Study on the Performance Improvement of Ship Propulsion Equipment Directly Driven by High-Pressure Gas (The Effect of Intermittent Gas Ejection and a Flow Visualization Study inside the Nozzle)

Michihisa TSUTAHARA; Kazuhiko OGAWA; Masahiko SAKAMOTO; Takahiro MATSUI; Shinsuke TAJIRI; Masakazu TAJIMA; Hiroki YOKOYAMA

doi:10.1299/jfst.2.120

Papers

Study on the Performance Improvement of Ship Propulsion Equipment Directly Driven by High-Pressure Gas

(The Effect of Intermittent Gas Ejection and a Flow Visualization Study inside the Nozzle)

Michihisa TSUTAHARA, Kazuhiko OGAWA, Masahiko SAKAMOTO, Takahiro MATSUI, Shinsuke TAJIRI, Masakazu TAJIMA, Hiroki YOKOYAMA

著者情報

キーワード: Ship Propulsion, Water Jet, Nozzle Flow, Unsteady Flow, Flow Visualization

ジャーナルフリー

2007 年 2 巻 1 号 p. 120-129

DOI https://doi.org/10.1299/jfst.2.120

詳細

抄録

The flow inside the two-dimensional semi-open-type nozzle for ship propulsion equipment, directly driven by high-pressure gas was investigated experimentally. The flow was unsteady and the gas and water phases clearly separated. We found that these waves appear on the interface for continuous gas ejection. It was clarified that waves play an important role in the pressure distribution. Intermittent gas ejection was also tried. The thrust itself decreases compared with continuous gas ejection, but propulsion efficiency, considering the gas ejection duration is increased. The flow patterns for intermittent gas ejection were also clarified.

責任著者(Corresponding author)

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