疏浚钢管直管段磨损试验研究.

The wear of conveying steel pipes has always been one of the key issues for research in the dredging industry. In this paper, the wear of the straight section of a pipe of Q235 with a diameter of DN50 and a length of 300 mm under 40%volume concentration of coarse sand, and the wear of coarse sand are studied experimentally. The results show that the wear rate of the same batch of coarse sand at a flow rate of 4.2 m/s decreased with time. The wear rate in the first 8 h was 1.875 g/(h·m)while the wear rate in the last two 16 h was only 0.52 g/(h·m)and 0.42 g/(h·m). After 40 hours of wear, the median particle size of coarse sand decreased from 0.82 mm to 0.75 mm. At the flow rate of 4.2 m/s, the wear amount of different batches of coarse sand in the straight pipe section is linear with time every 8 h and the slope is about 0.518 8, with an average wear rate of about1.736 g/(h·m), and the median particle size of coarse sand was basically unchanged during the experiment. The wear rate of coarse sand on the straight pipe section increased with the increase of flow rate. The wear rates at the flow rates of 2.2 m/s, 3.2m/s and 4.2 m/s were 0.625 g/(h·m), 1.25 g/(h·m)and 1.875 g/(h·m), respectively, showing a linear relationship. The median particle size of coarse sand during the experiment was basically unchanged, but at the flow rate of 5.2 m/s, the wear rate of the straight pipe section increased sharply to 3.54 g/(h·m), and the median particle size of coarse sand decreased from 0.82 mm to0.72 mm. This study results can provide experimental data support for pipeline wear estimation and numerical simulation of pipeline wear [ABSTRACT FROM AUTHOR]