Showing papers on "Impeller published in 2021"
TL;DR: In this paper, the inter-stage difference of internal flow field distribution and the pressure pulsation characteristics inside a typical three-stage electrical submersible pump was investigated based on numerical simulation and experiment measurement.
67 citations
TL;DR: In this article, a method to predict the production of bio-hydrogen and biogas from the horizontal and vertical continuous mixed tank (HCSTR) and VCSTR (VCSTR) reactors using a numerical approach is presented.
52 citations
TL;DR: In this article, the authors explored the mechanism of internal energy loss in the mixed-flow pump under stall condition based on the SST k-ω turbulence model, identified the vortices in the impeller by the Q-criterion method, and characterized the turbulence intensity by the turbulent kinetic energy (TKE).
49 citations
TL;DR: In this article, the effect of variation in blade thickness of the impeller for the purpose of improving the stall characteristics of the mixed-flow pump was investigated using the entropy generation method that considers the wall effects.
45 citations
TL;DR: In this article, the authors proposed a computational framework for minimizing the stirred-tank reactor power consumption and the impeller equivalent stress using the Computational Fluid Dynamic (CFD) analysis.
40 citations
TL;DR: In this article, the cavitating flow and pressure fluctuation in the tip region were simulated based on Delayed Detached Eddy Simulation (DDES), where high-speed photography and transient pressure measurements were employed to capture the cavitation structures and pressure fluctuations.
38 citations
TL;DR: In this article, the difference in pressure pulsation characteristics between full tubular and axial-flow pumps was investigated using the RNG k-e turbulence model, and the accuracy and reliability of the CFD results were verified by the model test.
37 citations
TL;DR: In this article, a design method of controllable velocity moment in combination of singularity method is proposed for multiphase pump, and the ranges of dimensionless controllability parameters are determined.
33 citations
TL;DR: In this paper, the authors investigate rotating stall characteristics in a centrifugal pump and show that unsteady pressure signals are significantly affected by rotating stall characterized by the increased pulsation amplitude and low frequency components generated in the pressure spectrum.
32 citations
TL;DR: In this paper, an enstrophy dissipation method was used to diagnose where and how hydraulic loss occurs in a pump as turbine (PAT) under different flow conditions, and the energy loss of each part of the PAT was calculated by the enrophy disipation method.
30 citations
TL;DR: In this paper, a large-Eddy simulation is used to investigate the rotor-stator interaction within a centrifugal pump, and the results show that at reduced flow-rates the rotation of the diffuser blades around their mid camber is a better option than rotating them around their leading edge.
TL;DR: In this paper, numerical simulation and experimental research are combined to investigate the influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine.
TL;DR: Reduced blade angles are demonstrated to compensate the adverse effect of positive blade thickness errors and thus enhance the impeller performance robustness against manufacturing uncertainties, and lays a theoretical foundation for the further uncertainty quantification and robust design of advanced centrifugal compressors.
TL;DR: In this article, a vaned diffuser centrifugal pump has been numerically investigated, and the cross-power spectrum method is adopted to identify low-frequency pressure signals, which has been validated by experimental results including flow structures provided by PIV measurements.
TL;DR: In this paper, the behavior of axial flow pump through changing various impeller blade angles is studied and investigated by using a CFD technique, and the results showed that the blade angle does influence the different flow behaviors and features, such as the static pressure, turbulent kinetic energy, pressure fluctuations, axial velocity, radial velocity and tangential velocity.
Abstract: In this work, the behaviors of flow field and pressure fluctuations in both time and frequency domains in an axial flow pump through changing various impeller blade angles are studied and investigated by using a CFD technique. The blade angles are changed between 30°, 45o, 60o and 75o. Numerical results are validated with the experimental values, as a good agreement was found between them. The developed flow analysis shows that the blade angle does influence the different flow behaviors and features, such as the static pressure, turbulent kinetic energy (TKE), pressure fluctuations, axial velocity, radial velocity and tangential velocity. The results have revealed that the TKE rises with flow rate decreases and high static pressure increases at the pump outlet region near the tip blade region. Another conclusion of the study is the fact that the blade angle with 60o is the better one in terms of lower-negative-pressure regions, when compared with the other settings. The first dominated frequency was pump rotational frequency, and the second important frequency is the BPF (blade passing frequency). Furthermore, the results showed that impeller blade angles and unsteady flow have a high influence on the pressure fluctuation amplitude. Moreover, the results of the presented numerical simulation would be useful for a future hydraulic design of an axial pump.
TL;DR: In this paper, the effect of changing the diffuser inlet angle on the overall performance and the pressure fields was investigated, which affect the unsteady loads acting on the pump, as well as vibrations, noise and cavitation phenomena.
TL;DR: In this article, three profiles of sinusoidal tubercle trailing edge (STTE) were designed based on the pectoral fin structure of humpback whales of which the influence on the pressure pulsation of centrifugal pumps was studied via experiment and numerical simulation.
Abstract:
The high-speed rotation of impellers leads to strong rotor–stator interaction, which mainly causes the pressure pulsation of centrifugal pumps. An impeller with a bionic sinusoidal tubercle trailing edge (STTE) can reduce the intensity of the rotor–stator interaction and thus reduce the pressure pulsation of the centrifugal pump. In this study, three profiles of STTE were designed based on the pectoral fin structure of humpback whales of which the influence on the pressure pulsation of centrifugal pumps was studied via experiment and numerical simulation. Results show that a reasonable design of STTE can effectively eliminate the high-frequency pressure pulsation in the rotor–stator interaction region of the centrifugal pump. The use of STTE2 and STTE3 profiles affect the amplitude reduction of pressure pulsation at the blade passing frequency (fBPF). Compared with the impeller without the STTE profile, the amplitudes of pressure pulsation with STTE2 and STTE3 profiles are decreased by 47.10% and 44.20% at the pump discharge, while the decrease, at the volute throat is 30.36% and 25.97%, respectively. Detailed flow structures inside the pump show that the STTE profile can inhibit the vortex generation at the blade trailing edge, and the local high-intensity pressure pulsation can be reasonably avoided. This study helps improve the pressure pulsation characteristic of centrifugal pumps and their operation stability.
TL;DR: In this article, the Eulerian-Eulerian mixture model was used to simulate the solid-liquid two-phase flow of quartz sand and water in a slurry pump.
TL;DR: In this article, a typical flow condition adopted in industrial multiple impeller fermenters is investigated, that leads to gas accumulation on the rear of flat blades, a reduction of the power transferred to the fluid and limitations of the volumetric mass transfer coefficient.
TL;DR: The dominant vortex structure near the hub in rotor corner separation flow has an important influence on the internal flow of the axial flow rotating machinery as mentioned in this paper, however, the current quantitative re...
Abstract: The dominant vortex structure near the hub in rotor corner separation flow has an important influence on the internal flow of the axial flow rotating machinery. However, the current quantitative re...
TL;DR: In this article, the transient cavitating flows in a waterjet pump are numerically investigated under a non-uniform inflow for the purpose of revealing the correlation mechanism between the cavitation and the vorticity diffusion as well as the exited pressure fluctuations.
TL;DR: In this paper, the authors applied the Spectral Kurtosis tool in order to detect the impulsive shock waves generated during the implosion of vapour bubbles in hydraulic turbomachinery.
TL;DR: In this paper, numerical simulation and experimental verification of different guide vane clocking positions are carried out to study the influence of clocking effects on the hydraulic performance of the pump as turbine (PAT).
TL;DR: In this paper, CFD simulations have been conducted to investigate flow behaviour of water in a fully baffled stirred tank with Rushton turbine as impeller, and the aim of the paper is to develop CFD model.
Abstract: In this work, CFD simulations have been conducted to investigate flow behaviour of water in fully baffled stirred tank with Rushton turbine as impeller. The aim of the paper is to develop CFD model...
TL;DR: In this paper, a three-dimensional (3D) unsteady numerical modeling of a centrifugal slurry pump with Eulerian-Lagrangian approach coupled with the erosion model has been performed to predict the erosive wear of the pump components namely, casing and impeller.
Abstract:
Centrifugal slurry pump designed for handling solid–liquid flow experiences performance reduction and shorter service life due to uneven localized erosive wear of the wetted parts. In this work, three-dimensional (3D) unsteady numerical modeling of a centrifugal slurry pump with Eulerian–Lagrangian approach coupled to the erosion model has been performed to predict the erosive wear of the pump components namely, casing and impeller. The erosion model developed to predict the erosion of the pump components of high chromium white cast iron (HCWCI) is employed, and the erosion rate distribution along the complete length and width of the casing and impeller blade surfaces namely, pressure side, suction side, front shroud, and back shroud, is determined. The numerical results showed good agreement with the experimentally measured erosion of the pump casing. It has been found that the erosion of the casing and impeller is non-uniform along the length and width. The zone of higher erosion is at the centerline and the back side of the casing, whereas, for the impeller, it is on the pressure side near the leading edge. The variation in the operating flowrate and particle size greatly influenced the material removal rate and the zone of higher erosion for the casing and impeller blade surfaces.
TL;DR: It is ascertained that ribbon impeller was proficient for high-solid anaerobic digestion and it will prominently benefit future system designs.
TL;DR: In this paper, a numerical equation of the internal flow channel of the TSEAC (Two-stage Electric Air Compressor) was established, and the validity of the numerical equation was verified by the experimental study, which showed that the heat generated by the electric air compressor for the PEMFC is 2-4 times higher than that of the turbocharger for a traditional diesel engine.
TL;DR: In this article, a numerical model is used to study the cavitation performance of a radial flow centrifugal pump with a semi open impeller, and the effects of the blade tip clearance and its thickness on the onset and development of cavitation at the suction side of the impeller are presented and analyzed.
01 Sep 2021
01 Mar 2021
TL;DR: Partial emission pumps or open impeller pumps or tangent pumps with very low specific speed at either fast or conventional speed have found extensive applications in aircraft, liquid rockets, and cryogenic research as discussed by the authors.
Abstract: Partial emission pumps or open impeller pumps or tangent pumps with very low specific speed at either fast or conventional speed have found extensive applications in aircraft, liquid rockets, cryog...