A novel pressure regulation system based on Banki hydro turbine for energy recovery under in-range and out-range discharge conditions

• Published in: Energy conversion and management Vol. 243; p. 1
• Main Authors: Hannachi, Marwa, Ketata, Ahmed, Sinagra, Marco, Aricò, Costanza, Tucciarelli, Tullio, Driss, Zied
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-09-2021; Elsevier Science Ltd
• Subjects: Banki turbine; Computational fluid dynamics; Computer applications; Control equipment; Efficiency; Energy distribution; Energy recovery; Finite element method; Flow characteristics; Flow rates; Flow velocity; Fluid flow; Hydraulic turbines; Hydrodynamics; Hydrodynamics energy recovery; Mathematical models; Mobile flap; Networks; Numerical analysis; Numerical methods; Piping systems; Pressure regulation system; Standard error; Turbines; Turbulence models; Water distribution; Water distribution network; Water engineering; Water pressure; Banki turbine; Hydrodynamics energy recovery; Pressure regulation system; Mobile flap; Water distribution network
• DOI: 10.1016/j.enconman.2021.114417
• EISSN: 1879-2227
• ISSN: 0196-8904

•Experimental characterization of a Banki turbine for pressure regulation.•Banki turbine was tested under both in-range and out-range flow condition modes.•Performance correlations were developed for fast assessment for various flap angles.•An efficiency gain of 76% was obtained with an embedded flap regulation device.•The system allowed an efficient recovery of wasted energy in water supply networks.
Efficiency improvement of water distribution networks needs to be in place to guarantee a long life period under suitable operating conditions. Excessive pressure is among the well-known issues encountered in water distribution networks which can cause strength damages to the piping system. In order to overcome this drawback and to reach a suitable water pressure delivery, the present work suggests a novel pressure regulation system. This regulation system is consisting of a Banki turbine equipped with a mobile flap as a control device. The suggested pressure regulation system was experimentally and numerically investigated under in-range i.e. like actual water distribution networks and out-range flow conditions. A set of computational fluid dynamic simulations was carried out to study the performance and flow characteristics around the turbine with and without a mobile flap. The flow solution was obtained by solving the Reynolds-averaged Navier–Stokes equations. Different rotor–stator interface and turbulence models, and mesh sizes were investigated to select the most accurate configuration of the numerical method. The validation of the numerical method was performed with an assessment of the standard error with respect to experimental data. Based on the experimental results, three correlations estimating the net head, the torque and the efficiency for given flap angle and volumetric flow rate were presented. Results revealed that the suggested regulation system presents a good efficiency up to 76% to recover the wasted hydrodynamics energy in water distribution networks.