Influence of Diffuser Vane Number on Energy Loss of Multistage Centrifugal Pump

Wu, TianXin; Wu, Denghao; Zhang, Ting; Huang, H.-M.; Wu, YueZhong; Mou, Jiegang

doi:10.5293/ijfms.2021.14.4.373

Cited by 6 publications

(1 citation statement)

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“…The calculated entropy generation rate value was in good agreement with the actual hydraulic loss value in the pump. Wu et al [ 28 ] study the energy loss characteristics of a multi-stage pump with a different number of diffuser vanes by the entropy generation method. It was found that with the increase in the number of diffuser blades, the flow is more stable and the entropy generation decreases, but the intensity of pressure pulsation in the diffuser increases slightly.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Entropy Generation of the Multi-Stage Centrifugal Pump

Fan

Liang

Fan

et al. 2022

Entropy

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The energy loss of the multi-stage centrifugal pump was investigated by numerical analysis using the entropy generation method with the RNG k-ε turbulence model. Entropy generation due to time-averaged motion and velocity fluctuation was mainly considered. It was found that the entropy generation of guide vanes and impellers account for 71.2% and 23.3% of the total entropy generation under the designed flow condition. The guide vanes are the main hydraulic loss domains and their entropy generation is about 9 W/K, followed by impellers. There are vortices at the tongue of the guide vane inlet as well as flow separations in the impellers, which lead to entropy generation. The fluid impacts the outer surface of the guide vanes, resulting in the increase in entropy generation. There are refluxes near the guide vane tongues which also increase the entropy generation of this part. The entropy generation distribution of the guide vanes and impellers was investigated, which found that the positive guide vane has more entropy generation compared with the reverse guide. The entropy generation of the blade suction surface is higher compared with the pressure surface. This study indicated that the entropy generation method has distinct advantages in the assessment of hydraulic loss.

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Section: Introductionmentioning

confidence: 99%