Improvement of hull form design using propeller load variation tests

Article type: Research Article

Authors: Yang, Seung-Il^{; *}

Affiliations: Ship Research Station, Korea Institute of Machinery & Metals, Chungnam, Korea

Note: [*] Recently, visiting research scientist, The University of Michigan, Ann Arbor, Mich. U.S.A.

Abstract: This study presents the analysis of hull-propeller interaction in terms of the inviscid and viscous components of the thrust deduction and wake. The inviscid components are calculated by the method of singularities. The calculation of the inviscid thrust deduction needs the hull wake at the propeller plane as well as the wavemaking resistance of hull alone, propeller alone and hull with propeller. The viscous components are estimated by representing them as a function of the propeller thrust load after subtracting the inviscid components from total thrust deduction and wake which are obtained by propeller load variation tests. A new method is established to predict the powering performance of a ship for a change of the propeller working condition due to the systematic modification of a parent hull form. This study also demonstrates a practical application to the hull form improvement of a container ship whose afterbody waterplane and section shapes are systematically varied. The hull form with optimum afterbody is chosen from the power point of view and the effectiveness of the method is considered to be acceptable showing good agreement with experiments.

DOI: 10.3233/ISP-1987-3439401

Journal: International Shipbuilding Progress, vol. 34, no. 394, pp. 100-111, 1987