The erosion evolution phenomenon usually renders the erosion model unable to accurately calculate the dynamic change of the wall thickness. Based on an erosion experiment and numerical simulation, the erosion evolution on the upstream surface of floating ball valves with 30% opening was described using 3D imaging and moving grid techniques. An erosion evolution model that can summarize the temporal variation of each factor was proposed. The resulting erosion rate in the severely eroded area (points B, E and H in the middle portion of the upstream surface) showed a decreasing trend during erosion. The erosion rate was 0.9 times that prior to surface thinning after 250 kg sand load and was 0.825 times and 0.755 times that after 350 kg sand load and 450 kg sand load, respectively. The error of the erosion evolution model when applied to the erosion of the ball valve core upstream was less than 20% under a flow velocity of 9~80 m/s, sand particle size of 35~500 μm, and volume concentration of 1.6×10–13 to 5.7×10–6. When the erosion evolution model was applied to 19~80 m/s flow velocity, 150~230 μm sand particle size, and 1.68×10–7 to 2.6×10–5 volume concentration and with the geometrical model dissimilar to the ball valve upstream surface curvature, the prediction value can be controlled within the same order of magnitude as the experimental value.
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