摘要：For high accuracy of theoretical prediction of propeller cavitation, it is indispensable to investigate the behavior of unsteady cavitation on propeller blades. Various methods of measuring cavity shapes have been proposed such as using stereo photography, pin gauge and laser beam scattering. Recently, authors have developed a method of measuring the three-dimensional shape using a combination line CCD camera measurement method which can measure faster and more accurate than previous conventional methods. To verify effectiveness of the developed system, model experiments on a highly skewed propeller of a training ship “SEIUN-MARUI" has been carried out in the large cavitation tunnel of NMRI. Through the experiments, the authors show the measurement results of model propeller blades shape and cavity shapes on the blades. Furthermore, the authors have verified the accuracy through a comparison of the pressure fluctuation estimated by the cavity volume and measured by the pressure sensor. In the estimation, since the unsteady cavity is replaced by a spherical bubble moving with varying radius, the pressure fluctuation induced by the sphere is calculated. The pressure fluctuation is estimated by applying the proposed method to experimental data of the cavity shape. The pressure fluctuation estimated by the proposed method is in good agreement with the pressure fluctuation measured by pressure sensors. This result also shows that the developed measurement system can measure the cavity shape with sufficient accuracy.
