Tests with two different sized models were conducted in the Marine Propeller Cavitation Tunnel at the Univer- sity of Tokyo.At two angles of attack the developed sheet-cloud and bubble cavitation occurred.Erosion patt...Tests with two different sized models were conducted in the Marine Propeller Cavitation Tunnel at the Univer- sity of Tokyo.At two angles of attack the developed sheet-cloud and bubble cavitation occurred.Erosion pattern was recorded by pure indium specimens and noise was measured with a hydrophone mounted inside the tunnel.The broadband SPL was mainly used for correlation of noise with pit counting results from erosion.In case of sheet- cloud cavitation power law relations between velocity and SPL have been found and there existed a linear relation- ship between SPL values and IgPR values(PR-pitting rate).However in case of bubble cavitation such power law relation does not exist between pitting rate and velocity,and neither between SPL and velocity.It was noticed that the different trends of SPL for these two different types of cavitation could be qualitatively linked to their pitting rates by using some SPL values at high center frequencies.展开更多
文摘Tests with two different sized models were conducted in the Marine Propeller Cavitation Tunnel at the Univer- sity of Tokyo.At two angles of attack the developed sheet-cloud and bubble cavitation occurred.Erosion pattern was recorded by pure indium specimens and noise was measured with a hydrophone mounted inside the tunnel.The broadband SPL was mainly used for correlation of noise with pit counting results from erosion.In case of sheet- cloud cavitation power law relations between velocity and SPL have been found and there existed a linear relation- ship between SPL values and IgPR values(PR-pitting rate).However in case of bubble cavitation such power law relation does not exist between pitting rate and velocity,and neither between SPL and velocity.It was noticed that the different trends of SPL for these two different types of cavitation could be qualitatively linked to their pitting rates by using some SPL values at high center frequencies.
