Hydrodynamic Engineering Calculation of Hull Suction Volume in the Backflow of Cascade Angle Region

Abstract

Abstract This article uses computational fluid dynamics (CFD) method to carry out a numerical study on a rectangular high-load diffuser cascade of a ship hull with a full-blade high suction trough unit at different chord positions, and analyses the chord position and other parameters of the suction trough. The influence on the distribution law of the suction volume; the effect of the local extended suction scheme is explored through the cascade experiment. The computational domain of the numerical simulation includes the vacuum cavity inside the suction blade, and the boundary conditions are set according to the experimental conditions. The distribution law of the suction volume along the span is affected by the combined effect of the cascade flow path and the flow field of the blade cavity. Therefore, the suction surface suction groove/hole should be refined according to the specific characteristics of the three-dimensional high-load diffuser cascade flow field design.