Three types of vibrations on a supercavitating hydrofoil

Abstract

In order to clarify the hydroelastic performance of the violent vibrations arisen within the transient region between the supercavitating region and the subcavitating one, a typical case of the supercavitating hydrofoil PSC1-1 was taken up at a typical incidence alpha(sub i) = 4 deg (0.070 rad), when the three kinds of the violent vibrations take place the most typically. And the two-dimensional hydroelastic performance was investigated systematically by means of stereo-highspeed-observations of the cavitation aspects and by measuring the lift- and the drag-fluctuations as well as the cavitation-shock-pressures.

超キャビテーション下の領域とサブキャビテーション下の領域との間の過渡的領域内に発生する激しい振動の流体弾性特性を明らかにするために、3種の激しい振動が最も発生し易い典型的入射角α(sub i)=4度(0.070ラジアン)における超キャビテーション下の水中翼PSC1-1を代表例として取り上げた。キャビテーションの様子を立体高速観察法により、また揚抗変動およびキャビテーション衝撃圧を測定することにより2次元流体弾性性能を系統的に検討した。