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Enforcement of IMO regulations on GHG emission reduction has increased demand for ship energy-saving devices, to ensure compliance with CII (Carbon Intensity Index) and EEXI/EEDI measures. Propeller boss cap fin technologies are a retrofit solution that increase propeller efficiency by weakening hub-vortex effects. Experimental and numerical results suggest that boss cap fins contribute a small amount of thrust which when combined with torque reduction enhances hull efficiency. ERMA FIRST boss cap fin design, FLEXCAP, is a modular design that allows custom fin placement on assembly. This work summarizes the findings of a systematic investigation on fin size/orientation effects on open-water performance. This study considers a FLEXCAP retrofit installation on a 91800 DTW Bulk Carrier. The performance gains for each FLEXCAP design are quantified using steady RANS simulations in the STAR CCM+ environment. The simulation template developed was validated using mesh independence studies and comparisons of open water measures (i.e., thrust coefficient) against other works and experimental data. The installation of FLEXCAP has been parametrically investigated and yields up to 2.2% performance gains compared to the original propeller geometry without the boss cap fins. Sea trial measurements confirm the trends predicted using CFD simulations, confirming that the FLEXCAP weakens the hub vortex and reduces rotational energy losses.

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Parametric Study on the Effects of Fin Size and Orientation for the Modular Boss Cap Fin FLEXCAP

  • 会议论文

  • 发表日期：

    2025年

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  • Dimitra Anevlavi,
  • Vasileios Tsarsitalidis

摘要

Enforcement of IMO regulations on GHG emission reduction has increased demand for ship energy-saving devices, to ensure compliance with CII (Carbon Intensity Index) and EEXI/EEDI measures. Propeller boss cap fin technologies are a retrofit solution that increase propeller efficiency by weakening hub-vortex effects. Experimental and numerical results suggest that boss cap fins contribute a small amount of thrust which when combined with torque reduction enhances hull efficiency. ERMA FIRST boss cap fin design, FLEXCAP, is a modular design that allows custom fin placement on assembly. This work summarizes the findings of a systematic investigation on fin size/orientation effects on open-water performance. This study considers a FLEXCAP retrofit installation on a 91800 DTW Bulk Carrier. The performance gains for each FLEXCAP design are quantified using steady RANS simulations in the STAR CCM+ environment. The simulation template developed was validated using mesh independence studies and comparisons of open water measures (i.e., thrust coefficient) against other works and experimental data. The installation of FLEXCAP has been parametrically investigated and yields up to 2.2% performance gains compared to the original propeller geometry without the boss cap fins. Sea trial measurements confirm the trends predicted using CFD simulations, confirming that the FLEXCAP weakens the hub vortex and reduces rotational energy losses.