斜航船体まわりの流場と流体力の計測

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The objective of this paper is to clarify the the structure of the wake flow around a ship hull and to investigate hydrodynamic forces and moment acting on the ship in manoeuvring motion by means of experimental approaches. There is little information known about the wake structure. Therefore the wake measurement is not only important as a fundamental study on the hydrodynamic mechanism of the forces and moment but also useful to improve the mathematical model for the practical simulation study of manoeuvring motions in various conditions. Measurement of hydrodynamic forces and moment on a ship model, which has semi-elliptic frame lines and symmetrical fore and aft bodies, towing with constant drift angle is conducted. Surface pressure distribution on the hull in the same condition is measured and integrated. Pressure distribution on the hull surface, lift distribution on the centre plane, lateral force distribution along ship length and total force and moment on the ship model are examined. Wake flow measurement by means of rotor-type vortex-meters is carried out in five different transverse planes. Though the correspondence of the result to the measured force or pressure is not so good, quantitative information on trailing vortices is quite helpful to investigate the wake structure and its relation to the forces. Flow visualization technique by means of dye tracer method is applied, and the trailing vortices and surface streamlines on the hull are observed. Concentration and distribution of vorticity in the wake, trace of the vortex core and the relation to separation lines are examined. Some knowledge on the wake structure, especially the behavior of the trailing vortices, and the shape of force and pressure distribution, is obtained.
社団法人日本船舶海洋工学会の論文
1983-08-24

斜航船体まわりの流場と流体力の計測

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