Manipulating cavitation by a wall jet: Experiments on a 2D hydrofoil

摘要

Highlights?The low-speed (Uinj/U0??The low-speed injection simultaneously causes an increase of the turbulence intensity over the hydrofoil surface, which increases its drag and impairs its hydrodynamic quality.?The high-speed (Uinj/U0?>?1) injection is more preferable from the hydrodynamic standpoint but makes the flow more cavitation-prone.?In unsteady regimes, the wall jet turns out to be mostly ineffective to suppress flow instabilities but can substantially reduce the amplitude of pressure pulsations.?At high attack angles, an unsteady sheet cavity on the hydrofoil with the slot channel exhibits intermittent length variations due to superposition of instabilities.