This paper presents a method for the investigation of a Pelton bucket efficiency based on the analysis of the particles flow tracks. The fluid particles trajectories on the rotating bucket were determined integrating the re-sults obtained by the unsteady numerical analyses carried out on the jet-bucket interaction. The computation was performed using a transient multi-phase homogeneous model and the jet was supposed to have constant diameter and axial-symmetric velocity profile. The numerical results were integrated by means of a predictor-corrector system, which combined two linear multi-step methods: a forth-order Adams-Bashford method as predictor and a fifth-order Adams-Multon method as corrector. The analysis of the fluid particle trajectories in the bucket together and of the single-particle momentum variation during the jet-bucket interaction allowed to examine the influence of the bucket geometry on the energy exchange of the turbine. The lagrangian approach of the proposed method also allowed to consider the losses associated with the leakage flow rate through the intake in the evaluation of the bucket efficiency.

Analysis of Pelton Bucket Efficiency

CAVAZZINI, GIOVANNA;PAVESI, GIORGIO;ARDIZZON, GUIDO
2011

Abstract

This paper presents a method for the investigation of a Pelton bucket efficiency based on the analysis of the particles flow tracks. The fluid particles trajectories on the rotating bucket were determined integrating the re-sults obtained by the unsteady numerical analyses carried out on the jet-bucket interaction. The computation was performed using a transient multi-phase homogeneous model and the jet was supposed to have constant diameter and axial-symmetric velocity profile. The numerical results were integrated by means of a predictor-corrector system, which combined two linear multi-step methods: a forth-order Adams-Bashford method as predictor and a fifth-order Adams-Multon method as corrector. The analysis of the fluid particle trajectories in the bucket together and of the single-particle momentum variation during the jet-bucket interaction allowed to examine the influence of the bucket geometry on the energy exchange of the turbine. The lagrangian approach of the proposed method also allowed to consider the losses associated with the leakage flow rate through the intake in the evaluation of the bucket efficiency.
2011
Proceedings of the 9th Conference on Turbomachinery, Fluid Dynamics and Thermodynamics
9789755613895
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2431017
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 0
social impact