シャフトブラケット模型まわりの流れの観察と平板上ストラット接合部周辺流れのCFD計算

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For the bearing of the propeller shaft of twin screw ships, the shaft bracket is mostly used. The shaft bracket is composed of V-shaped struts which are connected by a boss. The flow around the shaft bracket is so called junction flow near the connection parts of struts to the boss and the ship hull surface. The observation of the flow around the model of the shaft bracket has been carried out in the circulating water channel by two flow visualization methods, one of which is the oil-film method for limiting streamlines and the other of which is the method of color ink injection for streak lines. Nextly we measured the distribution of velocity vectors in three horizontal planes, at the level of the centerline of the boss, at the level of the top of the boss and at the 10cm high level above the center of the boss in the wind tunnel. By these flow visualizations the separation of flow on the surface of the strut has been caught clearly in the photographs, and the separation line has been found to draw different curves outside and inside of the strut in the vicinity of the boss and the flat plate in place of the hull surface. The similar aspect of the flow separation on the surface of the strut mounted laterally inclining on the flat plate has been shown by the computer simulation of CFD computation of a NS solver employing a finite difference method. The comparison between experiments and CFD computation gives good agreement and interesting results about the junction flow of the shaft bracket.
社団法人日本船舶海洋工学会の論文
1994-03-29

シャフトブラケット模型まわりの流れの観察と平板上ストラット接合部周辺流れのCFD計算

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