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Wartsila introduces pre-swirl stator to improve fuel efficiency

Nov 8, 2017 10:12 AM

(HELSINKI, Finland) — Wartsila has introduced EnergoFlow, an energy-saving solution that will return a ship operator's investment in less than two years. By reducing the power losses which occur in the propeller's slipstream with an optimized inflow, Wartsila's solution improves fuel efficiency by up to 10 percent.

The product was introduced at the Europort event in Rotterdam, the Netherlands, on Nov. 7. The next-generation pre-swirl stator is the result of years of research and experimentation with hydrodynamics, energy-saving propulsion efficiency concepts and pre-swirl models by Wartsila's research and development experts.

EnergoFlow's design guides one side of the stern flow in the opposite direction of the propeller rotation. The stator's multiple fins, which are attached to the ship's hull, optimize the flow into the propeller and prevent power losses. The curved fins minimize the viscous resistance while the ring connecting the fins at their tips decreases the peak stress of each fin.

Cutting fuel costs is a high priority for ship operators. With the Wartsila EnergoFlow, it is possible to achieve fuel savings of up to 10 percent. This efficiency boost reduces fuel consumption and thereby lowers operating costs.

"Wartsila'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," said Tamara de Gruyter, vice president, Propulsion System Services. "As the result of increased propulsive efficiency and subsequent energy savings, Wartsila EnergoFlow reduces the emissions of ships. Investments in energy-efficient solutions ensure cost savings, compliance with maritime regulations and reduced environmental footprint."

The impact of the Wartsila EnergoFlow on fuel consumption is the largest on bulk carriers, tankers, and other full form vessels. Bulk carriers, for instance, can see fuel savings in the 10 percent range. Regardless of ship type, the Wartsila EnergoFlow pays for itself within one to two years of operation. The Wartsila EnergoFlow has been developed with an extra focus on the services market.

For more information, visit www.wartsila.com.

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