Analysis of Pressure Pulsation Induced by Rotor-Stator Interaction in Nuclear Reactor Coolant Pump

Zhang, Xu; Wang, Pengfei; Ruan, Xiangyan; Xu, Zhongbin; Fu, Xin

doi:10.1155/2017/7363627

Cited by 16 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A range analysis was carried out on the numerical calculation results in Table 10. Range analysis was carried out by Equations (12) and (13), where k i is the average value of j levels of factor i; s is range.…”

Section: The Intuitionistic Analysismentioning

confidence: 99%

“…Under the rotating stall condition, the blade passing frequency (i.e., three times the rotation frequency) decreased by 50% because of alternate stalled and unstalled passages; when the rotating stall occurred, the amplitude of the pressure fluctuation was much higher than that at unstalled points. Zhang et al [13] studied the pressure pulsation characteristics induced by the rotor-stator interaction in a nuclear reactor coolant pump. At the nominal flow, the flow rate distribution in the guide vanes was relatively uniform, and the amplitude of the pressure pulsation reached the minimum.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

Ren

Zhang

et al. 2020

Water

View full text Add to dashboard Cite

The aim of this study was to investigate the action mechanism of the rotor–stator interaction (RSI) on the transient flow field and hydrodynamic noise field inside the impeller of jet centrifugal pumps (JCPs) and optimize effects of the guide vane on the hydraulic and hydroacoustic characteristics of the impeller. The numerical method of CFD (computational fluid dynamics) coupled with CFA (computational fluid acoustics) was used to analyze the correlation between the guide vane and the flow/sound performances of the impeller. The orthogonal test method, with the hydroacoustic performance of the impeller taken as the objective, was used to optimize the structural parameters of the guide vane for the stability of the hydraulic performance of the JCP. The results show that the RSI leads to a significant increase in the hydroacoustic level of the impeller, but it is indispensable for improving the hydraulic performance of the pump. The RSI effect on the fluctuation intensity of the transient flow field inside the impeller is much more sensitive than the time-average, and the fluctuation intensity of the flow field is positively correlated with the vortex intensity inside the impeller. When the impeller geometry is constant, the evolution processes of the flow field inside the impeller are mainly related to the blade number of the guide vane; when the number of guide vanes is given, the RSI effect on the hydroacoustic characteristic of the impeller is characterized by a positive correlation between the total sound pressure level (SPL) and the fluctuation intensity of the flow field. The frequency spectrum characteristics of the hydroacoustic SPL of the impeller are not consistent with the pressure fluctuation characteristics inside the impeller. The pressure fluctuation characteristics are related not only to the blade number and speed of the impeller but also to its wake characteristics determined by the guide vane. The optimization scheme for the stable hydraulic performance of the JCP significantly reduced the total SPL of the impeller compared with the original scheme, which verifies the feasibility of using the weight matrix optimization method to obtain the global optimization scheme.

show abstract

Section: The Intuitionistic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

Ren

Zhang

et al. 2020

Water

View full text Add to dashboard Cite

show abstract

“…The preliminary flow simulation model of the RCP has been verified by grid independence verification [3] and performance test in our previous researches [19]. During normal operation, the temperature of the liquid in RCP is about 280 • C. Ignoring the influence of trace boric acid [20] and referring to the look-up table, it can be found that the physical property parameters of the liquid are a density of 750 kg/m 3 When the computation stopped, the steady-state static pressure on the impeller boundaries was recorded, which is shown in Figure 4. The static pressure on the outside of the hub is greater than that on the inside.…”

Section: Flow Simulation Of the Rcpmentioning

confidence: 99%

“…The reactor coolant pump (RCP) drives cooling water circulation in the nuclear power plant [1], which brings the heat of the nuclear reactor to the steam generator, thereby producing steam to generate electricity. The RCP impeller rotates at high speed in a high-temperature, high-pressure and strong-radiation environment [2,3]. To ensure the long-term operation of the nuclear power plant, hydraulic resonance should be avoided [4].…”

Section: Introductionmentioning

confidence: 99%

Research of Modal Analysis for Impeller of Reactor Coolant Pump

Wang

Zhang

et al. 2019

Applied Sciences

Self Cite

View full text Add to dashboard Cite

This paper studies the influence of added mass, centrifugal force and hydraulic load on natural frequencies of a Reactor Coolant Pump (RCP) impeller. A series of comparative studies under different conditions were carried out on a modal test bench and a simulation platform. Modal analysis of a full-scale RCP impeller was conducted by simulation, and an improved design of impeller was proposed to prevent hydraulic resonance. These results indicated that hydraulic load increases natural frequencies of the impeller. While the centrifugal force slightly reduces them, but it is negligible. Because the distribution of hydraulic load has an effect to natural frequencies, a solution of cutting inlet edges of blades can be used to increase the natural frequency that may cause hydraulic resonance. In summary, our research shows that both added mass and hydraulic load have a significant influence on natural frequencies of the RCP impeller, and redistributing the hydraulic load can alter natural frequencies of the impeller.

show abstract

“…Tsukamoto et al [28][29][30] researched the rotor-stator interaction in a diffuser pump with the vortex method and pressure fluctuation measurement, and unsteady hydrodynamic forces excited by the interaction between the impeller and the vaned diffuser with the same number of vanes as impeller were studied as well. Zhang et al [31] used CFD method to study pressure pulsation induced by rotor-stator interaction of a general mixed-flow pump.…”

Section: Introductionmentioning

confidence: 99%

Vibration of Shaft System in the Mixed‐Flow Pump Induced by the Rotor‐Stator Interaction under Partial Load Conditions

Wei

Shi

et al. 2018

Shock and Vibration

View full text Add to dashboard Cite

In order to reveal the relationship between rotor-stator interaction-induced unsteady flow and the shaft vibration of the mixed-flow pump, PIV (particle image velocimetry) and axis orbit experiments were carried out synchronously in a mixed-flow pump under designed flow rate (1.0Qdes) and the partial load conditions (0.4Qdes and 0.2Qdes). The distribution of the relative velocity and the vorticity in the rotor-stator interaction region at a certain position of the mixed-flow pump impeller was captured; the axis orbit diagram and the time-domain diagram of shaft system were acquired as well. Besides, the waterfall diagrams of the frequency spectrum under different flow rate conditions were compared. The results show that the backflow and the flow separation phenomenon appear in the rotor-stator interaction flow field under the partial load condition, indicating the flow instability. The medium-frequency exciting force and high-frequency exciting force induced by these unstable flows resulting from the rotor-stator interaction are the main factors to intensify the shaft vibration at the power frequency. The rotor-stator interaction under partial load condition is the main reason for the deterioration of shaft system vibration. The 2X frequency also affects the axis orbit in a low level, while other frequencies have less influence on the shaft vibration. The research results can provide the reference and theory instruction for revealing the operating characteristic of mixed-flow pump when it operates under partial load conditions and to reduce or to prevent the deterioration of vibration of shaft system.

show abstract

Analysis of Pressure Pulsation Induced by Rotor-Stator Interaction in Nuclear Reactor Coolant Pump

Cited by 16 publications

References 19 publications

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

Research of Modal Analysis for Impeller of Reactor Coolant Pump

Vibration of Shaft System in the Mixed‐Flow Pump Induced by the Rotor‐Stator Interaction under Partial Load Conditions

Contact Info

Product

Resources

About