| 引用本文: | 全莉,刘颖,吴泽昊,等.平面S型轴伸贯流泵装置泵内流动特性研究[J].灌溉排水学报,0,():-. |
| Quan Li,Liu Ying,Wu Zehao,et al.平面S型轴伸贯流泵装置泵内流动特性研究[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 本文针对低扬程泵站平面S型泵装置内压力脉动特性和流动稳定性,采用软件CFX开展三维全流道数值模拟。分析了不同流量工况下泵装置内的流动特性、压力脉动和涡量分布特性。结果表明：进水流道内水流流态稳定,流量工况主要影响出水流道内的流动稳定。叶轮内压力脉动激励源为叶轮的旋转作用,在叶轮进口存在叶频的高阶谐波,而叶轮出口高阶谐波幅值较小,导叶出口频率成分复杂,存在明显的低频脉动。进水流道内水流涡量为0,叶轮室、导叶室和出水流道内的涡量差别很大,受到叶轮的旋转扰动叶轮室内和导叶室内流场涡量最大。小流量工况下泵段和出水流道内的涡量差异最大,随着流量的增大涡量减小。涡量分布规律与泵装置内流态变化一致,这从能量的角度解释了前面不同流量工况下流动稳定差异的原因。研究结果对充分了解平面S型泵装置内流动特性和流动稳定机理提供理论指导,对工程运行提供借鉴意义。 |
| 关键词: 平面S型轴伸贯流泵;涡量;压力脉动;流动特性;数值模拟 |
| DOI： |
| 分类号:TK26 |
| 基金项目:江苏省自然科学基金项目（BK20190647） |
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| Study on flow characteristics in plane S-type axial extension tubular pump |
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Quan Li, Liu Ying, Wu Zehao, Yan Jie
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扬州市勘测设计研究院有限公司
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| Abstract: |
| Aiming at the pressure pulsation characteristics and flow stability in the plane S-type pump device of low lift pump station, this paper uses the software CFX to carry out three-dimensional full channel numerical simulation. The flow characteristics, pressure pulsation and vorticity distribution in the pump device under different flow conditions are analyzed. The results show that the flow pattern in the inlet channel is stable, and the flow condition mainly affects the flow stability in the outlet channel. The excitation source of pressure pulsation in the impeller is the rotation of the impeller. There are high-order harmonics of blade frequency at the inlet of the impeller, while the amplitude of high-order harmonics at the outlet of the impeller is small, the frequency component at the outlet of the guide vane is complex, and there are obvious low-frequency pulsations. The flow vorticity in the inlet passage is 0, and the vorticity in the impeller chamber, guide vane chamber and outlet passage is very different. Due to the rotation disturbance of the impeller, the vorticity in the flow field in the impeller chamber and guide vane chamber is the largest. Under the condition of small flow, the difference of vorticity between the pump section and the outlet channel is the largest, and the vorticity decreases with the increase of flow. The law of vorticity distribution is consistent with the change of flow pattern in the pump device, which explains the reason for the difference of flow stability under different flow conditions from the perspective of energy. The research results provide theoretical guidance for fully understanding the flow characteristics and flow stability mechanism in the plane S-type pump device, and provide reference for engineering operation. |
| Key words: Plane S-type axial extension tubular pump; Vorticity; Pressure pulsation; Flow characteristics; numerical simulation |
