Experimental Study on Operational Stability of Centrifugal Pumps of Varying Impeller Types Based on External Characteristic, Pressure Pulsation and Vibration Characteristic Tests

Jia, Xiaoqi; Chu, Qingyang; Zhang, Li; Zhu, Zuchao

doi:10.3389/fenrg.2022.866037

Cited by 4 publications

(6 citation statements)

References 21 publications

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“…To compare the pressure pulsations of the fire pump at different flow rates more intuitively, the pressure pulsation coefficient C p 17,18 was introduced to measure the magnitude of the pressure pulsations as followswhere P is the static pressure at a certain time, P¯ is the average static pressure, u is the circumferential speed of the impeller outlet, and ρ is the density of the water.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

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Experimental research on pressure pulsation and cavitation characteristics of centrifugal fire pump

Liu

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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To broaden the database of fire equipment selection and provide the basis for its selection and optimization, a low specific speed centrifugal fire pump with a specific speed of 24.7 was selected as the research object, and the inlet and outlet pressure pulsation and cavitation characteristics under different flow rates were analyzed through experiments. Results show that the head of the fire pump under the design flow rate was 75.68 m, and the efficiency was 36.84%. The dominant frequency of the pressure pulsation in the inlet and outlet of the pump under different flow rates is 1 APF (axial passing frequency). The zero flow rate has no obvious peak distribution at 1 BPF (blade passing frequency). The secondary frequency of 1 BPF and the n times the harmonic frequency of 1 BPF are distributed in the outlet of the pump. The critical net positive suction head of the fire pump under 1.0 Qd and 1.5 Qd was 0.95 m and 2.38 m, respectively.

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Section: Experimental Results and Analysismentioning

confidence: 99%

“…The pressure fluctuation information in a cycle under each flow rate was selected for analysis. To compare the pressure pulsations of the fire pump at different flow rates more intuitively, the pressure pulsation coefficient C p 17,18 was introduced to measure the magnitude of the pressure pulsations as follows…”

Section: Pressure Pulsation Analysismentioning

confidence: 99%

Experimental research on pressure pulsation and cavitation characteristics of centrifugal fire pump

Liu

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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“…Jia et al [5] studied the impeller influence on the pump stability, analyzing three types of impellers: closed impeller, semi-open impeller, and open impeller. For higher flow rates, the closed impeller exhibited the highest stability, while the open impeller performed the least reliably.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of vibration, the area around the tongue was the least stable, with the closed impeller causing the least casing vibration, and the open impeller resulting in the highest vibration levels. Additionally, the interaction between the volute and the impeller influenced flow stability and led to fluctuations in pressure distribution around the circumference of the volute [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Satellite Thermal Management Pump Impeller Design and Optimization

Drăgan,

Dumitrescu,

Dobromirescu

et al. 2024

Inventions

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This study presents a numerical approach to the design and optimization of centrifugal impellers used in the pumps of active thermal control systems of spacecraft. Although launch costs have shrunk in the last decade, the performance requirements, such as efficiency and reliability, have increased, as such systems are required to work up to 15 years, depending on the mission. To that effect, our paper deals with the first step in this pump design, namely the hydraulic optimization of the impeller. Constructively, this type of impeller allows for certain balancing systems and labyrinth seals to be applied in a more effective way, as well as allowing for additive manufacturing methods to be used—however, details regarding these aspects are beyond the scope of the current paper. By combining empirical formulas, computational fluid dynamics (CFD) analysis, and artificial neural networks (ANNs), the research focuses on achieving high efficiency and fast manufacturing. A series of geometries have been sized and validated using steady-state RANS (Reynolds Averaged Navier-Stokes) simulations, leading to the identification of the most efficient configuration. Subsequent optimization using an ANN resulted in a refined impeller design with notable improvements in hydraulic performance: a 3.55% increase in efficiency and a 7.9% increase in head. Key parameters influencing impeller performance, including blade number, incidence, and backsweep angles, are identified. This approach offers a comprehensive method to address the evolving requirements of space missions and contributes to the advancement of centrifugal pump technology in the space domain.

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“…Ji et al [10] used the Wray Agarwal (WA) turbulence model to simulate the internal and external characteristics of centrifugal pump, and the results showed that the WA model could effectively calculate the energy performance of centrifugal pump under various working conditions, and had high accuracy. Jia et al [11] through research showed that with the increase of flow, the stability of the external characteristics of centrifugal pump decreases, the stability of open impeller was the worst, while the stability of closed impeller under large flow was the best, and the shell vibration of closed impeller was the smallest. Based on the N-S equation, Zhang et al [12] proposed a design method of a high-speed centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Analysis of Centrifugal Pump Impeller Based on Fluid-Solid Coupling

Wang

et al. 2022

JMSE

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Purpose: Centrifugal pumps are prone to vibration problems during operation due to poor dynamic characteristics of its impellers that serve as the only running parts of such devices; the dynamic characteristics of the impeller during operation are the main reasons for the vibration of the centrifugal pump. Therefore, it is important to study the internal fluid flow and its influence on the dynamic characteristics of the pump impeller and to explore the causes of vibration during the transient start-up process. The understanding of such phenomena may lead to better design of such impellers. Methods: The geometry of the flow channel inside the centrifugal pump is established using Creo 4.0 software (American PTC company). The internal fluid flow computer simulation is carried out using Flomaster V9 software (UK Flowmaster company) to obtain the variation law of speed and flow during the start-up of the centrifugal pump, which is loaded into the simulation calculation of the centrifugal pump. The variation of speed and flow during the start-up process was further processed using the fluid-structure coupling method, and the structural vibration characteristics of the impeller under transient radial force are obtained by harmonic response analysis. Results: During the starting process of the centrifugal pump, the speed and flow first increased sharply and then decreased until reaching a stable process. During this period, the impeller vibration changed sharply; the overall vibration amplitude increased and fluctuated stably at the amplitude of 0.01 mm. In the unsteady numerical simulation of the centrifugal pump, the radial force on the impeller changes periodically. The time domain signal is transformed into a frequency domain signal, and the fundamental frequency of the impeller and the passing frequency of the blade are 101.67 Hz and 610 Hz, respectively. Conclusions: The radial force is the main cause of impeller vibration, and the transient radial force has the least dynamic impact on the impeller structure under the design condition and has a relatively large impact under the off-design condition. In order to ensure the stable operation of the centrifugal pump, it is necessary to avoid the centrifugal pump working under the non-standard flow condition, especially the small flow condition.

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Experimental Study on Operational Stability of Centrifugal Pumps of Varying Impeller Types Based on External Characteristic, Pressure Pulsation and Vibration Characteristic Tests

Cited by 4 publications

References 21 publications

Experimental research on pressure pulsation and cavitation characteristics of centrifugal fire pump

Experimental research on pressure pulsation and cavitation characteristics of centrifugal fire pump

Satellite Thermal Management Pump Impeller Design and Optimization

Dynamic Characteristic Analysis of Centrifugal Pump Impeller Based on Fluid-Solid Coupling

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