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吸入涡形成机理及其对离心泵性能的影响OA北大核心CSTPCD

Formation mechanism of suction vortex and its influence on the performance of centrifugal pumps

中文摘要英文摘要

泵站运行在淹没深度较小工况下进水池内容易产生吸入涡,影响泵站安全稳定运行.为研究离心泵吸入管进口前吸入涡形成机理及其对过流部件的影响,本文采用可视化试验捕捉吸入涡动态发展过程,并结合数值模拟分析了吸入涡的诱因以及对叶轮性能的影响.结果表明:可视化试验验证了数值模拟吸入涡从初生、发展、强化到保持阶段的准确性.在计算工况下,进水池内会产生贯通吸入涡,空气沿"漏斗形"气柱进入吸入管,并以不断脱落的破碎气囊形式持续进入过流部件;吸入涡形成过程是具有一定周期性的能量聚集-维持-耗散过程,主要受大速度梯度影响;吸入涡携气进入吸入管,造成吸入管内部流动紊乱,流速分布均匀度及速度加权平均角均明显降低,导致叶轮轴向均匀入流假设失效,进而影响叶轮内部流动;吸入涡的发展与叶轮功率、效率有明显相关性,在其携气过程中,气相聚集导致叶轮流道内靠近叶片吸力面侧产生低速区,叶片正背面压差明显降低,叶片载荷分布不均,叶轮做功能力降低.

The suction vortex is easy to be generated in the pump sump under the condition of small submerged depth,which affects the safe and stable operation of the pumping station.In order to study the formation mecha-nism of the suction vortex before the inlet of the suction pipe of the centrifugal pump and explore the influence of the suction vortex on the flow components,the visualization test was carried out to capture the dynamic development process of the suction vortex,and the numerical simulation method was carried out to analyze the cause of suction vortex and its effect on impeller performance.The results show that the accuracy of numerical simulation of the suc-tion vortex,including the inception,development,strengthening and retention stages,is verified by visualization experiment.A penetrating suction vortex appears under the calculated condition.The air enters the inlet of the suc-tion pipe in the form of'funnel shape'air core,and continues to enter other flow components in the form of a con-tinuously falling broken airbag.The development of suction vortex is a periodic process accompanied by the collec-tion,maintenance and dissipation of vortex energy,which is mainly affected by the large velocity gradient.The suction vortex carries air into the suction pipe,causing the disordered flow inside the suction pipe.The distortion inflow makes the uniformity of the velocity distribution and the weighted average angle of the velocity decrease obvi-ously,and the assumption of uniform inflow in the axial direction of the impeller fails,which affects the internal flow of the impeller.The development of the suction vortex has a significant correlation with the power and efficien-cy of the impeller.In the process of carrying gas,the accumulation of gas phase leads to a low-speed region near the suction surface of the blade,resulting in a significant decrease in the pressure difference.The load distribution is uneven and the power capacity of the impeller reduces.

高菉浛;冯建军;樊丞;朱国俊;王李科;李晨昊

西安理工大学水利水电学院,陕西西安 710048

能源与动力

吸入涡离心泵气液两相流动能量特性流动特性

suction vortexcentrifugal pumpgas-liquid two-phase flowenergy characteristicsflow characteristics

《水利学报》 2024 (007)

838-847 / 10

国家自然科学基金项目(52079108,52309118);陕西省博士后基金项目(2023BSHEDZZ256,2023BSHEDZZ257)

10.13243/j.cnki.slxb.20230743

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