ビンゴ 5 の 結果
-Recovering the rotation loss of the propeller, Reducing GHG-

July 09, 2020

TOKYO-Mitsui O.S.K. Lines, Ltd. (MOL; President & CEO: Junichiro Ikeda) today announced that, a group company MOL Techno-Trade Co., Ltd. (MOLTech; President: Hirokazu Hata), MOL, Japan Hamworthy Co., Ltd. (JHC; President: Kazushi Tomita) and Akishima Laboratories(Mitsui Zosen) Inc. (Akiken; President: Taiji Maeda) are conducting research and development on the propeller-mounted energy-saving device called PBCF (Note 1) and the energy-saving ビンゴ 5 の 結果 with bulb fins. We confirmed the energy saving effect of more than 5% with only the energy-saving ビンゴ 5 の 結果 with bulb fins.

In the development of energy-saving ビンゴ 5 の 結果 with bulb fins (hereinafter the "developed ビンゴ 5 の 結果"), we have enhanced the energy-saving performance and improved horsepower by taking advantage of the steering effect of the ビンゴ 5 の 結果 of JHC, a specialized manufacturer of high lift ビンゴ 5 の 結果 such as schilling ビンゴ 5 の 結果. The features of the developed ビンゴ 5 の 結果 are as follows.

• 1) In order to recover the swirling flow of the propeller, the reaction shape is designed as a high thrust blade section and the ビンゴ 5 の 結果 horn is also twisted and integrated so as to increase thrust due to the negative pressure on the ビンゴ 5 の 結果.
• 2) By reducing the size of the end plate under the ビンゴ 5 の 結果, the resistance is reduced and the propeller swirl flow is also blocked.
• 3) The large central bulb has a flat front surface to reduce the propeller inflow speed and improve propeller efficiency.

We used JBC (Japan Bulk Carrier) hull, which is open to the public as a general large-sized hull and widely used in various research and development. Generally, it is difficult to improve the horsepower by 4% or more with a normal reaction ビンゴ 5 の 結果. However, with the developed ビンゴ 5 の 結果, CFD (Computational Fluid Dynamics) showed 5.7% improvement in horsepower and a self-propulsion test in a large towing tank confirmed 5.2% improvement.

The developed ビンゴ 5 の 結果 has been applied to the slender ship types as well, and an energy-saving effect of 4.4% has been confirmed by CFD. In the future, we plan to conduct a large towing tank test after performing optimization work.

We will continue to improve the efficiency by aiming for a synergistic effect with the torque reduction effect of PBCF　for the future installation on actual ships. The developed ビンゴ 5 の 結果 has been patented.

The pressure change (red to blue) on the ビンゴ 5 の 結果 surface is caused by the rotation of the propeller. In other words, it flows in from the port side at the upper ビンゴ 5 の 結果 and from the starboard side at the lower ビンゴ 5 の 結果. We aim to develop a ビンゴ 5 の 結果 that effectively recovers the energy loss of the swirling flow induced by a propeller.

(Note 1);
PBCF: Propeller Boss Cap Fins. A device attached to the propeller of a vessel. It breaks up the hub vortex generated behind the rotating propeller (resulting in energy savings of 3% to 5% compared to an identical vessel not equipped with PBCF).