PIV experiment of the unsteady flow field in mixed-flow pump under part loading condition

Li, Wei; Zhou, Lian; Shi, Weidong; Ji, Leilei; Yang, Yongfei; Zhao, Xiuli

doi:10.1016/j.expthermflusci.2017.01.009

Cited by 60 publications

(19 citation statements)

References 16 publications

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“…Currently, several investigations of impacts of RSI on the pumps performance have been conducted and get some achievements. Li [12] researched the flow field between the impeller outlet and the guide vane inlet under part-load condition based on PIV.…”

Section: Literature Reviewmentioning

confidence: 99%

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Cao

Wei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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In order to analyze the unsteady flow characteristic and the pressure fluctuation features of mixed-flow pump caused by the interaction between the impeller and guide vanes under part-load conditions, the unsteady flow field in the mixed-flow pump was numerically simulated based on the standard k-ε turbulence model. The pressure distribution and the velocity distribution in the rotor-stator interaction (RSI) zones were acquired, and the time domain and frequency domain of the pressure fluctuation were emphatically analyzed. The results showed that the velocity within the rotor-stator interaction zones is mainly affected by the relative position of impeller and guide vane. With the decrease in flow rate condition, the flow fields become more violent and more vortexes generate in the RSI zone, which causes much energy losses. With the rotation of impeller, the vortexes generating from RSI zones move into the guide vane and dissipate in the guide vane passage in the end. The pressure pulsations at various monitoring points fluctuate periodically, and there appear four peak and four trough values with the same number of leaves. The dominant frequency of pressure pulsation was approximate to the impeller blade passing frequency (BPF). Within the rotor-stator interaction zones, the pressure pulsation coefficient in the rotor-stator interaction zone of the mixed-flow pump changes most obviously. The BPF and double and triple frequency of the pressure pulsation are dominant frequencies, and the frequency distribution range is relatively concentrated.

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Section: Literature Reviewmentioning

confidence: 99%

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Cao

Wei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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“…e high-quality solid aluminum oxide was selected as tracer particles for its relatively better fluid following quality, a particle with 20 μm-60 μm diameter and a density of 1050 kg/m 3 . e concentration and distribution of the tracer particles in the fluid are good enough to meet the requirements to obtain the image information of flow field, as shown in Figure 4.…”

Section: Piv Measurement Of Rotor-stator Interaction Flow Fieldmentioning

confidence: 99%

“…Due to the diversity of operating conditions and the change of the system load, the mixed-flow pump often operates at off-design conditions. Working at off-design conditions especially at small flow discharges, the internal flow of the mixed-flow pump becomes more complicated, with the appearance of the backflow and flow separations [1][2][3]. ese unsteady flows bring negative effect to the operating pump, and the most obvious impact is the increase on the shaft system vibration and the periodical radical and axial forces [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Vibration of Shaft System in the Mixed‐Flow Pump Induced by the Rotor‐Stator Interaction under Partial Load Conditions

Wei

Shi

et al. 2018

Shock and Vibration

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In order to reveal the relationship between rotor-stator interaction-induced unsteady flow and the shaft vibration of the mixed-flow pump, PIV (particle image velocimetry) and axis orbit experiments were carried out synchronously in a mixed-flow pump under designed flow rate (1.0Qdes) and the partial load conditions (0.4Qdes and 0.2Qdes). The distribution of the relative velocity and the vorticity in the rotor-stator interaction region at a certain position of the mixed-flow pump impeller was captured; the axis orbit diagram and the time-domain diagram of shaft system were acquired as well. Besides, the waterfall diagrams of the frequency spectrum under different flow rate conditions were compared. The results show that the backflow and the flow separation phenomenon appear in the rotor-stator interaction flow field under the partial load condition, indicating the flow instability. The medium-frequency exciting force and high-frequency exciting force induced by these unstable flows resulting from the rotor-stator interaction are the main factors to intensify the shaft vibration at the power frequency. The rotor-stator interaction under partial load condition is the main reason for the deterioration of shaft system vibration. The 2X frequency also affects the axis orbit in a low level, while other frequencies have less influence on the shaft vibration. The research results can provide the reference and theory instruction for revealing the operating characteristic of mixed-flow pump when it operates under partial load conditions and to reduce or to prevent the deterioration of vibration of shaft system.

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“…Keller et al used PIV to measure the unsteady flow structures in a volute centrifugal pump with high flow rate [18]. Li et al measured and analyzed the unsteady flow field in a mixed-flow pump on Particle Image Velocimetry (PIV) [19]. Zhou et al validated different turbulence models used for numerical simulation of a centrifugal pump diffuser through PIV measuring technology [20].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Dynamics Flow Field of Port Plate Pair of an Axial Piston Pump

et al. 2020

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This paper aims at studying the dynamic fluid evolution process of port plate pair of an axial piston pump. First of all, The Renormalization Group k-ε model (RNG k-ε model) is implemented to simulate the dynamic flow distribution and forecast the evolution of the internal vortex structure inside the valve plate chamber with different speeds of pistons and velocities of inlet fluid by using computational fluid dynamics software. Then, an equivalent amplification test model of a piston-valve plate is built up based on Reynolds similarity theory; the flow state of the piston-valve plate flow field is observed applied the particle image velocimetry (PIV) measuring technique. The resulting uniformity of numerical simulation and PIV measurement verifies that the RNG k-ε model can achieve high-precision prediction for the vortex structure inside the valve plate chamber. Through analysis of velocity contours and streamlines of the flow field, it can be found that vortices with different scales, strengths and positions will occur during the process of fluid distribution, and the scale and strength of the vortex inside the valve plate chamber will be reduced with the increase of the piston’s moving speed, so the energy loss is also reduced and the efficiency is improved.

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PIV experiment of the unsteady flow field in mixed-flow pump under part loading condition

Cited by 60 publications

References 16 publications

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Research of transient rotor–stator interaction effect in a mixed-flow pump under part-load conditions

Vibration of Shaft System in the Mixed‐Flow Pump Induced by the Rotor‐Stator Interaction under Partial Load Conditions

Assessment of the Dynamics Flow Field of Port Plate Pair of an Axial Piston Pump

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