Thrust enhancement of DTMB 5415 with elastic flapping foil in regular head waves

Lei Mei, Wenhui Yan, Junwei Zhou, Weichao Shi

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Abstract

Recent studies indicate that bow foil biomimetic systems can significantly improve ship propulsion in waves. In this paper, the DTMB 5415 ship model is taken as the object and a semi-active elastic flapping foil is proposed to install at its bow underwater position. When a ship sails in head wave, heave and pitch motion will occur, which will drive the bow foil to form heave motion. According to the working characteristics of elastic foil, bow foil can generate forward thrust under drive of given heave motion. At first, co-simulation of the ship with self-pitching bow foil in head waves is realized by ISIS-CFD solver and preliminarily realizes drag reduction and thrust increase effect of the bow foil. At the same time, it is found that the effect of bow foil on hull drag reduction is reflected in two aspects, one is the additional thrust generated by the bow foil and the other is that suppression of the bow foil on hull motion also reduces hull resistance in waves. Then, in order to optimize the working characteristics of elastic bow foil, the influence of spring stiffness and span length of the bow foil on drag reduction and thrust increase effect is discussed. A preliminary spring optimization result is obtained, as well as the influence of the span length of the bow foil on the system.
Original languageEnglish
Article number632
Number of pages28
JournalJournal of Marine Science and Engineering
Volume11
Issue number3
DOIs
Publication statusPublished - 17 Mar 2023

Keywords

  • ocean engineering
  • water science and technology
  • civil and structural engineering
  • thrust enhancement
  • resistance reduction
  • elastic flapping foil
  • regular wave
  • torion spring stiffness

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