EnergoFlow in combination with an optimised fixed pitch propeller ensures better results. Credit: Wärtsilä.

Wärtsilä has introduced a new pre-swirl stator solution to help improve the fuel efficiency of ships.

Part of its propulsion efficiency portfolio, the new Wärtsilä EnergoFlow is an energy saving solution designed to reduce the power losses that occur in a ship’s propeller’s slipstream, improving fuel efficiency by up to 10%.

The stator’s design directs one side of the stern flow in the opposite direction of the propeller rotation. Its multiple fins are attached to the ship’s hull, where they optimise the flow into the propeller and prevent power losses.

The curved fins are also designed to reduce viscous resistance, while a ring connecting the fins at their tips decreases peak stress.

“Wärtsilä EnergoFlow is an energy saving solution designed to reduce the power losses that occur in a ship’s propeller’s slipstream, improving fuel efficiency by up to 10%.”

Wärtsilä Propulsion System Services vice-president Tamara Gruyter said: “Wärtsilä’s solution enables the accurate directing of the pre-swirl flow. This in turn supports our customers in their fuel saving efforts by lowering resistance.

“As the result of increased propulsive efficiency and subsequent energy savings, Wärtsilä EnergoFlow reduces the emissions of ships.

“Investments in energy-efficient solutions ensure cost savings, compliance with maritime regulations and reduced environmental footprint.”

Various research and experimentation with hydrodynamics, energy-saving propulsion efficiency concepts, and pre-swirl models were carried out by Wärtsilä’s research and development (R&D) experts to develop the pre-swirl stator.

Wärtsilä EnergoFlow will mainly be used in bulk carriers, tankers, and other full form vessels.