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Title: Computational optimization of adaptive hybrid Darrieus turbine : part 1
Authors: Kumar, Palanisamy Mohan
Surya, Mohan Ram
Sivalingam, Krishnamoorthi
Lim, Teik-Cheng
Ramakrishna, Seeram
Wei, He
Keywords: Science::General
Issue Date: 2019
Source: Kumar, P. M., Surya, M. R., Sivalingam, K., Lim, T.-C., Ramakrishna, S., & Wei, H. (2019). Computational optimization of adaptive hybrid Darrieus turbine : part 1. Fluids, 4(2), 90-. doi:10.3390/fluids4020090
Journal: Fluids 
Abstract: Darrieus-type Vertical Axis Wind Turbines (VAWT) are promising for small scale decentralized power generation because of their unique advantages such as simple design, insensitive to wind direction, reliability, and ease of maintenance. Despite these positive aspects, poor self-starting capability and low efficiency in weak and unsteady winds deteriorate further development. Adaptive Hybrid Darrieus Turbine (AHDT) was proposed by the author in the past study as a potential solution to enhance low wind speed characteristics. The objective of the current research is to optimize the parameters of AHDT. AHDT integrates a dynamically varying Savonius rotor with a Darrieus rotor. A fully detailed 2D numerical study employing Reynold-Averaged Navier Stokes (RANS) is carried out to investigate the impact of the Darrieus rotor diameter (DR) on the Savonius rotor (DT) with regard to hybrid turbine performance. The power coefficient of the Darrieus rotor is evaluated when the Savonius rotor is in the closed condition (cylinder) of various diameters. The influence of Reynolds number (Re) on the torque coefficient is examined. Power loss of 58.3% and 25% is reported for DR/DT ratio of 1.5 and 2 respectively for AHDT with solidity 0.5 at 9 m/s. The flow interaction between the Savonius rotor in closed configuration reveals the formation of von Karman vortices that interact with Darrieus blades resulting in flow detachment. An optimum diametrical ratio (DR/DT) of 3 is found to yield the maximum power coefficient of the Darrieus rotor.
ISSN: 2311-5521
DOI: 10.3390/fluids4020090
Rights: © 2019 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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