Influence of T-shape tip clearance on performance of a mixed-flow pump

Tan, Lei; Xie, Zhihui; Liu, Yabin; Hao, Yong Ping; Xu, Ye

doi:10.1177/0957650917733129

Cited by 66 publications

(22 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hao [8] studied the transient cavitating flows of a mixed-flow PAT (pump as turbine) at pump mode experimentally and numerically. Tan [9,10] investigated the role of blade rotational angle in the energy performance and pressure fluctuation and the influence of original and T-shape blade end on performance of a mixed-flow pump through an experimental measurement and numerical simulation, respectively.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

To investigate the unsteady flow characteristics and their influence mechanism in the volute of centrifugal pump, the Reynolds time-averaged N-S equation, RNG k-ε turbulence model, and structured grid technique are used to numerically analyze the transient flow-field characteristics inside the centrifugal pump volute. Based on the quantified parameters of flow field in the volute of centrifugal pump, the velocity mode contours and oscillation characteristics of the mid-span section of the volute of centrifugal pump are obtained by dynamic mode decomposition (DMD) for the nominal and low flow-rate condition. The research shows that the first-order average flow mode extracted by DMD is the dominant flow structure in the flow field of the volute. The second-order and third-order modes are the most important oscillation modes causing unsteady flow in the volute, and the characteristic frequency of the two modes is consistent with the blade passing frequency and the 2x blade passing frequency obtained by the fast Fourier transform (FFT). By reconstructing the internal flow field of the volute with the blade passing frequency for the nominal flow-rate condition, the periodic variation of the unsteady flow structure in the volute under this frequency is visually reproduced, which provides some ideas for the study of the unsteady structure in the internal flow field of centrifugal pumps.

show abstract

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…They showed that axial power, pressure, and liquid phase volume fractions fluctuated during the experiment. Tan et al [12] studied the T-shaped blade pressure pulsation under mixed flow and discovered that the pressure fluctuation amplitude was the largest at the blade head. Moreover, the effects of the blade setting angle and tip clearance on pressure fluctuation and flow law were studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of Gas-Volume Fractions on the External Characteristics and Pressure Fluctuation of a Multistage Mixed-Transport Pump

Luo

Feng

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

In the petroleum industry, multiphase transport pumps are a crucial technology for petroleum extraction. Therefore, the pressure fluctuation and internal-flow characteristics of multiphase transport pumps with different inlet-gas-volume fractions (IGVFs) have become an important research topic. Studying the pressure fluctuation and its effects on the performance of mixed-transport pumps under different IGVFs is significant for improving the running stability of pumps. In this work, steady and transient flow with different IGVFs was solved using the Navier–Stokes equation applied to a structured grid and the Shear Stress Transport (SST) turbulence model. The effects of IGVFs on the pressure pulsation and the performance of a three-stage, mixed-transport pump were studied. Results indicated that the numerical calculation results agreed well with the experimental data. The numerical method could predict the gas and liquid two-phase flow in the mixed-transport pump accurately. The pressure increase of this pump decreased with the increased flow quantity and the IGVFs. The efficiency improvement of the pump was limited by the increasing the flow rate. Under the rated-flow condition, a quantitative relationship was established between the relative discharge of the IGVF and the decrease in the pump head; when the IGVF exceeded 15%, the pressurization capacity decreased by more than 30%. Along the blade centerline direction, the pressure fluctuation amplitude near the suction surface of the impeller blade head gradually increased. Numerical simulation results showed that the dominant frequency of the pressure fluctuation of the impeller and diffuser was ten and seven times that of the rotation frequency, respectively. Thus, the IGVFs greatly influenced the dominant frequency of the pressure fluctuation. The air in the impeller primarily piled up at the suction surface of the blade head near the front cover. Under a centrifugal force, water was pushed to the back cover plate, making the gas-volume fraction near the front cover plate higher. Consequently, the distribution of gas content in the impeller became uneven. On the blade suction surface near the front cover plate, a low-velocity area caused by flow separation was generated, which further affected the pressure pulsation in the impeller. There were obvious vortices in the diffuser, and the vortex position had a tendency to move toward the inlet of the diffuser with an increased gas content. The flow pattern in the impeller was consistent, which indicated the great transport performance of this pump. In conclusion, through numerical simulation and experimental research, this study revealed the effects of the IGVFs on the performance and pressure pulsation of a mixed-transport pump under a gas–liquid two-phase flow condition. Our findings may serve as a guide for the optimization of a multiphase pump.

show abstract

“…With the development of computational fluid dynamics, more and more researchers predicted the internal flow and pressure fluctuation in pumps by numerical simulation. New calculation models and numerical methods have been developed and verified [3][4][5][6]. The results from numerical simulation can reveal detailed fluid information in impeller and volute, including pressure and streamline distributions, which are difficult to obtain in experiments.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

et al. 2019

View full text Add to dashboard Cite

As an important type of centrifugal pump, the double-suction pump has been widely used due to its high efficiency region and large flow rate. In the present study, the complex flow in volute of a double-suction centrifugal pump is investigated by numerical simulation using a re-normalization group (RNG) k-ε model with experimental validation. Axial flows are observed in volute near the impeller outlet and compared with four staggered angles. The net area-weighted average axial velocities decrease as the staggered angle increases. The axial flows are mainly caused by the different circumferential pressure distribution at the twin impeller outlet. The dominant frequencies of the axial velocities for different staggered angles are fBP and its harmonic. The pressure fluctuations in most regions of the volute are obtained by superimposing the pressure generated by the two impellers.

show abstract

Influence of T-shape tip clearance on performance of a mixed-flow pump

Cited by 66 publications

References 39 publications

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

Study on Flow Characteristics in Volute of Centrifugal Pump Based on Dynamic Mode Decomposition

Effects of Gas-Volume Fractions on the External Characteristics and Pressure Fluctuation of a Multistage Mixed-Transport Pump

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

Contact Info

Product

Resources

About