【摘要】 输送钢管的磨损一直是疏浚行业重点研究的问题之一，文章对管径DN50，材质Q235，长度300 mm的直管段在40%粗砂体积浓度下的磨损以及粗砂自身磨损情况进行了试验研究。结果发现，同一批次粗砂在4.2 m/s流速下持续对直管段的磨损率随时间呈下降趋势，前8 h的磨损率为1.875 g/（h·m），后2次16 h的磨损率仅为0.52 g/（h·m）和0.42 g/（h·m），经40 h磨损后，粗砂中值粒径由0.82 mm降至0.75 mm；不同批次粗砂在4.2 m/s流速下每8 h对直管段磨损量与时间成线性关系，斜率约为0.518 8，平均磨损率约为1.736 g/（h·m），试验前后粗砂中值粒径基本不变；粗砂对直管段的磨损率随流速增大而增大，在2.2 m/s、3.2 m/s和4.2 m/s流速下的磨损率分别为0.625 g/（h·m）、1.25 g/（h·m）、1.875 g/（h·m），与流速成线性关系，试验前后的粗砂中值粒径基本不变，但在5.2 m/s流速下，直管段磨损率陡增至3.54 g/（h·m），粗砂中值粒径由0.82 mm降至0.72 mm。研究结果可为管道磨损估算，以及管道磨损的数值仿真提供试验数据支撑。更多还原

【Abstract】 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.更多还原