係留けん引時の推力減少率

概要

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The Bollard pull test for “Fukae maru” was carried out with the varied pitch angle under constant propeller revolution. Making use of measured values, the torque and thrust coefficients of a actual propeller were calculated at advance coefficient of zero. These coefficients were compared with the both results of open water test with a model propeller and open water propeller series test.<BR>The actual torque coefficients were consequently between the both results. On the other hand, the actual thrust coefficients are smaller than those of open water test and nearly equal to those of propeller series test.<BR>If those of open water test were considered standard, the thrust deduction ratio become 0.13-0.15. As these values are larger than generally estimated value and the deduction ratio is different by the analized method, the thrust on bollard pull condition ought to be estimated carefully.<BR>*: The thrust deduction ratio is not the thrust deduction factor which is defined on advanced ship. It is the deductive rate of the actual thrust from the designed thrust at advanced coefficient of zero.
社団法人日本マリンエンジニアリング学会の論文