プロペラ効率比の非定常摩擦成分の計算

概要

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In the thrust identity approach of the propulsion test analysis, the relative rotative efficiency is defined as the ratio of torque between the open-water test and the propulsion test under the same thrust condition. Usually, values of the relative rotative efficiency are close to the unity and are beyond the unity a little. To clarify the mechanism of the self propulsion factors, researches were carried out and the cause that the relative rotative efficiency exceeds the unity is investigated. However, in researches until now the unsteady viscous friction effects on torque are ignored. In present paper the amount of unsteady factional components of the relative rotative efficiency is examined numerically. Potential components of unsteady pressure distributions on propeller blades are calculated by the unsteady vortex lattice program, and the unsteady skin frictions on blade surface are predicted by the quasi-three-dimensional unsteady propeller boundary layer calculation. Calculations are performed for the former SEIUN-MAKU conventional propeller. Estimated unsteady frictional component of the relative rotative efficiency is about 1% and it is concluded that unsteady frictional effect cannot be ignored.
社団法人日本船舶海洋工学会の論文
2002-03-20