Multi-parameter optimization design, numerical simulation and performance test of mixed-flow pump impeller

Hao, Bing; Cao, Shuai

doi:10.1007/s11431-013-5308-0

Cited by 20 publications

(9 citation statements)

References 20 publications

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“…An investigation on the internal flow in the mixed-flow nuclear reactor coolant pump is one of the key problems for the development of reactor coolant pumps in large pressurized water reactors. Some investigations have been conducted to study the design of the mixed-flow pump [4] and [5] and flows instabilities [6] and [7]. However, most of them only focus on the unsteady pressure pulsation in impeller [8] and [9] or the performance of the nuclear reactor coolant pump [10] and [11].…”

Section: Introductionmentioning

confidence: 99%

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Ni¹,

Yang²,

Gao³

et al. 2016

SV-JME

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A nuclear reactor coolant pump (RCP) [1], the device in the reactor core and the steam generator that transfers the heat energy [2], is the "heart" of a nuclear reactor driving the circulation flow of the coolant in the main loop [3]. The nuclear reactor coolant pump is the only rotating part of the nuclear island, so it belongs in a nuclear safety grade one facility. Moreover, it is also the main energy-consuming equipment in the nuclear power plants, which must be guaranteed to operate continuously over a long term and without trouble. An investigation on the internal flow in the mixed-flow nuclear reactor coolant pump is one of the key problems for the development of reactor coolant pumps in large pressurized water reactors. Some investigations have been conducted to study the design of the mixed-flow pump [4] and [5] and flows instabilities [6] and [7]. However, most of them only focus on the unsteady pressure pulsation in impeller [8] and [9] or the performance of the nuclear reactor coolant pump [10] and [11]. The unsteady flow structure of a mixed-flow nuclear reactor coolant pump, especially in certain specific regions, is very important to the safety analysis of a nuclear reactor, as it could generate serious flow-induced vibration, threatening the pump integrity [8]. Therefore, a comprehensive analysis and prediction of pressure pulsation caused by intense rotor-stator interaction are essential for the design of the mixed-flow nuclear reactor coolant pump [12] and [13]. At present, in order to improve the efficiency and stable operation of the nuclear reactor coolant pump, the complicated internal unsteady flow structures should be thoroughly illustrated.The nuclear reactor coolant pump has a special structure equipped with a spherical casing, which determines a typical and complex flow pattern within the pump. Knierim et al.[14] designed a new type of reactor coolant pump for a 1400 MW nuclear power plant. The impeller and diffuser were gradually optimized based on the computational fluid dynamics (CFD). The volute casing is a spherical shape with a discharge nozzle facing the impeller, and the flow structures in the region around the discharge nozzle are uniform. The region of the discharge nozzle itself is characterized by the fact that the flow below the outlet port is divided into two parts. One portion flows out of the casing discharge nozzle, whereas the other portion circulates around the casing once more prior to exiting. Kato et al.[15] and [16] described internal flows of a high-specific-speed mixed-flow pump at low flow rates using large-eddy simulation (LES), and it showed that the head-flow curve exhibited weak • Flow separations and backflows easily occur at the diffuser channels near the discharge nozzle region.• At the left region of the casing, the discharge nozzle is affected significantly by an intense rotor-stator interaction effect.• In the right and middle of the casing nozzle, unsteady flow structures are more complicated.• An unsteady vortex-shedding effect would motivate evid...

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Section: Introductionmentioning

confidence: 99%

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Ni¹,

Yang²,

Gao³

et al. 2016

SV-JME

View full text Add to dashboard Cite

show abstract

“…The key component of mixed-flow pump for energy conversion is the impeller, so plenty of efforts have been conducted to improve its performance. Those effects can be categorized into four main strategies as follows: design methodology of impeller [1][2][3][4][5] ; optimization of impeller [6][7][8][9][10] ; geometry of impeller [11][12][13][14] ; and prewhirl regulation at impeller inlet. [15][16][17] Zangeneh 1 and Bonaiuti et al 18 proposed a design method for the radial and mixed-flow impeller, and this design method had also been applied in pumped storage hydro units to design a highefficiency runner.…”

Section: Introductionmentioning

confidence: 99%

Influence of T-shape tip clearance on performance of a mixed-flow pump

Tan

Xie

Liu

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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Influence of original and T-shape blade end on performance of a mixed-flow pump is investigated by using experimental measurement and numerical simulation. The new proposed T-shape blade end is formed at 95%-100% blade height with a linear increase of blade thickness. In comparison with original blade end, the efficiency of pump with T-shape blade end increases by 1.86%, and the leakage flow decreases by 15.95%. Space streamlines across the blade tip clearance can be divided into three beams with different movement trajectories, and the swirl motions of streamlines directly correspond to the swirling strength. The highest amplitude of pressure fluctuation appears at the blade leading edge along the tip clearance. In comparison with original blade end, the highest amplitude of pressure fluctuation for T-shape blade end decreases by 27.45%. The dominant frequencies of the pressure fluctuations in tip clearance region for original blade end and T-shape blade end are both five times of the axis rotation frequency, corresponding to the impeller blade number of five.

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“…The optimization design has also been developed from single-objective, single-parameter design to the multi-objective, multiparameter with intelligent algorithm. [3][4][5] Zhu et al 6 propose a multiobjective optimization design system, including the 3D inverse design, computational fluid dynamics, design of experiment, response surface methodology, and multiobjective genetic algorithm to design a middle-high-head pump-turbine runner. The geometrical parameters are also important for the pump performance.…”

Section: Introductionmentioning

confidence: 99%

Pressure fluctuation and flow pattern of a mixed-flow pump under design and off-design conditions

Tan

Liu

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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The pressure fluctuations and flow pattern in a mixed-flow pump are numerically investigated under design and off-design conditions. The accuracy and reliability are validated by good agreement of numerical results and experimental data of pump energy performance. At design flow rate, the dominant frequencies of pressure fluctuations are impeller rotation frequency or integer multiples of it, which are mainly induced by the rotor–stator interaction. At overload condition, the dominant frequencies of pressure fluctuations are similar as those of design flow rate, but the maximum amplitudes increase to about 2.5 times of those of design flow rate. At partial load condition, the pressure fluctuations and flow pattern are complicated. The low dominant frequencies below the impeller rotation frequency are related to the process of vortex emergency, movement and disappearance.

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Multi-parameter optimization design, numerical simulation and performance test of mixed-flow pump impeller

Cited by 20 publications

References 20 publications

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Influence of T-shape tip clearance on performance of a mixed-flow pump

Pressure fluctuation and flow pattern of a mixed-flow pump under design and off-design conditions

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