Optical PIV and LDV Comparisons of Internal Flow Investigations in SHF Impeller

Abstract

The paper presents a comparison between two sets of experimental results in a centrifugal flow pump. The tested impeller is the so-called SHF impeller for which many experimental data have been continuously produced to built databases for CFD code validations with various levels of approximation. Measurements have been performed using optical techniques: 2D particle image velocimetry (PIV) technique on an air test model and 2D laser doppler velocimetry (LDV) technique on a water model, both for different flow rates. For the present study, results obtained by these optical techniques are compared together in terms of phase averaged velocity and velocity fluctuations inside the impeller flow passage for design flow rate.

Research on Axial-Flow Pump Inlet Velocity Field and Pump Flow at Different Operating Condition

“…介绍了利用 LDV 测量离心泵蜗壳流道 内部速度场时均速度与流量两种校核方法；杨昌明 [6] 采用 LDV 对轴流泵叶轮内部及进出口旋转流场进行 了流动测量研究； Nicholas Pedersen [7] 利用 PIV 和 LDV 测试不同工况下离心泵叶轮内流场；Wuibaut G [8] 对离 心叶轮内部流场分别进行 PIV 和 LDV 测试，并进行 比较分析；Takayuki Matsunuma [9] 用 LDV 对低雷诺数 下轴流式水轮机非定常流场进行了测试；金燕 …”

Inverse-design and optimization methods for centrifugal pump impellers

“…C.3. Furthermore, Wuibaut et al [77,78] also report the existence of a wake region near the shroud suction side for the radial SHF impeller, both for PIV experiments in air and for LDV measurements in water (see Fig. C.5).…”

“…This impeller was originally designed by the Société Hydrotechnique de France in order to study inlet and outlet recirculation in centrifugal pumps at off-design conditions. It is still used as a reference case for experimental and numerical research (for example in Wuibaut et al [77,78]). …”

“…low values of the relative velocity at pressure side and high values of the relative velocity at the suction side of the blades. Wuibaut et al performed PIV measurements in the radial SHF impeller in air [77,78]. In these papers the focus is on PIV measurements in the outer part of the impeller and in the diffuser.…”

“…C.4. Wuibaut et al [78] executed LDV measurements in water and PIV measurements in air in the radial SHF impeller. The resulting velocity profiles at r/r te = 0.818 are shown in Fig.…”