Computational and Experimental Study of an Ultra Low Head Turbine

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Kathmandu University Computational and Experimental Study of an Ultra Low Head Turbine Group members: Nischal Pokharel(loyalnp18@gmail.

1 Kathmandu University Computational and Experimental Study of an Ultra Low Head Turbine Group members: Nischal Pradeep Parajuli Pratik Koirala Under the Supervision of: Prof. Dr.- Ing. Ramesh Kumar Maskey Associate Prof. Dr. Hari Pd. Neopane Mr. Sailesh Chitrakar

2 Presentation Outline Ultra Low Head(ULH) Turbine: Introduction Operation principle Status and current research Background Objectives Methodology 3D design of turbine with different profile Domain design Work flow Result analysis Test set up Future Works Conclusion References CRHT V, 2015 Kathmandu University 2

Discharge less than 1 m³/s Applicable in even natural or man-made rivers and

3 Ultra low head(ulh) turbine : Introduction?? Ultra low head turbine Head less than 5 m even less than 1 m head can work Discharge less than 1 m³/s Applicable in even natural or man-made rivers and canals. Static pressure difference principle. High torque low rpm(less than 15 rpm) CRHT V, 2015 Kathmandu University 3

4 Operation principle CRHT V, 2015 Kathmandu University 4

5 Status and current Research Research done in the country like Germany, Italy, UK etc. Research paper of University of Southampton. Focus on physical test rather than CFD analysis. Totally new concept for Nepal. Consultation : Dr. Gerald Müller Senior Lecturer, University of Southampton CRHT V, 2015 Kathmandu University 5

6 Background Third Model Second model First model CRHT V, 2015 Kathmandu University 6

7 Background(continued) Able to test third model Turbine operated on static pressure difference principle. Theoretical Efficiency of 40% was obtained. Importance of optimized canal system was realized. CRHT V, 2015 Kathmandu University 7

8 Objectives Fabrication of the turbine as per the design. Test setup building and testing to measure various parameters. Design of turbine model of different blade profiles, carry out simulation on them and choose the one that optimize the efficiency. CRHT V, 2015 Kathmandu University 8

9 Methodology Literature Review Familiarization with simulation software 3D Designs of turbine in Solid Works CFD analysis in ansys CFX and comparision of results Selection of best turbine according to efficiency Fabrication of turbine and building test set up Testing of the turbine and measuring various parameters CRHT V, 2015 Kathmandu University 9

Hub diameter = 9 cm Blade width / height = 8 cm Angle of

10 3D design of turbine with different profile Straight Profile Twisted Profile Curved Profile Specification of each turbine Hub diameter = 9 cm Blade width / height = 8 cm Angle of blades = 20 degree with hub axis CRHT V, 2015 Kathmandu University 10

Work flow Hexa dominant mesh with size 0.

005 respectively Turbulence model k-epsilon

467 m/s Fluid values Water = 1, Air at 25 o C

Opening condition in rotating domain Opening

11 Work flow Hexa dominant mesh with size and respectively Turbulence model k-epsilon Inlet condition Absolute velocity m/s Fluid values Water = 1, Air at 25 o C = 0 Outlet condition Static pressure 1 atm Opening condition in rotating domain Opening Pressure and Direction 1 atm Fluid values Water = 0, Air at 25 o C = 1 CRHT V, 2015 Kathmandu University 11

12 Result analysis Velocity Distribution for straight profile blade Velocity Distribution for twisted profile blade Velocity Distribution for curved profile blade Velocity Distribution with reduced splash by placing cover CRHT V, 2015 Kathmandu University 12

13 Result analysis Pressure Distribution Straight Profile Twisted Profile Curved Profile CRHT V, 2015 Kathmandu University 13

14 Result analysis Efficiency of various blades % % % Curved profile turbine proved to be best one in context of efficiency. CRHT V, 2015 Kathmandu University 14

15 Test set up Construction of canal in front of mechanical department block with closed loop system. CRHT V, 2015 Kathmandu University 15

16 Future Works Fabrication of curved profile turbine. Making test set up for the turbine in canal. Testing of the turbine and measuring various parameters. CRHT V, 2015 Kathmandu University 16

17 Conclusion Among the turbine differing in the blade profile the curved blade profile has been found most efficient. Theory of impact of jet also suggests curved profile as best efficient. The final model of turbine is yet left to be fabricated and tested. CRHT V, 2015 Kathmandu University 17

18 References Senior, J., Wiemann, P., & Muller, G. THE ROTARY HYDRAULIC PRESSURE MACHINE FOR VERY LOW HEAD HYDROPOWER SITES. University of Southampton, U.K. Harvey, A, & Brown, A (1992). Micro-Hydro Design Manual.Stockholm: ITDG Publishing. WIEMANN, P. (2006) Neue wirtschaftliche und technische Möglichkeiten der Stromerzeugung durch innovative Kleinwasserkraftwerke (New economic and technical possibilities for energy generation with innovative small hydropower converters, in German), Diplomarbeit, Universität Kalsruhe/ University of Southampton. Sayma, A. Computational Fluid Dynamics.Abdulnser sayma & Venus Publishing Aps.2009 Andersson, B.& Co., Computational Fluid Dynamics for Engineers, Cambridge University Press.2012 Ferziger, H.&Peric,M,. Computational Methods for Fluid Dynamics.3 rd, rev. edition 2002 CRHT V, 2015 Kathmandu University 18

19 Kathmandu University Thank you for your attention!

International Symposium on Current Research in HydraulicTurbines DESIGN AND CFD ANALYSIS OF PICO HYDRO TURGO TURBINE

Kathmandu University International Symposium on Current Research in HydraulicTurbines (CRHT-VII) DESIGN AND CFD ANALYSIS OF PICO HYDRO TURGO TURBINE Sudish Gyanwali 1*, Kush Kuikel 1 and Abinath Thapa