Thermodynamic analysis of energy dissipation and unsteady flow characteristic in a centrifugal dredge pump under over-load conditions

Zhao, Xiaoran; Wang, Zhengwei; Xiao, Yexiang; Luo, Yongyao

doi:10.1177/0954406218824350

Cited by 18 publications

(11 citation statements)

References 34 publications

(26 reference statements)

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“…4 Moreover, more researchers combined the CFD method with an experimental method; the researchers used the advantages of the CFD modeling in predicting the performance of a pump and validated these findings through experiments. [5][6][7] Chen et al 8 performed model testing to predict the performance of a tubular ecogate pump with a head of less than 2 m and to verify the accuracy of the numerical simulation. Zhu et al 9 proposed a tubular pump with adjustable guide vanes based on the analysis of defects of fixed guide vanes.…”

Section: Introductionmentioning

confidence: 99%

Multiobjective optimization of a tubular pump to improve the applicable operating head and hydraulic performance

Zhao

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Tubular pumps are widely used in irrigation and water conveyance projects. However, the operating head of most of these pumps is low, and only a few studies have focused on the design of an efficient tubular pump with a head more than 5 m, which is common in long-distance water supply projects. This work aims to improve the operating head and efficiency of tubular pumps while maintaining a low shaft power. The multi-objective orthogonal optimization method was used to determine the critical parameters of the tubular pump, i.e., blade number, airfoil, blade thickness and guide vane distance, and nine design schemes were selected. Next, by using computational fluid dynamics (CFD), a 3D model of the tubular pumps under different schemes was established, and the results were compared. Subsequently, the range method and weighted matrix method were utilized to find the optimized scheme. In addition, an experimental investigation was performed to verify the simulation and the performance of the designed tubular pump. The results indicated that the optimized scheme improved the operating head to 6.9 m with higher efficiency of 84.2% and a lower shaft power of 27.7 kW. The modeling results were in agreement with the experimental measurements, and the designed tubular pump had a wide range of high-efficiency zones.

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Section: Introductionmentioning

confidence: 99%

Multiobjective optimization of a tubular pump to improve the applicable operating head and hydraulic performance

Zhao

Zhang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Similar issues are raised in papers [11,12] devoted to the study on energy dissipation associated with the phenomenon of unsteady fl ow inside the impeller of a centrifugal pump under overload conditions. In this case, a 3D unsteady numerical simulation of the pump was performed using the curvaturecorrected turbulence model SAS SST with the total energy equation.…”

Section: Introductionmentioning

confidence: 63%

Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries

Akanova¹,

Sładkowski²,

Podbolotov³

et al. 2021

Nauk. visn. nat. hirn. univ.

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Purpose. To study hydraulic losses in pumping units during pumping and transportation of liquids, to develop the design and technology solutions to improve the energy efficiency of centrifugal pumps in the mining and oil-producing industries. Methodology. In the theoretical and experimental analysis of hydraulic losses during the transportation of liquids, the hydraulics and experimental analysis methods were used. Findings. As a result of the research carried out, a new design scheme of a multistage centrifugal pump has been developed, providing a coaxial arrangement of impellers, which allows reducing hydraulic losses in pump elements and increasing the energy efficiency of pumping units. Originality. Based on the analysis of existing designs of multistage blowers of axial and centrifugal types, the distribution of hydraulic losses in the elements of a centrifugal blower with coaxial impellers is considered. Experimental dependences on the establishment of pressure flow and power characteristics are presented. Based on the accounting of hydraulic losses, the energy efficiency of the design of the pumping unit with the coaxial arrangement of the impellers was assessed. Practical value. The new design of a centrifugal pump with coaxial impellers reduces hydraulic losses by more than 23% compared to traditional designs of centrifugal pumps. The results of the work can be used by design, research, and industrial organizations engaged in the design and operation of pumping equipment.

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“…The specific entropy difference coefficient Δ C stot can be written as:

where s * is the specific entropy, g is the acceleration of gravity, subscript x 1 and x 2 denotes two locations. If x 1 is the impeller inflow and x 2 is the diffuser outflow, Δ C stot , in the case that temperature changes slightly, can describe the energy loss in the flow passage from impeller inflow to diffuser outflow by considering Δ T ·s * instead of

d s [ 32 ]. Checking Δ C stot can give a better result in predicting the macro energy change in pump.…”

Section: Case Descriptionmentioning

confidence: 99%

Evaluating the Transient Energy Dissipation in a Centrifugal Impeller under Rotor-Stator Interaction

Tao

Zhao

Wang

2019

Entropy

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In fluid machineries, the flow energy dissipates by transforming into internal energy which performs as the temperature changes. The flow-induced noise is another form that flow energy turns into. These energy dissipations are related to the local flow regime but this is not quantitatively clear. In turbomachineries, the flow regime becomes pulsating and much more complex due to rotor-stator interaction. To quantitatively understand the energy dissipations during rotor-stator interaction, the centrifugal air pump with a vaned diffuser is studied based on total energy modeling, turbulence modeling and acoustic analogy method. The numerical method is verified based on experimental data and applied to further simulation and analysis. The diffuser blade leading-edge site is under the influence of impeller trailing-edge wake. The diffuser channel flow is found periodically fluctuating with separations from the blade convex side. Stall vortex is found on the diffuser blade trailing-edge near outlet. High energy loss coefficient sites are found in the undesirable flow regions above. Flow-induced noise is also high in these sites except in the stall vortex. Frequency analyses show that the impeller blade frequency dominates in the diffuser channel flow except in the outlet stall vortexes. These stall vortices keep their own stall frequency which is about 1/5 impeller frequency with high energy loss coefficient but low noise level. Results comparatively prove the energy dissipation mechanism in the centrifugal air pump under rotor-stator interaction. Results also provide the quantitative basis for turbomachinery’s loss reduction design.

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Thermodynamic analysis of energy dissipation and unsteady flow characteristic in a centrifugal dredge pump under over-load conditions

Cited by 18 publications

References 34 publications

Multiobjective optimization of a tubular pump to improve the applicable operating head and hydraulic performance

Multiobjective optimization of a tubular pump to improve the applicable operating head and hydraulic performance

Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries

Evaluating the Transient Energy Dissipation in a Centrifugal Impeller under Rotor-Stator Interaction

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