Influence of Splitter Blades on the Cavitation Performance of a Double Suction Centrifugal Pump

Yang, Wei; Xiao, Ruofu; Wang, Fujun; Wu, Yulin

doi:10.1155/2014/963197

Cited by 21 publications

(18 citation statements)

References 13 publications

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“…Full-length blades impeller Yang et al [9] compared the cavitating performance of two impellers, the baseline one having six full-length blades and the other designed with four splitter blades and four full-length blades. The splittered impeller maintains the same meridional geometry of the baseline one and the blades have the same shape.…”

Section: Splittered Impellermentioning

confidence: 99%

“…In conclusion, a large body of work exists on the effect of splitter blades on wet and cavitating pump performance [7,8,9,12], but a study conducting an optimization of the most important design parameters for splitter blades with the objective of extending the operational range under cavitation has not been performed. Splitter blades are often designed by simply adding short blades with the same shape as the main blades, greatly limiting their effectiveness and modifying the blade loading distribution and the head-capacity curve, as Cavazzini points out [17].…”

Section: Splittered Impellermentioning

confidence: 99%

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Design Optimization of Splitter Blades for Rocket Engine Turbopump

Torre

Konno

Lettieri

et al. 2018

Volume 2D: Turbomachinery

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In this paper we present and validate a shape optimization framework for the design of splitter blades that extends the operative range under cavitation while maintaining the wetted performance of rocket engine turbopumps. For a target turbopump application, the optimization framework allows for independent changes to the blade angle distributions across the span and to the pitchwise position of the splitter blades while preserving the thickness distributions. The optimization is conducted with a surrogate-based gradient method. The geometry is optimized at a fixed cavitation number corresponding to a 5% head coefficient dropoff, while constraints are imposed on the wet pump performance. It is found that this approach, coupled with the optimal design points distribution provided by the Design of Experiment method, reduces the computational cost of the optimization process by minimizing the number of multiphase calculations. The numerical results suggest that the optimized splitter blades successfully increase the pump operative range by 2.2% and increase the head coefficient by 5.3% compared to the baseline case with non-optimized splitters. These results are corroborated by experiments conducted in a closed-loop water test facility. Several pump geometries are tested through rapid prototyping using additive manufacturing. The experimental data validate the optimization framework, demonstrating a 4.7% increase of pump operative range and a 7.6% increase in head coefficient. The calculations are used to gain insight in the physical mechanisms for the performance improvement. The analysis of the results indicates that the improved performance is due to the optimized position and shape of the splitter blades which increase the pump slip factor.

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Section: Splittered Impellermentioning

confidence: 99%

Section: Splittered Impellermentioning

confidence: 99%

Design Optimization of Splitter Blades for Rocket Engine Turbopump

Torre

Konno

Lettieri

et al. 2018

Volume 2D: Turbomachinery

View full text Add to dashboard Cite

show abstract

“…Symmetry 2019, 11, x FOR PEER REVIEW 2 of 12 the low-pressure region inside the rope can be effectively diminished. Yang et al [12] applied eight alternating long and short blades, instead of the original six same-length blades, in a centrifugal pump. This enlarged the original passing area, making it have a relatively higher pressure than before.…”

Section: Introductionmentioning

confidence: 99%

Anti-Cavitation Design of the Symmetric Leading-Edge Shape of Mixed-Flow Pump Impeller Blades

2019

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Mixed-flow pumps compromise large flow rate and high head in fluid transferring. Long-axis mixed-flow pumps with radial–axial “spacing” guide vanes are usually installed deeply under water and suffer strong cavitation due to strong environmental pressure drops. In this case, a strategy combining the Diffusion-Angle Integral Design method, the Genetic Algorithm, and the Computational Fluid Dynamics method was used for optimizing the mixed-flow pump impeller. The Diffusion-Angle Integral Design method was used to parameterize the leading-edge geometry. The Genetic Algorithm was used to search for the optimal sample. The Computational Fluid Dynamics method was used for predicting the cavitation performance and head–efficiency performance of all the samples. The optimization designs quickly converged and got an optimal sample. This had an increased value for the minimum pressure coefficient, especially under off-design conditions. The sudden pressure drop around the leading-edge was weakened. The cavitation performance within the 0.5–1.2 Qd flow rate range, especially within the 0.62–0.78 Qd and 1.08–1.20 Qd ranges, was improved. The head and hydraulic efficiency was numerically checked without obvious change. This provided a good reference for optimizing the cavitation or other performances of bladed pumps.

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“…NACA0009 and its modified profiles are popular in the former studies of hydrodynamics and hydraulic machinery including the LE cavitation, tip-clearance cavitation, wake and hydraulic damping, excitation and response [23,24]. Also, numerous researches have been carried out on the LE cavitation of hydraulic machineries [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Designing Incidence-Angle-Targeted Anti-Cavitation Foil Profiles Using a Combination Optimization Strategy

et al. 2018

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In hydraulic machinery, the surface of the blade can get damaged by the cavitation of the leading-edge. In order to improve the cavitation performance, the anti-cavitation optimization design of blade leading-edge is conducted. A heuristic-parallel locally-terminated improved hill-climbing algorithm, which is named as the global dynamic-criterion (GDC) algorithm was proposed in this study. The leading-edge shape of NACA 0009-mod foil profile was optimized by combining the GDC algorithm, CFD prediction, Diffusion-angle Integral (DI) design method and orthogonal test. Three different optimal foil geometries were obtained for specific incidence angles that 0, 3, and 6 degrees. According to the flow field analyses, it was found that the geometric variation of the optimized foil fits the incoming flow better at the respective optimal incidence angles due to a slighter leading-edge flow separation. The pressure drops become gentler so that the cavitation performance get improved. Results show that the GDC algorithm quickly and successfully fits the target condition by parallel running with the ability against falling into local-best tarps. The −C pmin of the optimal foils was improved especially by +11.4% and +14.5% at 3 and 6 degrees comparing with the original foil. This study provided a reference for the anti-cavitation design of hydraulic machinery blades.

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Influence of Splitter Blades on the Cavitation Performance of a Double Suction Centrifugal Pump

Cited by 21 publications

References 13 publications

Design Optimization of Splitter Blades for Rocket Engine Turbopump

Design Optimization of Splitter Blades for Rocket Engine Turbopump

Anti-Cavitation Design of the Symmetric Leading-Edge Shape of Mixed-Flow Pump Impeller Blades

Designing Incidence-Angle-Targeted Anti-Cavitation Foil Profiles Using a Combination Optimization Strategy

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