Demo Case

Expanding the application of ESDs to ships with CPP

Expanding the application of ESDs to ships with CPP

In FP7 project GRIP, MARIN and Wärtsilä with partners worked on designing and optimising Energy Saving Devices (ESDs) for ships fitted with a Fixed Pitch Propeller (FPP). This resulted in the full scale demonstration of nearly 7% reduction in required propulsion power on a bulk carrier. To increase the total impact of ESDs on shipping energy consumption in additional markets, the next step is to investigate the energy saving potential of ESDs for ships with a Controllable Pitch Propeller (CPP). Most effective ESDs modify the swirl in the inflow (pre-swirl) or outflow (post-swirl) of the propeller. The amount of swirl strongly depends on the pitch of the propeller. As this is variable in a CPP, an additional optimisation challenge is added for ESDs for CPP.

This is done by designing, simulating and testing an ESD design for a Grimaldi vessel. Wärtsilä and MARIN are responsible for the ESD design and simulations, after model scale testing Wärtsilä will produce the ESD to be installed on the Grimaldi vessel for dedicated demonstration trials. ESDs under consideration are pre-swirl stators, pre-swirl ducts and post swirl propeller hub cap fins.