Advancements in Wind Energy: Exploring the Potential of Diffuser Augmented Wind Turbines (DAWTs)

International Journal of Mechanical Engineering

© 2025 by SSRG - IJME Journal

Volume 12 Issue 1

Year of Publication : 2025

Authors : Shilpa Gujar, Abhijeet Auti, Sandip Kale

10.14445/23488360/IJME-V12I1P102

How to Cite?

Shilpa Gujar, Abhijeet Auti, Sandip Kale, "Advancements in Wind Energy: Exploring the Potential of Diffuser Augmented Wind Turbines (DAWTs)," SSRG International Journal of Mechanical Engineering, vol. 12,  no. 1, pp. 12-23, 2025. Crossref, https://doi.org/10.14445/23488360/IJME-V12I1P102

Abstract:

This paper explores recent advancements in wind turbine technology, focusing on Diffuser Augmented Wind Turbines (DAWTs). It provides a thorough review of the various research studies related to wind turbines equipped with diffusers, highlighting both numerical simulations and experimental data. The review categorizes the literature into two main areas: studies on the performance and operation of wind turbines with diffuser augmentation and comparative analyses of different types of DAWTs. The key parameters of diffuser design, such as length, open-angle, and the effect of flanged versus un-flanged configurations, are examined to determine their impact on power output and efficiency. The findings reveal that DAWTs significantly enhance wind turbine performance by increasing wind velocity through the rotor plane, surpassing the traditional Betz limit. This advancement results in higher power outputs, reduced noise, and improved tolerance to yaw angle variations. Despite these advantages, the commercialization of DAWTs faces challenges, including high initial costs, maintenance issues, and the complexity of integrating aerodynamic, material, and control system innovations. The paper concludes that while DAWTs offer promising improvements in wind energy efficiency, overcoming these challenges through innovative design and manufacturing approaches is crucial for their broader adoption in sustainable energy generation.

Keywords:

Diffuser augmented wind turbines, Wind energy efficiency, Aerodynamic optimization, Power output enhancement, Small-scale wind.

References:

[1] Jijian Lian et al., “A Review on Recent Sizing Methodologies of Hybrid Renewable Energy Systems,” Energy Conversion and Management, vol. 199, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[2] José Luis Torres-Madroñero et al., “Formulation and Simulation of a Hybrid Solar PV-Wind Generation System with Photovoltaic Concentration for Non-Interconnected Areas to the Energy Grid,” 2020 5th International Conference on Sustainable and Renewable Energy Engineering (ICSREE 2020), vol. 181, pp. 1-7, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[3] José Luis Torres-Madroñero, César Nieto-Londoño, and Julián Sierra-Pérez, “Hybrid Energy Systems Sizing for the Colombian Context: A Genetic Algorithm and Particle Swarm Optimization Approach,” Energies, vol. 13, no. 21, pp. 1-30, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[4] Faustino Moreno-Gamboa, Ana Escudero-Atehortua, and César Nieto-Londoño, “Performance Evaluation of External Fired Hybrid Solar Gas-Turbine Power Plant in Colombia Using Energy and Exergy Methods,” Thermal Science and Engineering Progress, vol. 20, pp. 1-25, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[5] J. Lerche et al., “The Impact of COVID-19 on Offshore Wind Project Productivity – A Case Study,” Renewable and Sustainable Energy Reviews, vol. 158, pp. 1-12, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[6] K.S.R. Murthy, and O.P. Rahi, “A Comprehensive Review of Wind Resource Assessment,” Renewable and Sustainable Energy Reviews, vol. 72, pp. 1320-1342, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[7] Paul Elsner, and Suzette Suarez, “Renewable Energy from the High Seas: Geo-Spatial Modelling of Resource Potential and Legal Implications for Developing Offshore Wind Projects Beyond the National Jurisdiction of Coastal States,” Energy Policy, vol. 128, pp. 919-929, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[8] Md Liton Hossain, Ahmed Abu-Siada, and S.M. Muyeen, “Methods for Advanced Wind Turbine Condition Monitoring and Early Diagnosis: A Literature Review,” Energies, vol. 11, no. 5, pp. 1-14, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[9] M. Natesan, S. Jeyanthi, and U. Sivasathya, “A Review on Design of Augmented Wind Turbine Blade for Low Wind Speed Urban Area,” International Journal of Mechanical Engineering and Technology, vol. 8, no. 7, pp. 685-691, 2017.
[Google Scholar] [Publisher Link]
[10] Uli Göltenbott et al., “Aerodynamic Interaction of Diffuser Augmented Wind Turbines in Multi-Rotor Systems,” Renewable Energy, vol. 112, pp. 25-34, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[11] R. Bontempo, and M. Manna, “On the Potential of the Ideal Diffuser Augmented Wind Turbine: An Investigation using a Momentum Theory Approach and a Free-Wake Ring-Vortex Actuator Disk Model,” Energy Conversion and Management, vol. 213, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[12] Arslan Saleem, and Man-Hoe Kim, “Effect of Rotor Tip Clearance on the Aerodynamic Performance of an Aerofoil-Based Ducted Wind Turbine,” Energy Conversion and Management, vol. 201, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[13] Francesco Avallone, Daniele Ragni, and Damiano Casalino, “On the Effect of the Tip-Clearance Ratio on the Aeroacoustics of a Diffuser-Augmented Wind Turbine,” Renewable Energy, vol. 152, pp. 1317-1327, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[14] Arslan Saleem, and Man-Hoe Kim, “Performance of Buoyant Shell Horizontal Axis Wind Turbine under Fluctuating Yaw Angles,” Energy, vol. 169, pp. 79-91, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[15] Vinit V. Dighe, Francesco Avallone, and Gerard van Bussel, “Effects of Yawed Inflow on the Aerodynamic and Aeroacoustic Performance of Ducted Wind Turbines,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 201, pp. 1-12, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[16] Arslan Saleem, and Man-Hoe Kim, “Aerodynamic Analysis of an Airborne Wind Turbine with Three Different Aerofoil-Based Buoyant Shells Using Steady RANS Simulations,” Energy Conversion and Management, vol. 177, pp. 233-248, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[17] Aierken Dilimulati, Ted Stathopoulos, and Marius Paraschivoiu, “Wind Turbine Designs for Urban Applications: A Case Study of Shrouded Diffuser Casing for Turbines,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 175, pp. 179-192, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[18] Mohanned Mohammad Naji, and Balasem Abdulameer Jabbar, “Diffuser Augmented Wind Turbine: A Review Study,” AIP Conference Proceedings, 3rd International Conference on Engineering and Science, Al-Samawa, Iraq, vol. 3051, no. 1, 2024.
[CrossRef] [Google Scholar] [Publisher Link]
[19] Akin Ilhan, Besir Sahin, and Mehmat Bilgili, “A Review: Diffuser Augmented Wind Turbine Technologies,” International Journal of Green Energy, vol. 19, no. 1, pp. 1-27, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[20] K.M. Foreman, B. Gilbert, and R.A. Oman, “Diffuser Augmentation of Wind Turbines,” Solar Energy, vol. 20, no. 4, pp. 305-311, 1978.
[CrossRef] [Google Scholar] [Publisher Link]
[21] D.G. Phillips, R.G.J. Flay, and T.A. Nash “Aerodynamic Analysis and Monitoring of the Vortec 7 Diffuser-Augmented Wind Turbine,” Transactions of the Institution of Professional Engineers New Zealand: Electrical/Mechanical/Chemical Engineering Section, vol. 26, no. 1, pp. 13-19, 1999.
[Google Scholar] [Publisher Link]
[22] Yuji Ohya et al., “Wind Lens Technology and its Application to Wind and Water Turbine and Beyond,” Renewable Energy and Environmental Sustainability, vol. 2, pp. 1-6, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[23] Koichi Watanabe, and Yuji Ohya, “Water Turbines with a Brimmed Diffuser by Using Wind Lens Technology,” International Journal of Energy for a Clean Environment, vol. 22, no. 4, pp. 33-45, 2021.
[CrossRef] [Google Scholar] [Publisher Link]
[24] Yuji Ohya, and Takashi Karasudani, “A Shrouded Wind Turbine Generating High Output Power with Wind-Lens Technology,” Energies, vol. 3, no. 4, pp. 634-649, 2010.
[CrossRef] [Google Scholar] [Publisher Link]
[25] Walter Presz, and Michael Werle, “Wind Turbine with Mixers and Ejectors,” U.S. Patent 20090087308A2, pp. 1-21, 2011.
[Publisher Link]
[26] C.B. Okhio, H.P. Horton, and G. Langer, “Effects of Swirl on Flow Separation and Performance of Wide Angle Diffusers,” International Journal of Heat and Fluid Flow, vol. 4, no. 4, pp. 199-206, 1983.
[CrossRef] [Google Scholar] [Publisher Link]
[27] A. Mariotti, G. Buresti, and M.V. Salvetti, “Use of Multiple Local Recirculations to Increase the Efficiency in Diffusers,” European Journal of Mechanics - B/Fluids, vol. 50, pp. 27-37, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[28] Mohammad Ali Rahmatian, Amin Nazarian Shahrbabaki, and Seyed Peyman Moeini, “Single-Objective Optimization Design of Convergent-Divergent Ducts of Ducted Wind Turbine Using RSM and GA, to Increase Power Coefficient of a Small-Scale Horizontal Axis Wind Turbine,” Energy, vol. 269, 2023.
[CrossRef] [Google Scholar] [Publisher Link]
[29] Ngwarai Shambira, Golden Makaka, and Patrick Mukumba, “Velocity Augmentation Model for an Empty Concentrator-Diffuser-Augmented Wind Turbine and Optimisation of Geometrical Parameters Using Surface Response Methodology,” Sustainability, vol. 16, no. 4, pp. 1-30, 2024.
[CrossRef] [Google Scholar] [Publisher Link]
[30] Ravi Anant Kishore, Thibaud Coudron, and Shashank Priya, “Small-Scale Wind Energy Portable Turbine (SWEPT),” Journal of Wind Engineering and Industrial Aerodynamics, vol. 116, pp. 21-31, 2013.
[CrossRef] [Google Scholar] [Publisher Link]
[31] Kamyar Mansour, and Peyman Meskinkhoda, “Computational Analysis of Flow Fields around Flanged Diffusers,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 124, pp. 109-120, 2014.
[CrossRef] [Google Scholar] [Publisher Link]
[32] Aly M. El-Zahaby et al., “CFD Analysis of Flow Fields for Shrouded Wind Turbine’s Diffuser Model with Different Flange Angles,” Alexandria Engineering Journal, vol. 56, no. 1, pp. 171-179, 2017.
[CrossRef] [Google Scholar] [Publisher Link]
[33] B.L. Gilbert, and K.M. Foreman, “Experiments with a Diffuser-Augmented Model Wind Turbine,” Journal of Energy Resources Technology, vol. 105, no. 1, pp. 46-53, 1983.
[CrossRef] [Google Scholar] [Publisher Link]
[34] Toshio Matsushima, Shinya Takagi, and Seiichi Muroyama, “Characteristics of a Highly Efficient Propeller Type Small Wind Turbine with a Diffuser,” Renewable Energy, vol. 31, no. 9, pp. 1343-1354, 2006.
[CrossRef] [Google Scholar] [Publisher Link]
[35] A. Tourlidakis et al., “Aerodynamic Design and Analysis of a Flanged Diffuser Augmented Wind Turbine,” Turbo Expo: Power for Land, Sea, and Air, pp. 1-10, 2013.
[CrossRef] [Google Scholar] [Publisher Link]
[36] Yuji Ohya et al., “Numerical Studies of Flow Around a Wind Turbine Equipped with a Flanged-Diffuser Shroud Using an Actuator-Disk Model,” Wind Engineering, vol. 36, no. 4, pp. 455-472, 2012.
[CrossRef] [Google Scholar] [Publisher Link]
[37] S.A.H. Jafari, and B. Kosasih, “Flow Analysis of Shrouded Small Wind Turbine with a Simple Frustum Diffuser with Computational Fluid Dynamics Simulations,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 125, pp. 102-110, 2014.
[CrossRef] [Google Scholar] [Publisher Link]
[38] Bilal Ahmed Soomro, Ateeque Ahmed, and Ahmad Hussain, “Modelling and Simulation of Diffuser Augmented Wind Turbine (DAWT),” 4th International Conference on Energy Environment and Sustainable Energy, pp. 1-7, 2016.
[Google Scholar]
[39] K. Abe et al., “Experimental and Numerical Investigations of Flow Fields behind a Small Wind Turbine with a Flanged Diffuser,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 93, no. 12, pp. 951-970, 2005.
[CrossRef] [Google Scholar] [Publisher Link]
[40] F. Wang et al., “The Methodology for Aerodynamic Study on a Small Domestic Wind Turbine with a Scoop,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 96, no. 1, pp. 1-24, 2008.
[CrossRef] [Google Scholar] [Publisher Link]
[41] T.Y. Chen, Y.T. Liao, and C.C. Cheng, “Development of Small Wind Turbines for Moving Vehicles: Effects of Flanged Diffusers on Rotor Performance,” Experimental Thermal and Fluid Science, vol. 42, pp. 136-142, 2012.
[CrossRef] [Google Scholar] [Publisher Link]
[42] Ken-ichi Abe, and Yuji Ohya, “An Investigation of Flow Fields Around Flanged Diffusers using CFD,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 92, no. 3-4, pp. 315-330, 2004.
[CrossRef] [Google Scholar] [Publisher Link]
[43] Montaser Abd El Sattar et al., “Economic Valuation of Electrical Wind Energy in Egypt Based on Levelized Cost of Energy,” International Journal of Renewable Energy Research, vol. 10, no. 4, pp. 1-13, 2020.
[CrossRef] [Google Scholar] [Publisher Link]
[44] Tabassum-Abbasi et al., “Wind Energy: Increasing Deployment, Rising Environmental Concerns,” Renewable and Sustainable Energy Reviews, vol. 31, pp. 270-288, 2014.
[CrossRef] [Google Scholar] [Publisher Link]
[45] Balasem Abdulameer Alquraishi et al., “Review on Diffuser Augmented Wind Turbine (DAWT),” International Journal of Integrated Engineering, vol. 11, no. 1, pp. 178-206, 2019.
[Google Scholar] [Publisher Link]
[46] Alessandro Bianchini et al., “Current Status and Grand Challenges for Small Wind Turbine Technology,” Wind Energy Science, vol. 7, no. 5, pp. 2003-2037, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[47] R.C. Bansal, T.S. Bhatti, and D.P. Kothari, “On Some of the Design Aspects of Wind Energy Conversion Systems,” Energy Conversion and Management, vol. 43, no. 16, pp. 2175-2187, 2002.
[CrossRef] [Google Scholar] [Publisher Link]
[48] Sanaa El Mouhsine et al., “Aerodynamics and Structural Analysis of Wind Turbine Blade,” Procedia Manufacturing, vol. 22, pp. 747-756, 2018.
[CrossRef] [Google Scholar] [Publisher Link]
[49] Wang Xudong et al., “Shape Optimization of Wind Turbine Blades,” Wind Energy, vol. 12, no. 8, pp. 781-803, 2009.
[CrossRef] [Google Scholar] [Publisher Link]
[50] R.S. Amano, and Ryan Malloy, “Design of Small Wind Turbine,” Proceedings of the ASME 2008 Fluids Engineering Division Summer Meeting Collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences, Florida, USA, 2008.
[CrossRef] [Google Scholar] [Publisher Link]
[51] K.B. Katnam et al., “Composite Repair in Wind Turbine Blades: An Overview,” The Journal of Adhesion, vol. 91, no. 1-2, pp. 113-139, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[52] Nina Vojdani, and Felix Lootz, “Designing Supply Chain Networks for the Offshore Wind Energy Industry,” International Journal of Business Performance and Supply Chain Modelling, vol. 4, no. 3-4, pp. 271-284, 2012.
[CrossRef] [Google Scholar] [Publisher Link]