ON CORRELATION OF CAVITATION EROSION AND NOISE ON A FOIL SECTION

来源 :Journal of Hydrodynamics(Ser.B) | 被引量 : 0次 | 上传用户:pingerk
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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 patternwas recorded by pure indium specimens and noise was measured with a hydrophone mounted inside the tunnel.Thebroadband 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 lawrelation does not exist between pitting rate and velocity,and neither between SPL and velocity.It was noticed thatthe different trends of SPL for these two different types of cavitation could be qualitatively linked to their pittingrates by using some SPL values at high center frequencies. 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 patternwas recorded by pure indium specimens and noise was measured with a hydrophone mounted inside the tunnel.Thebroadband 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 lawrelation 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 pittingrates by using some SPL values ​​at high center frequencies.
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