Development of a ducted horizontal axis marine current turbine rotor

Development of a ducted horizontal axis marine current turbine rotor

Marine current energy resource has great potential to be exploited on a large scale because of its predictability and intensity. This energy can be extracted by various kinds of device, one of which is Horizontal Axis Marine Current Turbine (HAMCT). This thesis describes the development of a HAMCT t...

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Main Author: Abdul Aziz, Azliza
Format: Thesis
Language:English
Published: 2010
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/12289/4/AzlizaAbdulAzizMFKM2010.pdf
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id my-utm-ep.12289
record_format uketd_dc
institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Abdul Aziz, Azliza
Development of a ducted horizontal axis marine current turbine rotor
description Marine current energy resource has great potential to be exploited on a large scale because of its predictability and intensity. This energy can be extracted by various kinds of device, one of which is Horizontal Axis Marine Current Turbine (HAMCT). This thesis describes the development of a HAMCT to extract marine current energy suitable for Malaysian sea. The marine current speed in the Malaysian sea is quite low, averaging only about 1 m/s (2.0 knots). Presently available HAMCT designs are not suitable for low current speeds since a large turbine is needed while the blade diameter is limited to water depth. In this thesis, the problem is circumvented by placing the rotor in a duct, which helps to increase the water speed. The HAMCT rotor and duct were developed using Computer Aided Design (CAD) technique and analysed using Computational Fluids Dynamics (CFD) software. For the rotor, simulations were carried out with two conditions; ‘without duct’ and ‘with duct’. A 4.884 m diameter rotor with various numbers of blade and design tip speed ratio (TSR) were developed. The duct was developed in two different shapes, in which each shape has 5 variations of cylinder length. From the simulation of ducts, the current speed at the entrance of the cylinder is taken into account because the rotor is placed inside the cylinder. Thus, the maximum current speed generated was used in the ‘with duct’ simulation condition, while ‘without duct’ condition is when the rotor is simulated using actual current speed. The output power and performance of rotor are investigated using two methods; CFD simulation results and Blade Element Momentum (BEM) theory. It was found that the rotor model 4B2 is the greatest rotor because of its highest power coefficient for both methodst. The output power of the ducted turbine was significantly enhanced compared to the one without duct, which is 546.931W and 4250.012W by BEM. Validation was carried out by comparison to Batten work and it shows that the shapes of curves for both works are similar which this is sufficient to validate that the results of this project are genuine and acceptable.
format Thesis
qualification_level Master's degree
author Abdul Aziz, Azliza
author_facet Abdul Aziz, Azliza
author_sort Abdul Aziz, Azliza
title Development of a ducted horizontal axis marine current turbine rotor
title_short Development of a ducted horizontal axis marine current turbine rotor
title_full Development of a ducted horizontal axis marine current turbine rotor
title_fullStr Development of a ducted horizontal axis marine current turbine rotor
title_full_unstemmed Development of a ducted horizontal axis marine current turbine rotor
title_sort development of a ducted horizontal axis marine current turbine rotor
granting_institution Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department Faculty of Mechanical Engineering
publishDate 2010
url http://eprints.utm.my/id/eprint/12289/4/AzlizaAbdulAzizMFKM2010.pdf
_version_ 1747814915280732160
spelling my-utm-ep.122892017-09-20T07:50:09Z Development of a ducted horizontal axis marine current turbine rotor 2010-07 Abdul Aziz, Azliza TJ Mechanical engineering and machinery Marine current energy resource has great potential to be exploited on a large scale because of its predictability and intensity. This energy can be extracted by various kinds of device, one of which is Horizontal Axis Marine Current Turbine (HAMCT). This thesis describes the development of a HAMCT to extract marine current energy suitable for Malaysian sea. The marine current speed in the Malaysian sea is quite low, averaging only about 1 m/s (2.0 knots). Presently available HAMCT designs are not suitable for low current speeds since a large turbine is needed while the blade diameter is limited to water depth. In this thesis, the problem is circumvented by placing the rotor in a duct, which helps to increase the water speed. The HAMCT rotor and duct were developed using Computer Aided Design (CAD) technique and analysed using Computational Fluids Dynamics (CFD) software. For the rotor, simulations were carried out with two conditions; ‘without duct’ and ‘with duct’. A 4.884 m diameter rotor with various numbers of blade and design tip speed ratio (TSR) were developed. The duct was developed in two different shapes, in which each shape has 5 variations of cylinder length. From the simulation of ducts, the current speed at the entrance of the cylinder is taken into account because the rotor is placed inside the cylinder. Thus, the maximum current speed generated was used in the ‘with duct’ simulation condition, while ‘without duct’ condition is when the rotor is simulated using actual current speed. The output power and performance of rotor are investigated using two methods; CFD simulation results and Blade Element Momentum (BEM) theory. It was found that the rotor model 4B2 is the greatest rotor because of its highest power coefficient for both methodst. The output power of the ducted turbine was significantly enhanced compared to the one without duct, which is 546.931W and 4250.012W by BEM. Validation was carried out by comparison to Batten work and it shows that the shapes of curves for both works are similar which this is sufficient to validate that the results of this project are genuine and acceptable. 2010-07 Thesis http://eprints.utm.my/id/eprint/12289/ http://eprints.utm.my/id/eprint/12289/4/AzlizaAbdulAzizMFKM2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering 1. Islam M., Fartaj A. and Ting D. Current Utilization and Future Prospects of Emerging Renewable Energy Applications in Canada. 2003 2. Fraenkel, P.L. Marine Current Turbines: an emerging technology. Paper for Scottish Hydraulics Study Group Seminar in Glasgow on 19 March 2004. 2004 3. Akwensivie, F. In The Wake of a Marine Current Turbine. Master Thesis. University of Strathclyde, Glasgow; 2004 4. Tengku Ab Rashid, T.M.A. Preliminary Study of Ocean Energy Device. Bachelor Degree. Universiti Teknologi Malaysia; 2005. 5. Abdullah, F. Development of Horizontal Axis Marine Current Turbine. Bachelor Degree. Universiti Teknologi Malaysia; 2008. 6. Kirke, B. Developments in Ducted Water Current Turbines. University of South Australia, Australia. Published on www.cyberiad.net. 2005 7. Admiralty Manual of Navigation Vol 1. Ministry of Defence. Malaysia. 1987. 8. Marine Current Energy; http://www.worldenergy.org/wec-geis/publications/reports/ser/marine/marine.asp, 7/3/2007 9. Hydrographic Department. Malaysia Tides Table. Vol 1. Royal Malaysian Navy. Kuala Lumpur. 2005. 10. M. Rahuma, F.K. Development of Ocean Current Turbine for Power Generation. Master Thesis. Universiti Teknologi Malaysia; 2005. 11. MCT issues; http://www.marineturbines.com/background.htm, 7/3/2007 12. Zealand Energy Efficiency and Conservation authority, Marine Energy: Summary of Current Developments and Outlook for New Zealand. (2005). Power Projects Limited 13. The World Offshore Renewable Energy Report 2004 – 2008 14. Free Flow Turbine Project, Verdant Power. Available at www.verdantpower.com 2007. 15. The RITE Project, Verdant Power. Available at www.verdantpower.com. 2007 16. TidEl, Soil Machine Dynamics Ltd, England available at www.smdhydrovision.com 17. Lunar Energy: http://www.lunarenergy.co.uk, 1/9/2007. 18. Batten, W.M.J et al. The Prediction of the Hydrodynamic Performance of Marine Current Turbines. 2006. 19. Ingram, G. Wind Turbine Analysis using the Blade Element Momentum Method. Durham University. 2005. 20. Orme, J.A.C. I.Masters. Design and Testing of a Direct Drive Tidal Stream Generator. UK. 2004. 21. Ohya, Y. et al. Development of a Shrouded Wind Turbine with a Flanged Diffuser. 2008 22. Marine Current Resource and Technology Methodology; http://www.esru.strath.ac.uk, 27/6/2007. 23. Park, J. The Wind Power Book. Cheshire Books, California. 1981 24. Wind Turbine Design; http://en.wikipedia.org/wiki/Wind_turbine_design, 12/12/2007. 25. Jansen, W.A.M. Rotor Design for Horizontal Axis Windmills. SWD Publications. The Netherlands. 1977. 26. Tong, C.W. The Design and Testing of a Wind Turbine for Electrical Power Generation in Malaysian Wind Condition. PHD Thesis. Universiti Teknologi Malaysia; 2006. 27. Calvert, N.G. Windpower Principles: Their Application on the Small Scale. Charles Griffin & Company Limited. England. 1979. 28. NACA Airfoil Series; http://www.aerospaceweb.org, 29/1/2008. 29. Burton, T et al. Wind Energy Handbook. Wiley Publisher. England. 2001. 30. Wallis, R.A. Axial Flow Fans and Ducts. A Wiley-Interscience Publication. Canada. 1983. 31. Ghose, J.P, Gokarn, R.P. Basic Ship Propulsion. Allied Publishers Pvt. Limited. New Delhi. 2004.

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