1,721,355 research outputs found
A 1D/3D integrated CFD numerical approach for self-priming solid-handling centrifugal pump analysis
No full textThe analysis of two blades self-priming solid-handling centrifugal pumps is carried out
through a 1D/3D numerical approach. This class of pumps have to undergo to some particular
constraints, such as allowing the passage of solids with a prescribed minimum size and a high
level of mechanical resistance, in conjunction with as high as possible performances and
capability to self-prime. The study of this kind of machines, which at this time is based almost
entirely on empirical data derived from experience, can receive great advantages from the
three-dimensional numerical simulations. Recent developments in CFD calculations can
provide a means to follow this guideline. Some variants of the blade mean line have been
studied numerically through a two-step procedure: (i) a preliminary 1-D design and (ii) a
subsequent 3-D modelling using the CFX-TASCFlow code in order to optimise the pump
performances in terms of hydraulic efficiency and head
Parametric numerical analysis for the optimal fluid dynamic design of a two blade solid handling centrifugal pump
No full textSelf-priming solid-handling centrifugal pumps are used in many industrial and civil applications
for the transport of slurries and fluid with suspensions. This class of pumps has to undergo
restrictive geometrical and structural constraints (reduced number of blades, device for the selfpriming,
high mechanical resistance) which usually do not allow an optimal fluid dynamic design.
This is mainly due to the fact that the usual methods of investigation for these pumps are either not
reliable (one-dimensional and/or similarity analysis) or can require large time effort (experimental
campaign).
In this paper, a numerical integrated procedure developed for the study of two blades selfpriming
solid-handling centrifugal pumps and performed by means of the CFX-Tascflow numerical
code, has been carried out on a particular class of solid handling pumps. A number of variations of
the blade geometry is considered and studied numerically. In particular, the effect of the leading
edge profile and of different thickness distribution on the blade mean line is analysed, in terms of
total performance variations, flow field features and profile pressure distributions
Accordo di Programma concernente il Piano Triennale della Ricerca di Sistema e Piano Operativo Annuale per le attività di Ricerca e Sviluppo di Interesse Generale per il Sistema Elettrico Nazionale - Consiglio Nazionale delle Ricerche – Dipartimento Ingegneria, ICT e Tecnologie per l’Energia e i Trasporti
No full textAttività di ricerca nell’ambito del Progetto “Risparmio di energia elettrica attraverso l’uso efficiente di fonti energetiche diversificate e lo sviluppo di tecnologie innovativ
Numerical characterization through a CFD approach of a pressure-relief valve for automotive applications
No full textAnalisi numerica di sistemi in cambiamento di fase solido-liquido per l’accumulo di energia
No full text
Sustainable development and corporate global strategy: from vertical to horizontal efficiency of production systems
No full text
A numerical method for the efficient design of free opening hoods in industrial and domestic applications
No full textIn this paper, a numerical method for the design of free opening hoods in industrial and domestic applications is presented. The method is based on a CFD (Computational Fluid Dynamics) formulation for the capturing velocity assessment in capturing hoods which account for geometrical and viscous effects. Different hoods, which differ in shape (square and rectangular) and size, are created and their velocity field determined numerically. A comparison between the obtained numerical results and results obtained from empirical formula found in literature are presented and the discrepancy between them highlighted. Then, starting from the numerical results, a new equation, which takes into account viscous effects, is proposed, together with its range of applicability and its level of confidence. The suggested equation is simple in nature and it can be user friendly for the designer, in order to predict the air velocity in front of a capturing hood, and therefore to correctly and efficiently design the ventilation system
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