Performance of counter-rotating tandem propellers at oblique flow conditions

Nak Joong Lee, Morihito Inagaki, Toshiaki Kanemoto

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


Tidal currents are a potential source of reliable and renewable energy. Various power generation systems have been proposed. The authors developed a counter-rotating type tidal stream power unit in which the tandem runners make the inner and the outer armatures counter-rotate. The unit is composed of tandem propellers with 3 front and 5 rear blades and has a promising advantage that the rotational torque between the front runner and the rear propellers, namely the inner and the outer armatures, is balanced in the unit. That is, this tidal stream power unit can be moored with only one cable and then its nose and tail will naturally line up in response to the tidal stream by yawing. In this paper, the performance of the propellers in oblique flow conditions were investigated experimentally and numerically. When the coming flow obliquely to the propeller by 30 degrees, the performance deteriorates by 20%.

Original languageEnglish
Article number052004
JournalIOP Conference Series: Earth and Environmental Science
Issue number5
Publication statusPublished - 2019 Mar 28
Externally publishedYes
Event29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 - Kyoto, Japan
Duration: 2018 Sept 162018 Sept 21


  • Counter-rotating
  • Oblique flow
  • Performance
  • Tandem propellers
  • Tidal currents

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)


Dive into the research topics of 'Performance of counter-rotating tandem propellers at oblique flow conditions'. Together they form a unique fingerprint.

Cite this