The test results on cavitation and cavitation damage in a cavitation tunnel are presented in this paper.The cavitator in the shape of 60 deg.symmetric wedge was mounted in- to the inlet of the working section of 20...The test results on cavitation and cavitation damage in a cavitation tunnel are presented in this paper.The cavitator in the shape of 60 deg.symmetric wedge was mounted in- to the inlet of the working section of 20×40×170mm^3 in size.The velocities ranged from 8.5m/s to 13.5m/s.At first,the flow structure around the wedge was revealed by a Laser Doppler Velocimetry.Then,the fluctuating pressure signals induced by vortex cavitation were picked up by a micro-transducer.Cavitation erosion tests were just done at the velocity of 13.5m/s.The aim of this work is to investigate the relation between cavitation inception and flow structure and to explore the dependence of cavitation damage on cavitation intensity.The cavitation intensity which is defined as the power density per unit time can be regarded as the in- put of the test system.The intensity of cavitation damage is supposed to be the consumed power density per unit time and considered as the output of the system of test,The ratio of the output to the input is as the efficiency of the test system.The test results also show that the output is very small in quantity as compared with the input.展开更多
The paper concerns with the design philosophy,feasibility study,as well as some peculiar features of IWHR water tunnel for cavitation research.The highlights worth-mentioning are the maximum velocity of 35m/s and Reyn...The paper concerns with the design philosophy,feasibility study,as well as some peculiar features of IWHR water tunnel for cavitation research.The highlights worth-mentioning are the maximum velocity of 35m/s and Reynolds number of 1×10~7 as well as the provision of a specially designed air resorber.展开更多
文摘The test results on cavitation and cavitation damage in a cavitation tunnel are presented in this paper.The cavitator in the shape of 60 deg.symmetric wedge was mounted in- to the inlet of the working section of 20×40×170mm^3 in size.The velocities ranged from 8.5m/s to 13.5m/s.At first,the flow structure around the wedge was revealed by a Laser Doppler Velocimetry.Then,the fluctuating pressure signals induced by vortex cavitation were picked up by a micro-transducer.Cavitation erosion tests were just done at the velocity of 13.5m/s.The aim of this work is to investigate the relation between cavitation inception and flow structure and to explore the dependence of cavitation damage on cavitation intensity.The cavitation intensity which is defined as the power density per unit time can be regarded as the in- put of the test system.The intensity of cavitation damage is supposed to be the consumed power density per unit time and considered as the output of the system of test,The ratio of the output to the input is as the efficiency of the test system.The test results also show that the output is very small in quantity as compared with the input.
文摘The paper concerns with the design philosophy,feasibility study,as well as some peculiar features of IWHR water tunnel for cavitation research.The highlights worth-mentioning are the maximum velocity of 35m/s and Reynolds number of 1×10~7 as well as the provision of a specially designed air resorber.
