Abstract
Diffuser augmented wind turbines (DAWTs) offer more energy efficient of production of wind power as compared to conventional wind turbines. In this paper, the mass flow rate of air through the diffuser is increased by addition of slits at the inlet section and designing of the diffuser is done using airfoils. The Reynolds averaged Navier–Stokes equations (RANS) are used along with k- SST turbulence model to calculate the power and thrust coefficients and to visualize the flow inside and outside the diffuser. These results are obtained by generation of geometry using CATIA and running the simulations in ANSYS Fluent. Grid convergence study is done for verification of these results prior to further analysis.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Ackermann T, Soder L (2002) An overview of wind energy-status. Renew Sustain Energy Rev 6(1–2):67–127
Ueno H, Serada T (2002) Wind turbine generation system and photovoltaic power generation system. NTT Power Build Facil J 39(231):42–45
Khamlaj TA, Rumpfkeil MP (2018) Analysis and optimization of ducted wind turbines. Energy Elsevier 162(C):1234–1252
Takahashi S, Hata Y, Ohya Y, Karasudani T, Uchida T (2012) Behavior of the blade tip vortices of a wind turbine equipped with a brimmed diffuser shroud. Energies 5(12):5229–5242
Lilley G, Rainbird W (1956) A preliminary report on the design and performance of ducted windmills. Tech. rep., College of Aeronautics Cranfield
Foreman K, Gilbert B, Oman R (1978) Diffuser augmentation of wind turbines. Sol Energy 20(4):305–311
Oman R, Foreman K, Gilbert B (1975) A progress report on the diffuser aurgmented wind turbine In: Proceedings 3rd Biennal conference and workshop on wind energy conversion systems, Washington, DC, USA, pp 819–826
Foreman K, Gilbert B, Oman R (1976) Di user augmentation of wind turbines. Tech. rep., Grumman Aerospace Corp., Bethpage, NY (USA). Research Dept
Igra O (1977) Compact shrouds for wind turbines. Energy Convers 16(4):149–157
Igra O (1981) Research and development for shrouded wind turbines. Energy Convers Manage 21(1):13–48
Abe K, Ohya Y (2004) An investigation of flow fields around flanged diffusers using cfd. J Wind Eng Indus Aerodyn 92(3):315–330
Abe K, Nishida M, Sakurai A, Ohya Y, Kihara H, Wada E, Sato K (2005) Experimental and numerical investigations of flow fields behind a small wind turbine with a flanged diffuser. J Wind Eng Indus Aerodyn 93(12):951–970
Ohya Y, Karasudani T, Sakurai A, Abe K-I, Inoue M (2008) Development of a shrouded wind turbine with a flanged diffuser. J Wind Eng Indus Aerodyn 96(5):524–539
Ohya Y, Karasudani T (2010) A shrouded wind turbine generating high output power with wind-lens technology. Energies 3(4):634–649
Acknowledgements
The authors would like to thank Department of Aeronautical and Automobile Engineering of Manipal Institute of Technology for their continuous support
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Surya, S., Radhakrishnan, J., Kumar, A. (2021). Effect of Slits in Diffuser Casing of Diffuser Augmented Wind Turbines(DAWTs). In: Prabu, T., Viswanathan, P., Agrawal, A., Banerjee, J. (eds) Fluid Mechanics and Fluid Power. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0698-4_25
Download citation
DOI: https://doi.org/10.1007/978-981-16-0698-4_25
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-16-0697-7
Online ISBN: 978-981-16-0698-4
eBook Packages: EngineeringEngineering (R0)