Communication Dans Un Congrès Année : 2016

Numerical Simulation of Instability Characteristic in Pump turbines

Résumé

In classical pumps, there is single positive slope part on the curve of pump performance, named head-drop phenomenon. However, a second head-drop phenomenon is found in our experiments in the pump mode of some medium pump turbines. The flow rate of this second head-drop phenomenon is 0.68-0.71 times of the design flow rate. As shown in our experimental results, it is significantly influenced by the complex vortices in the impeller inlet domain. Using SST k-ɷ turbulence model, numerical simulations are conducted to reveal its mechanism. After comparing numerical simulation results with the experimental results, it can be concluded that this second head-drop is closely related with the complex vortices in the impeller inlet. The complex vortices, due to the transmission flow between separated flow and back flow, is responsible for this second head-drop phenomenon.

Fichier principal
Vignette du fichier
Numerical Simulation of Instability Characteristic in Pump turbine-2016119.pdf (479.8 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence
Loading...

Dates et versions

hal-01518617 , version 1 (05-05-2017)

Licence

Identifiants

  • HAL Id : hal-01518617 , version 1

Citer

Hongjuan Ran, Xianwu Luo, Dezhong Wang. Numerical Simulation of Instability Characteristic in Pump turbines. 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC 2016), Apr 2016, Honolulu, United States. ⟨hal-01518617⟩

Collections

111 Consultations
111 Téléchargements

Partager

  • More