Effect of Blade Outlet Angle on Unsteady Hydrodynamic Force of Closed-Type Centrifugal Pump with Single Blade
Effect of Blade Outlet Angle on Unsteady Hydrodynamic Force of Closed-Type Centrifugal Pump with Single Blade
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DOI：
10.1155/2014/838627
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发表时间：
2014-01-01
影响因子：
0.9
通讯作者：
Fukutomi, Junichiro
中科院分区：
文献类型：
--
作者：
Nishi, Yasuyuki;Fukutomi, Junichiro
在几何上，目前通常用作污水泵的单叶片离心叶轮不是轴向对称的。因此，当叶轮旋转时，叶轮周围的静压波动很大，不仅径向推力而且轴向推力也表现出很大的波动。因此，定量地掌握这些波动水动力对提高泵的可靠性是极其重要的。在这项研究中，我们研究了非定常水动力在一个封闭式离心泵与一个单一的叶片不同的叶片出口角使用的数值分析，同时考虑到实验和泄漏流。结果清楚地显示了叶片出口角对作用在叶轮上的力的影响。在低流速下，无论哪种叶轮，总径向推力波动分量的均方根值大致相同，但在高流速下，叶片出口角较大的叶轮的均方根值增加。此外，当泄漏流量随着叶轮周围静压的增加而增加时，使得后护罩部分和前护罩部分经受高压，这两个部分上的轴向推力的绝对值增加。
Geometrically, the single-blade centrifugal impeller, commonly used today as a sewage pump, is not axially symmetric. For this reason, the static pressure around the impeller fluctuates greatly when the impeller is rotating, and not only the radial thrust but also the axial thrust shows large fluctuations. Therefore, it is extremely important for the improvement of pump reliability to quantitatively grasp these fluctuating hydrodynamic forces. In this study, we investigated the unsteady hydrodynamic forces in a closed-type centrifugal pump with a single blade for different blade outlet angles using a numerical analysis that takes into account both experiment and the leakage flow. The results clearly showed the effect of the blade outlet angle on that act on the impeller. The root-mean-square value of the fluctuating component of the total radial thrust was roughly the same for whichever impeller at low flow rate, but at high flow rates, the value increased for impellers with larger blade outlet angles. Moreover, when the leakage flow rate increased with increasing static pressure around the impeller, such that the rear and front shroud parts were subject to high pressure, the absolute value of the axial thrust on both these parts increased.