Effects of meridional flow passage shape on hydraulic performance of mixed-flow pump impellers

Hao, Bing; Cao, Shuai; Tan, Lei; Zhu, Baoshan

doi:10.3901/cjme.2013.03.469

Cited by 29 publications

(15 citation statements)

References 11 publications

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“…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].…”

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

“…Jim-Hyuk Kim & Kwang-Yong Kim [11] developed an optimization procedure for high efficiency design of mixed-flow pumps. Hao et al [1], Mehta and Patel [12] studied the effects of meridional flow passage shape on hydraulic performance of mixed-flow pump impellers. In 1981 K. Sham Sunder [13] presented a threedimensional method of stress analysis using finite element techniques for determining the stress distribution in centrifugal impellers.…”

Section: Nomenclaturementioning

confidence: 99%

“…The hydrodynamic design of a mixed flow pump impeller blade and its stress distribution play a significant role in the overall performance of a fluid system. The industrial design practice of mixed flow pump impeller design begins with the estimation of meridional streamlines by dividing the annulus by the equal area method as given by Hao et al [1] in 2013. Empirical coefficient depending on the specific speed employed to fix the blade angles at inlet and outlet.…”

Section: Introductionmentioning

confidence: 99%

Material Selection for Blades of Mixed Flow Pump Impeller Using ANSYS

Shukla

Roy

2015

Materials Today: Proceedings

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“…where ( ) can be got from (8) or (9). In [14,15], the distribution of the cross section area ( ) can be taken as a previous settled variable, so that the variable ( ) can still be taken as a known variable before the meridional channel design in this study.…”

Section: The Cross Section Area Equationmentioning

confidence: 99%

“…Though many inverse design methods about the blade shape have already been conducted by former studies [6][7][8], little attention has been paid to the meridional channel design. Nevertheless, the meridional shape is the foundation for the pump design, and Bing et al [9] had proven that the meridional shape has great effects on the pump performance, so that the related design method about the meridional channel should be treated seriously.…”

Section: Introductionmentioning

confidence: 99%

Derivation of the Mathematical Approach to the Radial Pump’s Meridional Channel Design Based on the Controlment of the Medial Axis

Wang

Xie

2017

Mathematical Problems in Engineering

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The meridional channel is the base for designing the radial pumps, and a new design approach is proposed here. Different from the previous studies, research here tries to establish the design model simply controlled with the radial coordinate. With the combination of a series of mathematical equations, the new design approach can shape the meridional contours directly by using the initial design variables. As for the mathematical constraint in the new design approach, it was presented in two forms, and each form had its corresponding solution. For the first form (Constraint I), the midpoints of the design points on the hub and shroud contours were thought to be located on the medial axis, and the PSO algorithm was adopted to search for the suitable results. Continually, to accelerate the design process, the second form (Constraint II) to simplify the mathematical constraint was added, and the explicit mathematical expressions calculating the coordinates on the hub and shroud contours were deduced. Finally, to check out the feasibility of the design approach in engineering, it was applied to redesign some typical meridional channels proposed by previous studies, and, through comparative analysis, the effectiveness of the new approach was evaluated and demonstrated.

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Effects of meridional flow passage shape on hydraulic performance of mixed-flow pump impellers

Cited by 29 publications

References 11 publications

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Flow Unsteadiness and Pressure Pulsations in a Nuclear Reactor Coolant Pump

Material Selection for Blades of Mixed Flow Pump Impeller Using ANSYS

Derivation of the Mathematical Approach to the Radial Pump’s Meridional Channel Design Based on the Controlment of the Medial Axis

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