Parametrization of blade leading and trailing edge positions and its influence on mixed-flow pump performance

Hao, Bing; Cao, Shuai

doi:10.1177/0954406213490104

Cited by 9 publications

(8 citation statements)

References 20 publications

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“…The tested mixed-flow pump was designed by the direction and inverse iteration design method [17][18][19][20]. This design method is based on the fluid continuity and motion equations and solves for the meridional velocity taking the effects of the blade shape on the flow into account.…”

Section: Physical Model Of Mixed-flow Pumpmentioning

confidence: 99%

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

et al. 2017

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Tip clearance between blade end and shroud is inevitable in pump operation and of great importance on pump energy performance and pressure fluctuation. As the tip clearance size increases, the head and efficiency of the mixed flow pump drop accordingly. The simulation results show that the development of a leakage vortex is observed as the tip clearance increases, and the trajectory of this leakage vortex remains in the same direction along the blade suction side for different tip clearances. With the increase in tip clearance size, the intensity of the leakage vortex is enhanced, and the separation between the main leakage vortex and the secondary leakage vortex is also strengthened. The leakage separation angle near the blade tip remains at the same value of 10° for different tip clearance sizes. As for the spectrum analysis, the maximum amplitudes of pressure fluctuations dramatically increase in the impeller when the tip clearance increases from 0.0 mm to 1.0 mm, and the dominant frequencies go from 145 Hz to 184 Hz due to the considerable leakage flow.

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Section: Physical Model Of Mixed-flow Pumpmentioning

confidence: 99%

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

et al. 2017

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“…29 To ensure the calculation precision, the second-order center-difference scheme was adopted for the calculation of the pressure term; the second-order upwind scheme 30 was used for the implicit solution of the momentum term and the turbulent viscosity correction. Also, SIMPLEC method was applied on the coupling method of the pressure–velocity, 31 and residual error 10 −5 was used as the criteria of convergence in the calculation.…”

Section: Numerical Methods and Experimental Validationmentioning

confidence: 99%

Design and development of an eco-gate pump installation based on computational fluid dynamics

Chen

Zheng

Zhou

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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To make water in urban rivers flowing and improve water quality, an eco-gate pump unit which uses plate gate as a carrier was designed and developed based on computational fluid dynamics method and the model test in this paper. Firstly, the bidirectional operation energy performance of eco-gate pump was verified by the model test. The results showed that the numerical simulation results were consistent with the model test results with an error of AE2% at the optimum operating condition both in the pumping mode and the powering mode, which verified the reliability and accuracy of numerical stimulation. The major sources of error associated with the power losses were due to the fact that the blade tip leakage and the blade deflection were not considered in computational fluid dynamics simulation. The thickened blade edges also contributed to the differences. On this basis, different schemes of runner blade's setting angles, blade number, blade lean angle, bulb body's length, and shoulder profile line were designed, and their influences on eco-gate pump's performance were analyzed to choose the best runner type and bulb body's profile line through the computational fluid dynamics numerical simulations. The numerical results showed that the eco-gate pump had the best hydraulic performance when the blade's setting angle was ' ¼ 23 , blade number z ¼ 5, blade's lean angle a ¼ 0 and bulb body's shoulder profile line was convex type with length L ¼ 100 mm. The developed pump showed the highest efficiency of 70.95% under the condition of design discharge of 500 L/s and design lift of 1.0 m. Furthermore, the whole flow pattern of the optimized pump was analyzed. Overall, the eco-gate pump presented in this paper can make use of its low-lift pumping function to replenish the target water body more efficient than other similar products. At the same time, it also can utilize the micro-head water energy fully to generate power.

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“…The design of the pump impeller is based on direct inverse design method. [12][13][14] The model and meshes of the pump are shown in Figures 1 and 2, respectively.…”

Section: Parameter Of the Mixed-flow Pump Modelmentioning

confidence: 99%

Pressure fluctuation and flow pattern of a mixed-flow pump with different blade tip clearances under cavitation condition

Tan

Liu

et al. 2017

Advances in Mechanical Engineering

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Cavitation phenomenon has strong transient characteristics and is highly influenced by geometric structure. In this study, the cavitation performance with influence of blade tip clearance for a mixed-flow pump is studied using the renormalization group (RNG) k-e turbulence model and the Zwart-Gerber-Belamri cavitation model. The dominant frequency and maximum amplitude values at non-cavitation condition and different cavitation conditions are compared and associated with flow field features. The results show that the dominant frequency value under incipient cavitation and critical cavitation is 3.2f i and when the cavitation is severe, the frequency value changes to 3.5f i . Then, the influence of tip clearance width on cavitation performance of the mixed-flow pump is also discussed. The results show that the increase in tip clearance will significantly aggravate the performance drop of the pump under cavitation conditions. The critical net positive suction head value increases in 4.79% of the value under no-tip clearance condition. At the same time, by the inner flow field observation and analysis, the morphological of cavitation bubbles is also changed, and the cavitation bubbles tend to attach to the blade suction side and the attachment length increases as the tip clearance increases.

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Parametrization of blade leading and trailing edge positions and its influence on mixed-flow pump performance

Cited by 9 publications

References 20 publications

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

Design and development of an eco-gate pump installation based on computational fluid dynamics

Pressure fluctuation and flow pattern of a mixed-flow pump with different blade tip clearances under cavitation condition

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