Numerical study on air-core vortex: analysis of generation mechanism

Khoshkalam, Nima; Najafi, Atabak; Rahimian, Mohammad Hassan; Magagnato, Franco

doi:10.1007/s00419-019-01596-z

Cited by 10 publications

(2 citation statements)

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“…The sump test maintained the flow rate at 153.5 m 3 /h. In the pump sump test model, the flow distributor is introduced to facilitate the generation of vortices by artificially causing a flow biased to one side [10], which is fabricated to match the length and width of the short channel. Figure 2a shows the experimental set-up indicating the main components, whereas Figure 2b illustrates the flow distributor and Figure 2c illustrates the dimensions of the flow distributor.…”

Section: Model Test Methodsmentioning

confidence: 99%

“…As such, the prediction of pump sump performance using CFD techniques has been carried out effectively, but it is difficult to predict the free surface vortices and sub-surface vortices using CFD under the ASME HI 9.8 standard. For this reason, it is impossible to define the vortex types by analyzing the CFD results alone, but with the sump test, it is possible to approach these tasks conservatively [6,10].…”

Section: Introductionmentioning

confidence: 99%

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A Study Comparing the Subsurface Vortex Characteristics in Pump Sumps

Kim

Kim²,

Kim³

et al. 2022

Energies

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The vortex generated around the suction region of the pump sump causes problems such as damage to the pump, increased maintenance costs, and failure to supply coolant smoothly. Therefore, analyzing vortices is essential in pump sump design. However, the CFD analysis alone is insufficient in pump sumps vortex analysis since the reliability of the results is doubtful in scaled model tests. This study conducted the model test to validate a suitable CFD simulation method by identifying the Type 2 vortex among the three types of subsurface vortices. The dye test and PIV technology were used to visualize the Type 2 subsurface vortices, whereas the PIV vorticity results were then compared to the CFD results. The average vorticity of 60.2 (1/s) was identified as the reference level of Type 2 subsurface vortices formation by mapping the dye test results with the PIV vorticity results. Furthermore, the average vorticities of 84.63 (1/s) and 85.15 (1/s) were recorded in the presence of Type 2 subsurface vortices in PIV and CFD, respectively, and these values can be applied to the designing of pump sumps.

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Section: Model Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%