肥大船自航試験の理論的取扱い

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With increase of fullness of ship, the self-propulsion test is becoming more and more difficult because of many causes such as flow instability and decrease of measured quantities, etc. So each model tank is improving its own method of the test. In this paper, the authors present a theoretical approach to the self-propulsion test of full ship, which utilizes measured hull resistance and wake data. The full ship adopted here consists of the actual ship form and the infinitely bladed propeller. One side of the after body surface of the ship hull is divided into 180 (12×15) platelets. Solving the hull surface boundary condition by Hess-Smith's method, the densities of platelet sources are determined. On the other hand, the propeller plane is divided into 180 (5×36) sectors and the strength of bound vortex is assumed to, be constant in each sector. Solving the propeller plane boundary condition using the wake data, the bound vortex are determined. From the source and vortex distributions, the thrust and torque of the propeller and the increase of the hull resistance are calculated. Then the thrust of the' propeller and the resistance of the hull are made to be in agreement by iteration procedure and at the end the self-propulsion factors are obtained by the thrust-identity method using the results of open water tests on the propeller. Here the contraction of flow due to propeller suction is. taken into consideration in evaluating the nominal wake distribution for the full load condition. The presence of the rudder and the viscous part of the thrust deduction and the wavemaking phenomena are ignored in the calculation. The obtained results seem to be reasonable.
社団法人日本船舶海洋工学会の論文

肥大船自航試験の理論的取扱い

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