| 双吸式离心泵叶片吸力面泥沙磨损破坏规律与形成机制研究 |
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| 引用本文： | 张映波,赵子龙,钱忠东.双吸式离心泵叶片吸力面泥沙磨损破坏规律与形成机制研究[J].农业机械学报,2024,55(2):202-207. |
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| 作者姓名： | 张映波 赵子龙 钱忠东 |
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| 作者单位： | 武汉大学水资源工程与调度全国重点实验室 |
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| 基金项目： | 国家自然科学基金项目（52279090） |
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| 摘 要： | 离心泵叶片泥沙磨损是引黄泵站面临的工程难题，采用模型试验及数值模拟相结合的方法，分析了双吸式离心泵叶片出口的磨损破坏规律及其形成机制。采用多层涂层法、丝线法和内窥式成像技术对叶片的磨损特征和近壁面流态进行了分析，并结合数值模拟分析了叶轮流道内的旋涡结构及颗粒轨迹。研究发现：叶片吸力面出口存在左右近似对称的“三角形”磨损破坏区域，该区域存在明显的流动分离；叶轮内的叶道涡和出口回流涡是导致叶片吸力面出口磨损的主要原因。源于叶片压力面进口的叶道涡诱导泥沙颗粒向叶片吸力面出口聚集，造成吸力面出口的集中磨损；叶片吸力面出口附近存在的回流涡诱导颗粒进行轴向旋转运动，加剧叶片吸力面出口的磨损破坏。本研究为双吸式离心泵的抗磨损设计提供了理论支撑。
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| 关 键 词： | 双吸式离心泵 叶片吸力面 泥沙磨损 流场观测 数值模拟 |
| 收稿时间： | 2023/9/28 0:00:00 |
Analysis of Sediment Erosion at Suction Side of Double Suction Centrifugal Pump Blade |
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| ZHANG Yingbo,ZHAO Zilong,QIAN Zhongdong.Analysis of Sediment Erosion at Suction Side of Double Suction Centrifugal Pump Blade[J].Transactions of the Chinese Society of Agricultural Machinery,2024,55(2):202-207. |
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| Authors: | ZHANG Yingbo ZHAO Zilong QIAN Zhongdong |
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| Institution: | Wuhan University |
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| Abstract: | Sediment erosion of centrifugal pump impeller is a major issue of pumping stations on the Yellow River. The sediment erosion at the outlet of the impeller blade suction side of a double-suction centrifugal pump was mainly analyzed by experiments and numerical simulation. In the experiment, the blade sediment erosion was visualized by using the multi-layer coating method and the near-wall flow pattern were observed by the tuft visualization method coupled with the endoscopic imaging technique respectively. The experimental results showed that there were two triangular severe erosion regions symmetrically distributed at the outlet of the suction side of the blade. In the same regions, the flow separation can also be observed clearly. Furthermore, the Euler-Lagrangian method was used to analyze the mechanism for the sediment erosion on the two triangular severe erosion regions. The inter-blade vortex in the pump impeller and the recirculation vortex at the blade outlet were considered responsible for the formation of severe erosion. The inlet-blade vortex can guide sediment particles to aggregate and hit the outlet of the blade suction side. In addition, the recirculation vortex near the outlet of the suction side of the blade made the particles hit the blade repeatedly. Their combined effects lead to severe sediment erosion on the outlet of the blade suction side. The research results can supply theoretical reference for anti-erosion design of centrifugal pump. |
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| Keywords: | double suction centrifugal pump suction side of the blade sediment erosion flow field observation numerical simulation |
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