CFD analysis of unsteady cavitation phenomena in multistage pump with inducer

Sedlář, Milan; Zima, Patrik; Bajorek, M.; Krátký, Tomáš

doi:10.1088/1755-1315/15/6/062024

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…Watanabe et al optimized the pump inducer for better cavitation stability and less noise by using the CFD technique [8]. Sedlá ř et al and Hatano et al also applied CFD simulation to predict the cavitation performance of centrifugal pumps including noise characteristics [9,10]. Liu et al simulated the flow-induced noise in a centrifugal pump by using a large eddy simulation [11].…”

Section: Introductionmentioning

confidence: 99%

Reduction of flow-induce noise of a high-speed centrifugal pump by applying blade leaning on guide vane

Wei

Xiao

et al. 2022

J. Phys.: Conf. Ser.

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The generation of noise is harmful to worker’s health and the stable operation of the system. Due to the high speed and high head of the high-speed centrifugal pump, the noise performance needs improvement. Therefore, a high-speed centrifugal pump was studied both in experiment and numerical way. The noise performance of the high-speed pump is improved by optimizing the design of the impeller and the guide vane. The blade leaning is also applied as an improvement with forming the X-shape stagger between rotor and stator. Base on the numerical simulation, the characteristic curves and unsteady characteristics of different optimized cases are predicted. The optimal case is selected as the final experimental object to verify the effectiveness. Numerical result indicated that the pressure fluctuation at blade pass frequency (BPF) and the fluctuated radial force is the main component of the original pump. The noise spectrum distribution of the original pump is concentrated near the BPF in the experiment, which means that the rotation effect of the impeller is the main reason for the noise of the pump. By improving the hydraulic design, the pressure fluctuation and the radial force in the pump can be effectively suppressed. But many factors affect the pump noise, the improvement of hydraulic design is limited.

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Section: Introductionmentioning

confidence: 99%

Reduction of flow-induce noise of a high-speed centrifugal pump by applying blade leaning on guide vane

Wei

Xiao

et al. 2022

J. Phys.: Conf. Ser.

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“…There are still many researchers who use computational fluid dynamics (CFD) to study the cavitation instability (Sedlář et al, 2012; Shen et al, 2017; Watanabe et al, 2011). Li et al (2019) studied the net positive suction head at 3% head drop, as a function of flow rate conditions of a high specific speed pump and the results showed that the NPSH 3% peak is mainly affected by recirculation but not cavitation on blade.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic improvement by adding inlet baffles on centrifugal pump for reducing cavitation instabilities

Wei

Tao

Xiao

et al. 2021

Journal of Vibration and Control

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Cavitation instability is a common phenomenon that causes vibration and noise of turbomachinery. In this study, an attempt is made to suppress the cavitation instability. A high-speed centrifugal pump with inducer is taken as the research objective. Four baffles are evenly arranged at the inlet of the inducer as a hydrodynamic improvement. The energy characteristics of the pump are measured on a closed hydraulic test rig. The pressure, vibration, and noise under different flow rates and different cavitation number are acquired for comparative analyses. Experimental results show that the energy characteristics changed after hydrodynamic improvement. The original pump is mainly affected by y-direction vibration and is clearly suppressed in the new pump. The low-frequency pressure pulsation under partial flow rate condition can be effectively suppressed. The baffles can also reduce the broadband center frequency at the pump outlet and change the relationship between center frequency and cavitation number. These results show that the hydrodynamic improvement at the inlet helps the suppression of cavitation instability of the high-speed centrifugal pump.

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“…Although inducers were used in centrifugal pumps for decades, they are not commonly found in multistage centrifugal pumps. Sedlár et al [23] installed a three-bladed inducer in a two-stage centrifugal pump between the inlet guide vane and the first stage impeller. The pump with an inducer showed better cavitation reduction than the pump without an inducer.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

Shamsuddeen

Kim

et al. 2021

Processes

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A multistage centrifugal pump was developed for high head and high flow rate applications. A double-suction impeller and a twin-volute were installed at the first stage followed by an impeller, diffuser and return vanes for the next four stages. An initial design feasibility study was conducted using three-dimensional computational fluid dynamics tools to study the performance and the hydraulic losses associated with the design. Substantial losses in head and efficiency were observed at the interface between the first stage volute and the second stage impeller. An inducer-type guide vane (ITGV) was installed at this location to mitigate the losses by reducing the circumferential velocity of the fluid exiting the volute. The ITGV regulated the pre-swirl of the fluid entering the second stage impeller. The pump with and without ITGV is compared at the design flow rate. The pump with ITGV increased the stage head by 63.28% and stage efficiency by 47.17% at the second stage. As a result, the overall performance of the pump increased by 5.78% and 3.94% in head and efficiency, respectively, at the design point. The ITGV has a significant impact on decreasing losses at both design and off-design conditions. An in-depth flow dynamic analysis at the inducer-impeller interface is also presented.

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CFD analysis of unsteady cavitation phenomena in multistage pump with inducer

Cited by 5 publications

References 6 publications

Reduction of flow-induce noise of a high-speed centrifugal pump by applying blade leaning on guide vane

Reduction of flow-induce noise of a high-speed centrifugal pump by applying blade leaning on guide vane

Hydrodynamic improvement by adding inlet baffles on centrifugal pump for reducing cavitation instabilities

Effect of an Inducer-Type Guide Vane on Hydraulic Losses at the Inter-Stage Flow Passage of a Multistage Centrifugal Pump

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