Effects of Volute Curvature on Performance of a Low Specific-Speed Centrifugal Pump at Design and Off-Design Conditions
Effects of Volute Curvature on Performance of a Low Specific-Speed Centrifugal Pump at Design and Off-Design Conditions
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DOI：
10.1115/1.4028766
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发表时间：
2015-04-01
影响因子：
1.7
通讯作者：
Najafi, Amir Farhad
中科院分区：
文献类型：
--
作者：
Alemi, Hamed;Nourbakhsh, Seyyed Ahmad;Najafi, Amir Farhad
针对非设计工况，研究了蜗壳几何形状对低比转速离心泵扬程、效率和径向力的影响。本文分为三个部分。在第一部分中，使用三种著名的湍流模型对具有矩形蜗壳的泵内部的三维流动进行了模拟。模拟结果与现有的实验数据进行了比较，并取得了可接受的一致性。在第二部分中，研究了两种蜗壳设计方法，即等速度法和等角动量法。所得结果表明，一般来说等速度法能提供更令人满意的性能。在第三部分中，设计了三种具有不同横截面和扩散器形状的蜗壳。总体而言，发现具有径向扩散器的圆形横截面蜗壳可提供更高的扬程和效率。此外，与矩形横截面蜗壳相比，圆形蜗壳几何形状中的最小径向力出现在较高流量时。
The effects of the volute geometry on the head, efficiency, and radial force of a low specific-speed centrifugal pump were investigated focusing on off-design conditions. This paper is divided into three parts. In the first part, the three-dimensional flow inside the pump with rectangular volute was simulated using three well-known turbulence models. Simulation results were compared with the available experimental data, and an acceptable agreement was obtained. In the second part, two volute design methods, namely, the constant velocity and the constant angular momentum were investigated. Obtained results showed that in general the constant velocity method gives more satisfactory performance. In the third part, three volutes with different cross section and diffuser shape were designed. In general, it was found that circular cross section volute with radial diffuser provides higher head and efficiency. Moreover, the minimum radial force occurs at higher flowrate in circular volute geometry comparing to rectangular cross section volute.