PIV Measurements in the Impeller and the Vaneless Diffuser of a Radial Flow Pump in Design and Off-Design Operating Conditions
PIV Measurements in the Impeller and the Vaneless Diffuser of a Radial Flow Pump in Design and Off-Design Operating Conditions
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DOI：
10.1115/1.1486473
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发表时间：
2002-09
影响因子：
2
通讯作者：
G. Wuibaut;G. Bois;P. Dupont;G. Caignaert;M. Stanislas
中科院分区：
文献类型：
--
作者：
G. Wuibaut;G. Bois;P. Dupont;G. Caignaert;M. Stanislas
本文介绍并讨论了在径流泵空气试验台上进行的试验方案的结果。所测试的叶轮是所谓的SHF叶轮。许多实验数据已经产生（在空气中和水中的测试）的几何形状和这些结果仍然被用作数据库的CFD代码的验证。对于本研究，空气测试台已被选择为光学接入设施和测量实现与无叶扩散。二维粒子图像测速技术已被使用，并已同时在叶轮的外部和无叶扩压器中的流速测量。在五个平面上，在轮毂到护罩方向上，对各种相对流速（设计和非设计工况）进行了测量。首先，本文着重研究了叶轮和扩压器内相平均速度图的演变过程。相位平均技术的局限性在非常低的部分流率中清楚地显现出来，这将与先前的压力测量分析有关，该压力测量分析确定了在这种操作条件下叶轮内旋转失速的发生。本文还提出了一种分析的速度图的波动率和演变的各个测量平面的相对流量变得更低。
This paper presents and discusses the results of an experimental program that has been made on an air test rig of a radial flow pump. The tested impeller is the so-called SHF impeller. Many experimental data have already been produced (tests in air and in water) on that geometry and these results are still used as databases for the validation of CFD codes. For the present study, an air test rig has been chosen for optical access facilities and measurements were realized with a vaneless diffuser. The 2D Particle Image Velocimetry technique has been used and measurements of flow velocities have been made simultaneously in the outer part of the impeller and in the vaneless diffuser. Measurements have been realized in five planes, in the hub to shroud direction, for various relative flow rates (design and off-design operating conditions). First, the paper focus on the evolutions of the phase averaged velocity charts in the impeller and the diffuser. Limitations of the phase averaging technique clearly appear in the very low partial flow rates and this will be related to previous pressure measurements analysis establishing the occurrence of rotating stall within the impeller for such operating conditions. The paper also proposes an analysis of the rates of fluctuations of the velocity charts and the evolutions in the various measuring planes as the relative flow rate becomes lower.