Abstract
Abstract The ASTM G134 standard, Standard Test Method for Erosion of Solid Materials by Cavitating Liquid Jet, provides specifications for assessing the material resistance to the cavitation erosion caused by submerged cavitating jet. Nevertheless, the influence of test chamber dimensions on cavitation erosion is not considered in such an international standard. To fill in the gap, nine test chambers with different chamber lengths and diameters were devised to facilitate a comparative investigation of the cavitation aggressive intensity. The cavitation number was fixed at 0.014. Aluminum (JIS A1070) and stainless steel (JIS SUS316L) specimens were used in the experiment. The results show that at the distance of 19 mm between the nozzle outlet section and the specimen surface, the most severe erosion is accomplished, which is shared by the nine test chambers. Both the mass loss and the erosion rate vary with the test chamber length and diameter. A long test chamber is associated with a low erosion rate. The coefficient of variation on the cumulative erosion rate is 12 %. As the chamber length equals the chamber diameter, the coefficient of variation is 3 %. At the test chamber length of 30 mm and diameter of 40 mm, the maximum erosion rate is higher than its counterparts. The present study provides important data for the ASTM G134 standard to decide the operation parameters and test chamber dimensions.
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