Study on gas-liquid two-phase all-characteristics of CAP1400 nuclear main pump

Lu, Yonggang; Zhu, Rong; Wang, Xiuli; Fu, Qiang; Li, Mengyuan; Si, Xiangyu

doi:10.1016/j.nucengdes.2017.05.001

Cited by 30 publications

(4 citation statements)

References 4 publications

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“…Given the large size of the prototype pump and the high cost of the test using the prototype pump, models and test-stands with different scaling factors are commonly used (Cheng et al, 2016;Claus et al, 2005;Lu et al, 2017;Ni et al, 2017). Therefore, in this paper, a halfdimension scale model of an HPR1000 RCP was chosen, with the time cost required to build the computational domain and calculations reduced by approximately 30%.…”

Section: The Model Pumpmentioning

confidence: 99%

Dynamic flow behavior and performance of a reactor coolant pump with distorted inflow

Fan

Guo³

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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In the operation of a nuclear plant system, a distorted inflow of a reactor coolant pump appears owing to the steam generator channel head and multi-bend, leading to the deterioration of pump performance and stability. In the present study, three-dimensional numerical calculations of three model geometries are carried out using block grid technology, with RNG kand DDES model applied in the steady and transient simulation. The simulation results are validated with an experiment testing the pump with a short inlet pipe. As for the results, under the distorted inflow condition, the pump head and efficiency are reduced by 4% and 5.2% respectively at the nominal flow rate. Additionally, when the pump is coupled with upstream structures, the inlet flow becomes distorted and more chaotic, and the swirl and radial flow are produced by asymmetric pressure difference. Meanwhile, a pair of local vortices appears in the inlet section, forming re-distributed mass flow rates. As the distorted flow enters the pump, the blade inlet pressure and flow rate are unevenly distributed. Moreover, the evolution process of the vortex is accompanied with strong non-uniformity in the impeller channel, and thus asymmetric tangential force is imposed on the blades, increasing the risk of the fatigue breakdown of the impeller.

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Section: The Model Pumpmentioning

confidence: 99%

Dynamic flow behavior and performance of a reactor coolant pump with distorted inflow

Fan

Guo³

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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“…The distinguishing feature of this software is that it is a three-dimensional design software based on inverse design methods. Many researchers in inverse design optimization have used this software, indicating that it has comprehensive and convenient functionality in inverse design [15].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a Three-Dimensional CAD Graphics Support Platform for Pumps Based on Open CASCADE

Liu

Yuan

et al. 2023

Processes

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In the pump industry, designers commonly utilize mainstream three-dimensional computer-aided design (CAD) software (Unigraphics NX 12.0 and SolidWorks 2023). However, these CAD packages are generic and not optimized for the specific requirements of the pump industry. This leads to a lack of flexibility and increased complexity in their usage, as well as higher computational demands, resulting in elevated learning and operational costs. Additionally, there are concerns about potential information leaks and software restrictions. In this paper, we studied the organization architecture of commercial three-dimensional CAD software, and compared and analyzed the geometric kernels and rendering engines of mainstream three-dimensional software. Using the Open CASCADE geometric kernel and OpenSceneGraph rendering engine, together with the Visual Studio 2021 development environment and Qt interface library, we developed an autonomous copyright three-dimensional CAD graphics support platform for pumps. Based on the three-dimensional platform, we tested the commonly used graphics elements and basic algorithms required for pump modeling, and successfully designed and modeled the impeller and volute casing of a centrifugal pump. Through computational simulations and experimental verifications, we demonstrated that the accuracy and precision of the pump model designed on this platform meets the design requirements, indicating that this platform has practical pump design and modeling capabilities. Compared to commercial three-dimensional CAD software, this platform exhibits superior flexibility and interactivity in three-dimensional modeling that is specifically tailored for pump products. Consequently, it fully satisfies the needs for three-dimensional parameterized modeling and visualization of pumps.

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“…(2014) studied the pressure pulsation characteristics of the reactor coolant pump at low flow conditions, and found that the unstable pressure pulsation in the small flow condition was caused by the backflow in the impeller vane flow runner, and that the backflow mainly exists in the impeller and vane blade import and export. Lu et al. (2017, 2018, 2019) studied the third and fourth generation nuclear main pumps, including gas–liquid two-phase flow and structural optimizationand finding in different gas fraction conditions, the homogeneous distribution of gas phase component in the fluid area was mainly related to the operating condition of pump, and when the volume flow rate deviates from the designed operating point, the fluid medium s gas phase and liquid phase will separate to some extent.…”

Section: Introductionmentioning

confidence: 99%

Study on pressure pulsation characteristics of reactor coolant pump during the idling transition process

Wang

Zhu

et al. 2019

Journal of Vibration and Control

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The idling characteristic of the reactor coolant pump is one of the important indicators for the safe operation of the nuclear power system. The idling transition process of the reactor coolant pump under the power failure accident condition belongs to the transient flow process. During most of the time of the idling transition process, the parameters of flow, rotating speed, and head are all nonlinear changes, and the study of the idling change law is extremely difficult. This paper introduces the nonlinear inertia transient phase of the reactor coolant pump and the principle of wavelet analysis. Based on the experimental results of the idling transition process, the polynomial fitting of the flow curve and the rotating speed curve is fitted, and the idling transient equation is established which is a boundary condition for computational fluid dynamics simulation of the nonlinear idling transient stage of the reactor coolant pump with different types of guide vanes. The signal fluctuation of pressure pulsation time-domain change at the volute outlet in different sub-bands is analyzed by means of a fast, discrete wavelet transform, and the effects of different vane optimizations in different idling stages are analyzed. It was found that the pressure fluctuation amplitude of each sub-frequency range of pump outlet in the model of the shunt guide vane is significantly smaller than that of the normal guide vane.

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Study on gas-liquid two-phase all-characteristics of CAP1400 nuclear main pump

Cited by 30 publications

References 4 publications

Dynamic flow behavior and performance of a reactor coolant pump with distorted inflow

Dynamic flow behavior and performance of a reactor coolant pump with distorted inflow

Design and Implementation of a Three-Dimensional CAD Graphics Support Platform for Pumps Based on Open CASCADE

Study on pressure pulsation characteristics of reactor coolant pump during the idling transition process

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