沙粒质量分数对油气混输泵过流部件磨损的影响

Effect of sand mass fraction on wear of flow passage components in oil-gas multi-phase pump

为研究沙粒质量分数对油气混输泵过流部件磨损的影响规律,基于DPM模型对油气混输泵内部的沙粒运动进行数值计算,并采用Finnie磨蚀模型计算油气混输泵过流部件的磨蚀率.研究结果表明:在沙粒质量分数较小时,沙粒与流体介质混合均匀;随着沙粒质量分数的增大,增压单元内的沙粒局部质量浓度显著增大,沙粒集中在叶轮压力面及导叶流道中部;沙粒质量分数增大会使磨损区域和磨损率急剧增大;在叶轮域中,磨损首先发生在压力面出口处,吸力面则在进口外缘发生点状和条状磨损;在导叶域中,压力面的磨损主要发生在外缘处,吸力面的磨损主要发生在进口轮毂处;从定量分析看,叶轮叶片表面的磨蚀率普遍大于导叶叶片表面的磨蚀率,磨损最严重的位置为叶轮叶片进口靠近轮毂处.研究结果可为改善油气混输泵抗磨损性能以及提高油气混输泵实际运行寿命提供一定参考依据.

In order to study the influence of sand mass fraction on the wear of the flow passage components of the oil-gas multi-phase pump,the sand movement inside the oil-gas multi-phase pump was numerically calculated based on the DPM model,and the Finnie erosion model was used to calculate the wear rate of the flow passage components of the oil-gas multi-phase pump.The results show that when the sand mass fraction is small,the sand particles and the fluid medium are mixed evenly.With the increase of sand mass fraction,the local concentration of sand particles in the pressurization unit significantly increases.The sand particles are concentrated on the pressure surface of the impeller and the middle of the diffuser channel.An increase of sand mass fraction will increase the wear area and wear rate sharply.In the impeller domain,the wear first occurs at the outlet of the pressure surface,and the suction surface undergoes punctate and strip wear at the outer edge of the inlet.In the diffuser domain,the wear of the pressure surface mainly occurs at the outer edge,and the wear of the suction surface mainly occurs at the inlet hub.From the quantitative analysis perspective,the wear rate of the impeller blade surface is generally greater than the wear rate of the diffuser blade surface,and the most serious wear position is the impeller blade inlet near the hub.The research results can provide some reference for improving the anti-wear performance of oil-gas multi-phase pump and improving the actual operating life of oil-gas multi-phase pumps.