Blade Interaction Forces in a Mixed-Flow Pump With Vaned Diffuser
Blade Interaction Forces in a Mixed-Flow Pump With Vaned Diffuser
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DOI：
10.1115/fedsm2009-78114
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发表时间：
2009
影响因子：
1.7
通讯作者：
V. Esch;L. Cheng
中科院分区：
文献类型：
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作者：
V. Esch;L. Cheng
涡轮机械中的流体动力可能会导致过度磨损和振动等问题。在流体引起的力的许多不同原因中，叶片相互作用引起的来源可能是最好的研究。然而，大多数研究都集中在高扬程泵上。本文介绍了带叶片扩压器的混流泵中叶片相互作用力的研究。它涵盖了实验和数值结果。混流泵内置于闭环测试装置中。为了测量叶轮上的瞬时力和弯矩，使用了内置于叶轮和泵轴之间的同向旋转测功机。事实证明，为了确定轴系统的动态行为，需要进行广泛的校准。叶片通过频率下的力测量显示出对流速的意外依赖性。另一个重要的观察结果是叶片激振力导致叶轮沿与轴旋转相反的方向旋转。使用 FLUENT® 将测量结果与非稳态 CFD 计算进行比较。计算的全局特性与测量结果非常吻合。叶片相互作用力的大小也显示出良好的定性一致性。在较大的流速范围内，大小对流速的依赖性与测量中发现的趋势非常吻合。对偏差进行了解释。版权所有 © 2009 by ASME
Hydrodynamic forces in turbomachinery can cause problems ranging from excessive wear to vibrations. Of the many different causes of fluid-induced forces, their source attributed to blade interaction is perhaps best studied. Most studies, however, focus on high head pumps. This paper presents a study of blade interaction forces in a mixed-flow pump with vaned diffuser. It covers both experimental and numerical results. A mixed-flow pump is built into a closed-loop test rig. In order to measure the instantaneous forces and bending moments on the impeller, a co-rotating dynamometer is used, which is built in-between the impeller and the shaft of the pump. Extensive calibration proved necessary to determine the dynamic behavior of the shaft system. Measurements of forces at blade passing frequency show an unexpected dependency on flow rate. Another important observation is that blade excitation forces cause the impeller to whirl in a direction opposite to shaft rotation. Results of measurements are compared with unsteady CFD calculations using FLUENT® . Computed global characteristics show a good agreement with measurements. Also the magnitude of blade interaction forces shows a good qualitative agreement. Over a large range of flow rates, the dependency of magnitude on flow rate agrees well with the trend found in the measurements. Deviations are explained.Copyright © 2009 by ASME