Energy Saving Device
IGVS Inlet Guided Vane with Shroud
The IGVS, is designed to improve the efficiency of the ship’s propulsion system
The IGVS (Inlet Guided Vane with Shroud) is a type of Energy Saving Device (ESD) engineered to enhance the efficiency of ship propulsion systems. The optimal device or combination of devices is determined based on the specific characteristics of the vessel. These devices need to be designed in tandem with the propeller or propeller-nozzle assembly to maximize propulsive efficiency.
We employs CFD-based design methodologies for the selection and detailed design of IGVS. With over 20 years of experience in propeller and nozzle design, this methodology has been developed and validated. This expertise enables our engineers to offer personalized and comprehensive services for the design of complete propulsion systems.
Design IGVS
Principle of the IGVS
• Improves the degree of flow separation at the stern, enhancing hull efficiency.
• Applies beneficial pre-swirl based on the propeller load distribution, reducing wake rotational energy loss.
• Improves the non-uniformity of inflow to the aft propeller, reducing the wake peak in high wake regions.
• Generates additional thrust through the pre-swirl energy-saving device
Case Study
WINNING MISSION IGVS Design and installation
After a series of processes including positioning assembly welding and precision control, the hydrodynamic energy-saving devices (IGVS and vortex fin) for MV WINNING MISSION were successfully installed at Zhoushan Xinya Shipyard.
The IGVS weighs 13.7 tons, and together with the vortex fin, the total weight reaches 15.7 tons. The installation precision and on-site construction process requirements are very high. The bow and stern accuracy deviation must be within -5mm to +2mm, the eccentricity must not exceed 2.5mm, the perpendicularity of the reference plane to the axis must not exceed 0.5°, and the final installation position of the pre-swirl stator must be within 18mm.
IGVS 3D Model
Install the IGVS
NDT test after welding
The IGVS weighs 13.7 tons, and together with the vortex fin, the total weight reaches 15.7 tons. The installation precision and on-site construction process requirements are very high. The bow and stern accuracy deviation must be within -5mm to +2mm, the eccentricity must not exceed 2.5mm, the perpendicularity of the reference plane to the axis must not exceed 0.5°, and the final installation position of the pre-swirl stator must be within 18mm.
During the installation, the on-site engineers developed a detailed construction plan, analyzing and discussing the unique characteristics and stress distribution points of the duct during construction to prevent deformation. After multiple monitoring and measurements, the welding inspection of the duct was successfully completed within the construction period, with all data meeting the design requirements.
IGVS Installation completed
Why Choose Us
Our energy-saving device, IGVS, is custom-designed for different boats. It aims to improve propulsion efficiency and reduce fuel consumption and emissions, thereby alleviating environmental pollution and meeting various international environmental standards for ship operations.
We also provide ship repair and retrofitting services for propellers and other parts. Additionally, we deliver parts such as bolts and nuts worldwide through our professional logistics service.