Investigation of deflector geometry and turbine aspect ratio effect on 3D modified in-pipe hydro Savonius turbine: Parametric study

In this research, a 3D (three dimensional) modified in-pipe hydro Savonius turbine with a deflector is studied experimentally and numerically. The new Savonius turbine has two blades, consisting of a large number of semicircles with different diameters and its axis is perpendicular to the flow direction. The turbine and a deflector are constructed 3D printing, and then tested in a laboratory rig in several operating conditions. The same conditions as in the experiments are simulated numerically. The validity of numerical results is proved by comparison with experimental results. Hence, numerical simulation is developed to investigate the effects of deflector and turbine geometry. Moreover, a theoretical consideration to evaluate output power is provided. In this study, the deflector geometry is defined by two parameters: blockage coefficient, and angle, which with turbine aspect ratio are considered as three variable parameters. The effect of changing these three parameters on the flow rate, output torque, and turbine efficiency is determined and described graphically using 3D streamlines and pressure contours. The results indicate a positive effect of increasing turbine height. However, the increase in deflector parameters is positive only up to a certain amount and beyond it that has an adverse effect on turbine performance.

[1]  Riman Sipahutar,et al.  Performance of Combined Water Turbine Darrieus- Savonius with Two Stage Savonius Buckets and Single Deflector , 2015 .

[2]  Armando Carravetta,et al.  Hydropower Potential in Water Distribution Networks: Pressure Control by PATs , 2015, Water Resources Management.

[3]  M. Takao,et al.  Guide Vanes for Darreus Water Turbine in Tidal Current , 2013 .

[4]  Hongxing Yang,et al.  A novel vertical axis water turbine for power generation from water pipelines , 2013 .

[5]  Brian Kirke,et al.  Tests on ducted and bare helical and straight blade Darrieus hydrokinetic turbines , 2011 .

[6]  Nobuyuki Fujisawa,et al.  On the torque mechanism of Savonius rotors , 1992 .

[7]  François Avellan,et al.  Analysis of emerging technologies in the hydropower sector , 2019, Renewable and Sustainable Energy Reviews.

[8]  Ujjwal K. Saha,et al.  On the performance analysis of Savonius rotor with twisted blades , 2006 .

[9]  Steffi Dimke,et al.  Design and Stability of a Floating Free Stream Energy Converter , 2011 .

[10]  S. J. Kline,et al.  Describing Uncertainties in Single-Sample Experiments , 1953 .

[11]  A. Najafi,et al.  Experimental and numerical investigations on a new developed Savonius turbine for in-pipe hydro application , 2020, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy.

[12]  John E. Quaicoe,et al.  Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review , 2009 .

[13]  Keith Alexander,et al.  Radial- and mixed-flow turbines for low head microhydro systems , 2009 .

[14]  Keith Alexander,et al.  Microhydro : Cost-effective, modular systems for low heads , 2008 .

[15]  Helena M. Ramos,et al.  Low-Head Energy Conversion: A Conceptual Design and Laboratory Investigation of a Microtubular Hydro Propeller , 2012 .

[16]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[17]  Ujjwal K. Saha,et al.  Numerical Investigation to Assess an Optimal Blade Profile for the Drag Based Vertical Axis Wind Turbine , 2013 .

[18]  U. Saha,et al.  Parametric analysis of model Savonius hydrokinetic turbines through experimental and computational investigations , 2018 .

[19]  Zied Driss,et al.  Study of the bucket design effect on the turbulent flow around unconventional Savonius wind rotors , 2015 .

[20]  Si Huang,et al.  Numerical simulation of unsteady flow in a multistage centrifugal pump using sliding mesh technique , 2010 .

[21]  Keith Alexander,et al.  Optimum penstocks for low head microhydro schemes , 2008 .

[22]  Anton Schleiss,et al.  Experimental characterization of a five blade tubular propeller turbine for pipe inline installation , 2016 .

[23]  Roberto Revelli,et al.  Optimization of breastshot water wheels performance using different inflow configurations , 2016 .

[24]  Akinori Furukawa,et al.  Experimental study on simplification of Darrieus-type hydro turbine with inlet nozzle for extra-low head hydropower utilization , 2012 .

[25]  Domenico P. Coiro.  DEVELOPMENT OF INNOVATIVE TIDAL CURRENT ENERGY CONVERTERS: FROM RESEARCH TO DEPLOYMENT , 2012 .

[26]  Emanuele Quaranta,et al.  Stream water wheels as renewable energy supply in flowing water: Theoretical considerations, performance assessment and design recommendations , 2018, Energy for Sustainable Development.

[27]  Agnimitra Biswas,et al.  Experimental and computational evaluation of Savonius hydrokinetic turbine for low velocity condition with comparison to Savonius wind turbine at the same input power , 2014 .

[28]  Satoshi Watanabe,et al.  Simplified Structure of Ducted Darrieus-Type Hydro Turbine with Narrow Intake for Extra-low Head Hydropower Utilization , 2008 .

[29]  Keith Alexander,et al.  Axial-flow turbines for low head microhydro systems. , 2009 .

[30]  Patel C R,et al.  Investigation of Overlap Ratio for Savonius Type Vertical Axis Hydro Turbine , 2013 .

[31]  David Styles,et al.  Energy recovery in the water industry using micro-hydropower: an opportunity to improve sustainability , 2014 .

[32]  S. V. Prabhu,et al.  Influence of the deflector plate on the performance of modified Savonius water turbine , 2011 .

[33]  F. Menter.  ZONAL TWO EQUATION k-w TURBULENCE MODELS FOR AERODYNAMIC FLOWS , 1993 .

[34]  D. Wilcox.  Turbulence modeling for CFD , 1993 .

[35]  Mehrdad Raisee,et al.  Effects of Volute Curvature on Performance of a Low Specific-Speed Centrifugal Pump at Design and Off-Design Conditions , 2015 .

[36]  M. A. Kamoji,et al.  Experimental investigations on single stage modified Savonius rotor , 2009 .

[37]  Gábor Janiga,et al.  Optimal blade shape of a modified Savonius turbine using an obstacle shielding the returning blade , 2011 .

[38]  Dhiman Chatterjee,et al.  Influence of duct geometry on the performance of Darrieus hydroturbine , 2012 .

[39]  Adun Janyalertadun,et al.  A study of diffuser angle effect on ducted water current turbine performance using CFD , 2012 .

[40]  R. G. Simpson,et al.  Application of computational fluid dynamics to the design of pico propeller turbines , 2006 .

[41]  Riman Sipahutar,et al.  Experimental Study of Darrieus-Savonius Water Turbine with Deflector: Effect of Deflector on the Performance , 2014 .

[42]  Zied Driss,et al.  Numerical simulation and experimental validation of the turbulent flow around a small incurved Savonius wind rotor , 2014 .

[43]  Deepak Prasad,et al.  Design and Performance Testing of a Ducted Savonius Turbine for Marine Current Energy Extraction , 2013 .

[44]  Satoshi Watanabe,et al.  DEVELOPMENT OF DUCTED DARRIEUS TURBINE FOR LOW HEAD HYDROPOWER UTILIZATION , 2010 .

[45]  Mohammed Shaheen,et al.  Numerical study of two-bucket Savonius wind turbine cluster , 2015 .

[46]  T. I. Eldho,et al.  Performance Study of Modified Savonius Water Turbine with Two Deflector Plates , 2012 .

[47]  D. A. Howey,et al.  AXIAL FLUX PERMANENT MAGNET GENERATORS FOR PICO-HYDROPOWER , 2009 .

[48]  Armando Carravetta,et al.  Energy Production in Water Distribution Networks: A PAT Design Strategy , 2012, Water Resources Management.

[49]  A. A. Williams.  Pumps as turbines for low cost micro hydro power , 1996 .

[50]  Paul Coughlan,et al.  Optimization of Water Distribution Networks for Combined Hydropower Energy Recovery and Leakage Reduction , 2016 .

[51]  Jiri Obrovsky,et al.  Development of The New High Specific Speed Fixed Blade Turbine Runner , 2009 .

[52]  Nicola Fontana,et al.  Losses Reduction and Energy Production in Water-Distribution Networks , 2012 .

[53]  Roberto Revelli,et al.  CFD simulations to optimize the blade design of water wheels , 2017 .

[54]  Tao Ma,et al.  Development of inline hydroelectric generation system from municipal water pipelines , 2018 .