3. The Effect of a Slat on Boundary Layer Characteristics and Cavitation of the Main Foil

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It is well-known that cavitation is dependent upon the boundary layer characteristics. Therefore, it is considered that the cavitation can be controlled by altering the boundary layer characteristics. This paper deals with a SLAT-FOIL combination, main foil and slat which is placed near the leading edge of the main foil. The slat is one of the boundary layer control devices for foil sections. Firstly, the SLAT-FOIL combinations were designed to increase the pressure at the laminar separation point as high as possible, and its cavitation suppression effect was verified by the cavitation tunnel tests. Secondly, the interaction between the slat wake and the boundary layer on the main foil was studied, and it was found that when the slat wake merged into the boundary layer on the main foil, it accelerated turbulent transition. If the pressure at the turbulent transition point was high enough, the cavitation was remarkably suppressed. In conclusion, two effects of the slat on the cavitation control (suppression) can be suggested as follows. 1. A slat can change the pressure distribution on the foil. As the result of increase of the pressure at the laminar separation point, the incipient cavitation number of sheet type cavity can be decreased. 2. When a slat is placed near the foil, the wake of the slat is mixed into the boundary layer on the main foil, which accelerates turbulent transition. If the pressure at the transition point is high enough, the incipient cavitation number is remarkably decreased.
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3. The Effect of a Slat on Boundary Layer Characteristics and Cavitation of the Main Foil

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