royce Promas Lite system, maximizing propulsion efficiency and reducing fuel consumption and emissions.
Three sea crossings, such as "Dover", "Dunkerque" and "Delft", serve the route between Dover and Dunkerque across the English Channel. The original design service for the three sister ferries was 26.5 knots and the Kamewa propeller was used to optimize its speed. This sea route requires the ship to be in a low-speed state of navigation at a speed of 18-19.5 knots. It can be accelerated when the trip is delayed, and the power can be increased accordingly during the landing operation. This results in inefficient operation of the ship and increased vibration during handling. The single axis of the ferry is double scull, only one host can be used for normal navigation, resulting in excess power.
The reason for choosing the Promas Lite system is that it combines the rudder propellers to maximize fluid dynamic performance compared to conventional propeller blades. The design originated from the factory of Rolls-Royce Rolls-Royce in Christina, Switzerland.
The new type of blade is mounted on the original hub, a special hub cap is mounted on the paddle, and a ball nose is welded to the existing steering gear. This design makes the water flow smoother. The design effectively utilizes the energy previously consumed in the water stream, increasing thrust and reducing drag. The hub cap is mounted directly on the propeller and is used only to improve water flow, thus effectively controlling costs and reducing technical difficulty. Existing control systems need to be adjusted to ensure optimal host power and pitch for maximum efficiency.
“Usually, we predict that the PromasLite system will be installed in this type of vessel, which will increase the speed by 10%-15% compared to the ideal operation of its original designâ€, Propeller and Waterjet Propulsion System Sales Service Manager Klas Nygren said. “It also depends on the time it takes to change the speed of the operation. Although the efficiency improvement is generally reduced gradually, the final fuel consumption and emissions will be significantly reduced. The height matching of the system significantly reduces the propeller vibration. Improved driving experience."
The three ferries were fully upgraded in the first quarter of 2012 at the Arno Dunkerque shipyard in France. The first two ships were delivered on time and the third one was delivered two days in advance.
The energy efficiency system will contribute significantly to the DFDS's goal of reducing carbon dioxide emissions by 10% within five years.