FPHC: Fin on Propeller Hub Cap

working principle

1. Vortex generation and problems: When a ship's propeller rotates, complex vortices (wake vortices) are generated behind the propeller. These eddies will increase the workload of the propeller, cause energy loss, and reduce the efficiency of the propulsion system.

2. The design of hub fins is usually installed behind the propeller to affect the direction and speed of water flow. Their design generally includes:

-Guide plates: The shape and angle of these plates can optimize water flow and reduce the intensity of eddies.

-Leading wing: Some hub fins are also equipped with leading wings to guide the water flow in front of the propeller and reduce the formation of wake vortices.

-Shape and layout: The shape and layout of the hub cap fins can be adjusted according to the specific situation of the vessel to most effectively reduce eddy currents.

3. Vortex control hub fins control the generation of vortices by altering the path and velocity of water flow. They make the water flow more evenly into the propeller, thereby reducing the generation of eddies. In this way, the hub fin can reduce energy loss during propeller operation and optimize propulsion efficiency.

Energy saving effect

The hub fin reduces the vortex behind the propeller, allowing it to operate under conditions closer to ideal. This improvement can enhance the propulsion efficiency of the propeller, typically achieving an efficiency increase of 1.5% to 3.5%. The specific extent of improvement depends on the design of the vessel, the strength of the eddy current, and the degree of optimization of the hub and fin design.

1. By reducing the vortex and vibration of the hub fins, the tail vortex behind the propeller is lowered. This not only improves the propulsion efficiency of the ship, but also reduces the vibration caused by wake vortices. The reduction of vibration can reduce the mechanical load on the hull and propulsion system, lower maintenance costs, and extend the service life of equipment.

2. Reducing greenhouse gas emissions. The decrease in fuel consumption directly leads to a reduction in greenhouse gas emissions. For large merchant ships or oil tankers, the reduction in CO ₂ emissions can reach thousands of tons per year.

3. Improving ship maneuverability: Due to the reduction of wake vortices, the ship's response will be smoother and more sensitive under different speeds and maneuvering conditions. Although the extent of improvement varies depending on the type and specific situation of the vessel, it usually enhances the maneuverability of the vessel in low-speed or complex environments.

Application scenarios

Hub cap fins are widely used in large vessels such as merchant ships, oil tankers, and container ships. Its energy-saving effect is quite significant, especially in long-distance navigation and high loads, which can effectively reduce operating costs.