Experimental analysis of flow structure in contra-rotating axial flow pump designed with different rotational speed concept

Cao, Linlin; Watanabe, Satoshi; Imanishi, Toshiki; Yoshimura, Hidetoshi; Furukawa, Akinori

doi:10.1007/s11630-013-0634-x

Cited by 16 publications

(10 citation statements)

References 4 publications

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“…Yun JE [19] studied the impact loss at the inlet of rotor blades and obtained the optimal design of a blade shape by numerical analysis and optimization. Some studies [20,21] have adopted optimization design methods to achieve improved cavitation and good hydraulic performance of axial-flow pumps. Numerous studies have shown that the numerical simulation method has become the most important research method in the field of pumps.…”

Section: Introductionmentioning

confidence: 99%

Multi-Disciplinary Optimization Design of Axial-Flow Pump Impellers Based on the Approximation Model

et al. 2020

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This study adopts a multi-disciplinary optimization design method based on an approximation model to improve the comprehensive performance of axial-flow pump impellers and fully consider the interaction and mutual influences of the hydraulic and structural designs. The lightweight research on axial-flow pump impellers takes the blade mass and efficiency of the design condition as the objective functions and the head, efficiency, maximum stress value, and maximum deformation value under small flow condition as constraints. In the optimization process, the head of the design condition remains unchanged or varies in a small range. Results show that the mass of a single blade was reduced from 0.947 to 0.848 kg, reaching a decrease of 10.47%, and the efficiency of the design condition increased from 93.91% to 94.49%, with an increase rate of 0.61%. Accordingly, the optimization effect was evident. In addition, the error between the approximate model results and calculation results of each response was within 0.5%, except for the maximum stress value. This outcome shows that the accuracy of the approximate model was high, and the analysis result is reliable. The results provide guidance for the optimal design of axial-flow pump impellers.

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Section: Introductionmentioning

confidence: 99%

Multi-Disciplinary Optimization Design of Axial-Flow Pump Impellers Based on the Approximation Model

et al. 2020

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“…The solid concentration distribution at the outlets, which can represent uniform distribution − of the solid phase in the filter cake and the filtrate, is another evaluation index of the handling ability of the decanter centrifuge. Figures and show the solid-phase concentration distribution of the outlets at 10 s of centrifuge operation.…”

Section: Results Of the Simulationmentioning

confidence: 99%

Experimental and Numerical Study of the Solid Concentration Distribution in a Horizontal Screw Decanter Centrifuge

Zhu

Tan

et al. 2013

Ind. Eng. Chem. Res.

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The horizontal screw decanter centrifuge is an automatic and continuous settlement centrifuge; it is widely used in different industries. Within the centrifuge, the drum and screwpropeller rotate at different speeds in the same direction, and therefore, the fluid flow state is extremely complex. There is no theoretical method to describe the solid concentration distribution during the filtration separation process. Therefore, FLUENT software was applied to an M-2301-type horizontal screw decanter centrifuge to simulate the fluid flow situation in the centrifuge drum and obtain the solid concentration distribution. The simulation results showed that the solid volume fraction could reach 66.35 and 4.92% at the sediment outlet and the overflow outlet after 10 s of simulation, respectively, and it was in good agreement with the industrial experimental results. The research shows that the 3-D unsteady calculation combined with moving mesh is an effective technique to investigate solid concentration distributions in the decanter centrifuge. Furthermore, the input concentration, which affected the solid distribution and flow integrity in the drum, was analyzed. The results show that the horizontal screw decanter centrifuge can effectively handle high solid content suspensions.

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“…3, it is clear that the newly designed rotor pair RR3 highly satisfies the design specification (H=4mat Q=70L/s) with a relatively higher efficiency, and appears with superior hydraulic head in a large flow rate range (Q>28L/s). In the rather lower flow rate range (Q≤28L/s), it suffers from a more pronounced positive slope on its hydraulic head curve, which is believed to be induced by the severe separation in the rear rotor's boundary layer under overwhelming adverse pressure gradient [16]. …”

Section: Fig 2 Hub and Tip Blade Profiles For Two Contra-rotating Romentioning

confidence: 99%

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

Cao

Watanabe

Honda

et al. 2014

International Journal of Fluid Machinery and Systems

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As a high specific speed pump, the contra-rotating axial flow pump with two rotors rotating reversely has been proved with higher hydraulic and cavitation performance, while in our previous researches, the potential interaction between two blade rows was distinctly observed for our prototype rotors designed with equal rotational speed for both front and rear rotors. Based on the theoretical and experimental evidences, a rotational speed optimization methodology was proposed and applied in the design of a new combination of contra-rotating rotors, primarily in expectation of the optimized blade pressure distributions as well as pertinently improved hydraulic performances including cavitation performance. In the present study, given one stationary and two rotating frames in the contra-rotating rotors case, a pressure measurement concept taking account of the revolutions of both front and rear rotors simultaneously was adopted. The casing wall pressure data sampled in time domain was successfully transferred into space domain, by which the ensemble averaged blade-to-blade pressure distributions at the blade tip of two contra-rotating rotors under different operation conditions were studied. It could be seen that the rotor pair with the optimized rotational speed combination as well as work division, shows more reasonable blade-to-blade pressure distribution and well weakened potential interaction. Moreover, combining the loading curves estimated by the measured casing wall pressure, the cavitation performance of the rotor pairs with new rotational speed combination were proved to be superior to those of the prototype pairs.

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Experimental analysis of flow structure in contra-rotating axial flow pump designed with different rotational speed concept

Cited by 16 publications

References 4 publications

Multi-Disciplinary Optimization Design of Axial-Flow Pump Impellers Based on the Approximation Model

Multi-Disciplinary Optimization Design of Axial-Flow Pump Impellers Based on the Approximation Model

Experimental and Numerical Study of the Solid Concentration Distribution in a Horizontal Screw Decanter Centrifuge

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

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