The infuence of the boundary layer and of the nuclei content in the fluid on cavitation inception is investigated. Two models of ship propellers, displaying sheet cavitation and bubble cavitation respectively, are used. Generation of additional nuclei was obtained by electrolysis. It is shown that nuclei are nessary to create sheet cavitation when the laminar boundary layer separates. When the boundary layer is laminar however, the absence of sheet cavitation is very persistent and independent of the nuclei content. Application of roughness at the leading edge of the propeller blades generates sheet cavitation indepdnent of the nuclei content. Bubble cavitation is strongly affected by the nuclei content of the water. Roughness at the leading edge can indirectly affect bubble cavitation when nuclei are formed by the roughness elements. The effect of cavitation on pressure fluctuations in the free field and on noise radiation is measured and some preliminary expermental results are given. Many observations require further investigations. The paper therefore has the character of a progress report. (Wassmann)
Some experiments with distinguished types of cavitation on ship propellers
Einige Versuche mit verschiedenen Arten der Kavitation an Schiffspropepellern
Int. symp. on cavitatlon inception. ASME ; Dec ; 171-205
1979
35 Seiten, 31 Bilder, 33 Quellen
Aufsatz (Konferenz)
Englisch
Systematic cavitation tunnel experiments with merchant ship propellers
Engineering Index Backfile | 1964
|Cavitation tunnel tests with merchant ship propellers
Engineering Index Backfile | 1960
|Experiments with ship propellers
Engineering Index Backfile | 1907
|Cavitation tunnel tests with merchant ship propellers
TIBKAT | 1961
|Cavitation diagrams for cargo ship propellers
Engineering Index Backfile | 1962
|