[article]
| Titre : |
The effect of impeller cutback on the fluid-dynamic pulsations and load at the blade-passing frequency in a centrifugal pump |
| Type de document : |
texte imprimé |
| Auteurs : |
Raúl Barrio, Auteur ; Blanco, Eduardo, Auteur ; Jorge Parrondo, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
11 p. |
| Note générale : |
Fluids engineering |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Pressure flow (Dynamics) impellers blades force pumps fluctuations (Physics) centrifugal pumps |
| Résumé : |
A study is presented on the fluid-dynamic pulsations and the corresponding dynamic forces generated in a centrifugal pump with single suction and vaneless volute due to blade-volute interaction. Four impellers with different outlet diameters, obtained from progressive cutbacks (trimmings) of the greatest one, were successively considered in the test pump, so that the radial gap between the impeller and the volute ranged from 8.8% to 23.2% of the impeller radius. The study was based on the numerical computation of the unsteady flow through the machine for a number of flow rates by means of the FLUENT code, solving the 3D unsteady Reynolds-averaged Navier–Stokes equations. Additionally, an experimental series of tests was conducted for the pump with one of the impellers, in order to obtain pressure fluctuation data along the volute front wall that allowed contrasting the numerical predictions. The data collected from the numerical computations were used to estimate the dynamic radial forces and torque at the blade-passing frequency, as a function of flow rate and blade-tongue radial gap. As expected, for a given impeller diameter, the dynamic load increases for off-design conditions, especially for the low range of flow rates, whereas the progressive reduction of the impeller-tongue gap brings about corresponding increments in dynamic load. In particular, varying the blade-tongue gap within the limits of this study resulted in multiplying the maximum magnitude of the blade-passing frequency radial force by a factor of about 4 for low flow rates (i.e., below the nominal flow rate) and 3 for high flow rates. |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 11 (Novembre 2008) . - 11 p.
[article] The effect of impeller cutback on the fluid-dynamic pulsations and load at the blade-passing frequency in a centrifugal pump [texte imprimé] / Raúl Barrio, Auteur ; Blanco, Eduardo, Auteur ; Jorge Parrondo, Auteur . - 2009 . - 11 p. Fluids engineering Langues : Anglais ( eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 11 (Novembre 2008) . - 11 p.
| Mots-clés : |
Pressure flow (Dynamics) impellers blades force pumps fluctuations (Physics) centrifugal pumps |
| Résumé : |
A study is presented on the fluid-dynamic pulsations and the corresponding dynamic forces generated in a centrifugal pump with single suction and vaneless volute due to blade-volute interaction. Four impellers with different outlet diameters, obtained from progressive cutbacks (trimmings) of the greatest one, were successively considered in the test pump, so that the radial gap between the impeller and the volute ranged from 8.8% to 23.2% of the impeller radius. The study was based on the numerical computation of the unsteady flow through the machine for a number of flow rates by means of the FLUENT code, solving the 3D unsteady Reynolds-averaged Navier–Stokes equations. Additionally, an experimental series of tests was conducted for the pump with one of the impellers, in order to obtain pressure fluctuation data along the volute front wall that allowed contrasting the numerical predictions. The data collected from the numerical computations were used to estimate the dynamic radial forces and torque at the blade-passing frequency, as a function of flow rate and blade-tongue radial gap. As expected, for a given impeller diameter, the dynamic load increases for off-design conditions, especially for the low range of flow rates, whereas the progressive reduction of the impeller-tongue gap brings about corresponding increments in dynamic load. In particular, varying the blade-tongue gap within the limits of this study resulted in multiplying the maximum magnitude of the blade-passing frequency radial force by a factor of about 4 for low flow rates (i.e., below the nominal flow rate) and 3 for high flow rates. |
| En ligne : |
http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] |
|
Ajouter le résultat dans votre panier Faire une suggestion Affiner la rechercheStudy of air and water supply to old ironwork of Teixois-Taramundi (Asturias), Spain / Fernàndez, Joaquin in Journal of hydraulic research, Vol. 44 N°1 (2006)
