The inception and form of attached cavitation can be significantly effected by the presence of traveling bubbles. Traveling bubbles may induce transient regions of incipient attached cavitation. Furthermore, traveling bubbles may sweep away regions of developed attached cavitation. The number and size of traveling bubbles which will occur in a flow is strongly dependent on the freestream nuclei distribution. Consequently, bubble/attached cavity interactions provide a mechanism whereby the freestream nuclei distribution can significantly influence the inception and form of attached cavitation. Experiments were performed on a rectangular planform hydrofoil to investigate this phenomena. Individual cavitation nuclei were created in the flow via a focused laser beam to create individual traveling bubbles. These bubbles were observed as they interacted with the flow near the foil and as they interacted with developed attached cavitation present at the foil mid cord. Tripping was used to stimulate turbulent transition in the boundary layer, and the interaction of the traveling bubbles differed for the smooth and tripped conditions. The differences in how the traveling bubbles interact with the boundary layer and the attached cavitation can be related to the state of the boundary layer.
Interaction of traveling bubbles with the boundary layer and attached cavitation
Interaktion wandernder Blasen mit der Grenzschicht und damit verbundene Kavitation
1995
16 Seiten, 10 Bilder, 16 Quellen
Conference paper
English
Interaction of Traveling Bubbles with the Boundary Layer and Attached Cavitation
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