Abstract
We have conducted laboratory experiments on air entrainment and bubble generation by rotating ventilated hydrofoils aimed at reducing power consumption by subsurface aerator. The negative pressure generated on the hydrofoil drives the atmospheric air into water, which enables the subsurface aeration without air compression. Small air bubbles with the diameter from sub-mm to mm order were generated by the turbulent shear flow around the rotating hydrofoils. We experimentally obtained threshold of air entrainment, air volume flux, and power consumption by the hydrofoil bubble generators, which depend on the rotating speed, water depth, and angle of attack of the hydrofoil.
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