F113 船舶抵抗低減のための気泡導入に関する水中翼性能の向上について(OS11 温暖化対策とCO_2削減技術(2))

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  • F113 Improvement of Hydrofoil Performance on Air Bubble Entrainment for Drag Reduction of Ships

抄録

We have investigated flow behaviour around a moving hydrofoil beneath an air-water interface in order to optimize the hydrofoil facility of bubble generation for drag reduction of ship. Experimental results of flow visualization show that the deformation characteristics of the air-water interface depend on the occurrence of the flow separation over the hydrofoil. The attachment of the flaps to the hydrofoils causes significant deformation of the air-water interface in the downstream, which induces wave breaking and results effective bubble generation. On the other hand, we could not observe the effective bubble generation by the vortex generators because the magnitude of the free surface deformation becomes small due to turbulent flow.

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