Pages 55-64
The present paper descridescribes the experimental study on hull surface pressure making use of three Wigley geosim models relating to the 17th ITTC cooperative works. The results of experiments are applied to some investigations of the characteristics of pressure resistance and resistance components, Main conclusions of the investigations are as follows ; (1) A certain Reynolds number effect is recognized in pressure distribution near the stern. (2) The pressure resistance obtained by integrating the measured local pressure over the hull is compared with residual resistance, wave resistance and wave pattern resistance. Further, the frictional resistance derived by subtracting measured pressure resistance from total resistance is evaluated by comparing with the skin friction formulae of flat plate. (3) The pressure resistance components for forebody and afterbody are respectively analyzed. The contribution of pressures to resistance above load water line is predominant at forebody, while the substance of the hump/hollow of wave resistance are exemplified in the pressure resistance of afterbody. (4) The measured pressure distributions are compared with the calculated results by modified Guilloton's method which includes the boundary layer effect on wave source potential, and good agreements are obtained.
