Search results for " cross-flow"

ESPERIENZE FLUIDODINAMICHE SU UNA TURBINA DI PICCOLA POTENZA TIPO BANKI-MICHELL

2012

Cross-flow Turbine Design for Variable Operating Conditions

2014

Abstract The potential energy hidden in water resources is becoming more and more a significant economic value. The value of the hydroelectric energy is often magnified by the proximity of the turbine to pumps or other energy sinks owned by the same water manager. Cross-flow or Banki-Michel turbines are a very efficient and economic choice that allows a very good cost/benefit ratio for energy production located at the end of conduits carrying water from a water source to a tank. In the paper the optimum design of a cross-flow turbine is sought after, assuming a flow rate variable in time. Regulation of the discharge entering in the turbine is a key issue, which is faced adopting a shaped se…

Numerical analysis of a new cross-flow type hydraulic turbine for high head and low flow rate

2021

Cross-flow turbines have recently been proposed for energy recovery in aqueducts when the outlet pressure is greater than zero, owing to their constructive simplicity and good efficiency within a large range of flow rates and head drops. In the case of high head drop (higher than 150 m) and relatively small discharge (lower than 0.2 m3/s), the traditional design of these turbines leads to very small widths of the nozzle and the runner; as a consequence, friction losses grow dramatically and efficiency drops down to very low values. Standard Pelton turbines require zero outlet pressure and cannot be used as alternatives. A new counter-pressure hydraulic turbine for high head and low flow rat…

Banki-Michell Optimal Design by Computational Fluid Dynamics Testing and Hydrodynamic Analysis

2013

In hydropower, the exploitation of small power sources requires the use of small turbines that combine efficiency and economy. Banki-Michell turbines represent a possible choice for their simplicity and for their good efficiency under variable load conditions. Several experimental and numerical tests have already been designed for examining the best geometry and optimal design of cross-flow type machines, but a theoretical framework for a sequential design of the turbine parameters, taking full advantage of recently expanded computational capabilities, is still missing. To this aim, after a review of the available criteria for Banki-Michell parameter design, a novel two-step procedure is de…

REGOLAZIONE DELLE PRESSIONI MEDIANTE PRODUZIONE DI ENERGIA IDROELETTRICA NELLE RETI DI DISTRIBUZIONE IDRICA

2016

Negli ultimi anni, sempre più gestori di reti idriche hanno mostrato interesse nella realizzazione di micro e mini centrali idroelettriche poiché: È spesso disponibile un eccesso di pressione che viene oggi, frequentemente, dissipato mediante valvole PRV; La produzione di energia elettrica “propria” contribuirebbe a ridurre i costi energetici per la gestione della rete stessa

Low-Head Hydropower for Energy Recovery in Wastewater Systems

2022

Hydraulic turbines for energy recovery in wastewater treatment plants, with relatively large discharges values and small head jumps, are usually screw Archimedes or Kaplan types. In the specific case of a small head jump (about 3 m) underlying a rectangular weir in the major Palermo (Italy) water treatment plant, a traditional Kaplan solution is compared with two other new proposals: a Hydrostatic Pressure Machine (HPM) located at the upstream channel and a cross-flow turbine (CFT) located in a specific underground room downstream of the same channel. The fluid mechanical formulations of the flow through these turbines are analyzed and the characteristic parameters are stated. Numerical ana…