Parametric Studies of Effect of Cavitation Jet Modes on Wear Rate of Surface of Structural Materials

Abstract

In this study the kinetic curves of cavitation wear of cast steels 20 GL and 30 L used for production of critical elements of hydraulic machines were obtained. The typical predominance of growth rate of cavitation mark diameter over its depth was found on the surfaces of the investigated cast steels. The revealed phenomenon made it possible to offer a formula for estimating the volume removal of the examined cast steels in order to expand the scope of the method according to ASTM G134-17. This method uses profilometry and microscopy and allows to determine cavitation resistance both for homogeneous and heterogeneous materials, including materials after modification of their surface (with different types of coatings and hardenings).

Study on Dynamic Evolution and Erosion Characteristics of Cavitation Clouds in Submerged Cavitating Water Jets

“…The image resolution was 780 × 780 px. A scanning electron microscope was used to observe its microscopic appearance [24]. The secondary electron detector (SED) was selected to obtain a clearer and more three-dimensional image of the edge morphology of the cavitation pit [25].…”

A Study of Cavitation Erosion in Artificial Submerged Water Jets

“…As shown in Figure 1a, d is the diameters of the inner nozzle; L 1 , L 2 , and δ denote the throat length, divergent segment length, and divergent angle of the inner nozzle; β is the convergent angle of the outer nozzle; and D stands for the inner clearance between the inner and outer nozzle. The standoff distance is S, which is the same for the inner and external nozzle [34]. To fully capture the cavitation cloud distribution pattern on the workpiece wall, the workpiece diameter F w should be large enough relative to the nozzle diameter.…”