Considerations regarding the erosion mechanism of vibratory cavitation

10th International Symposium Machine and Industrial Design in Mechanical Engineering

工业技术;机械制造

Lazar, I.^1 ; Bordeasu, I.^1 ; Popoviciu, M.O.^2 ; Mitelea, I.^1 ; Bena, T.^1 ; Micu, L.M.^3

University Polytechnic of Timisoara, Faculty of Mechanics, Bvd, Mihai Viteazu, No.1, 300222, Romania^1

Academy of Romanian Scientists, Timisoara Branch, Bvd, Mihai Viteazu, No.1, 300222, Romania^2

University of Agricultural Sciences and Veterinary Medicine of Banat King Mihai i from Romania, 119 Calea Aradului, Timisoara

300645, Romania^3

关键词: Cavitation clouds;    Erosion mechanisms;    Exposed surfaces;    Exposure period;    High resistance;    Industrial equipment;    Structure image;    Vibratory devices;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/393/1/012040/pdf
DOI  :  10.1088/1757-899X/393/1/012040

学科分类：工业工程学

来源: IOP

【 摘 要 】

The cavitation erosion researches conducted on vibratory devices presents a way of degradation very similar with those encountered in industrial equipment. Photos of the cavitation cloud as well as the eroded surfaces, at various exposure periods, are the basis of the present work in the description of this destruction mechanism. For the experiments, there were used two materials: gray cast iron with lamellar graphite and a high resistance bronze. The used device is that of the Timisoara Polytechnic University Cavitation Laboratory which respects integrally the prescriptions of ASTM G32-2010 Standards. For the description of the results there are used both the roughness profiles and the structure images of the eroded areas, after four different exposure times (5, 60, 120 and 165 minutes). The cavitation erosion behavior is expressed both by the mean depth erosion (MDE) and the parameters of roughness values of the affected areas. The conclusion show that the specific degradation is determined by the cavitation hydrodynamics, as well as by the repeated implosion of individual bubbles which forms the cavitation cloud attached to the exposed surface.