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Author

Palanisamy Mohan Kumar

Bio: Palanisamy Mohan Kumar is an academic researcher from Nanyang Technological University. The author has contributed to research in topics: Turbine & Wind power. The author has an hindex of 6, co-authored 9 publications receiving 61 citations.

Papers
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Journal ArticleDOI
02 Aug 2019
TL;DR: In this article, a comprehensive review of proposed concepts with the focus set on the low wind speed performance and critically assessing their applicability based on economics, reliability, complexity, and commercialization aspects is presented.
Abstract: Small wind turbines are key devices for micro generation in particular, with a notable contribution to the global wind energy sector. Darrieus turbines, despite being highly efficient among various types of vertical axis turbines, received much less attention due to their starting characteristics and poor performance in low wind speeds. Radically different concepts are proposed as a potential solution to enhance the performance of Darrieus turbine in the weak wind flows, all along the course of Darrieus turbine development. This paper presents a comprehensive review of proposed concepts with the focus set on the low wind speed performance and critically assessing their applicability based on economics, reliability, complexity, and commercialization aspects. The study is first of its kind to consolidate and compare various approaches studied on the Darrieus turbine with the objective of increasing performance at low wind. Most of the evaluated solutions demonstrate better performance only in the limited tip speed ratio, though they improve the low wind speed performance. Several recommendations have been developed based on the evaluated concepts, and we concluded that further critical research is required for a viable solution in making the Darrieus turbine a low speed device.

14 citations

Journal ArticleDOI
TL;DR: In this article, Savonius wind turbines have distinct advantages in terms of simplicity, low noise, and ease of manufacturing, yet they are not preferred for large-scale power generation due to their lower aerodyna.
Abstract: Savonius wind turbines have distinct advantages in terms of simplicity, low noise, and ease of manufacturing, yet they are not preferred for large-scale power generation due to their lower aerodyna...

14 citations

Proceedings ArticleDOI
01 Oct 2017
TL;DR: The results indicate the novel dual rotor do improve the self-starting capability at the expense of reduced power performance.
Abstract: Darrieus type vertical axis wind turbines are preferred for the small scale distributed power generation for their distinctive advantages, yet these lift based turbines suffers from poor self-starting capability. As a potential solution, a Dual rotor Darrieus Turbine (DD) with secondary rotor in addition to the primary rotor has been proposed to improve the self-starting characteristics and to enhance the low wind speed performance. The current study experimentally evaluates the proposed rotor with two set of blades as a possible means of achieving higher static torque and thus promoting self-starting capability. Albeit, the design parameters for the secondary rotor such as solidity, appropriate airfoil, secondary rotor diameter, secondary rotor offset with respect to primary rotor requires extensive optimization, the current preliminary study is focused on the feasibility check of the DD turbine. Power coefficient, dynamic and static torque coefficient are obtained through wind tunnel test and compared with Conventional Darrieus (CD) turbine (only with primary rotor). The results indicate the novel dual rotor do improve the self-starting capability at the expense of reduced power performance.

13 citations

Journal ArticleDOI
TL;DR: In this paper, a truncated NACA 0018 airfoil with a baseline cavity modification has been introduced to enhance the low wind speed performance of a straight-bladed Darrieus turbine.
Abstract: Darrieus wind turbines are simple lift based machines with exceptionally high efficiencies in terms of power coefficient compared to similar drag based vertical axis turbines. However, in low Reynolds numbers, a notable performance loss was reported. As a potential solution, truncated NACA 0018 airfoil (NACA 0018TC-39) has been introduced with baseline cavity modification to achieve better start-up characteristics and to enhance the low wind speed performance. The baseline cavity will provide an additional benefit of reverse drag at low TSR which is obligatory for low wind speed start-up. Numerical optimization has been carried out on the conceived airfoil NACA 0018TC-39 to find out the effective truncation percentage in terms of the chord. The numerical study has been extended to compare NACA 0018 and NACA 0018TC-39 airfoil for their aerodynamic performances in terms of lift, drag coefficients and separation characteristics. The NACA 0018TC-39 airfoil was incorporated within a non-swept straight bladed Darrieus turbine miniature to experimentally evaluate the performance in terms of dynamic power coefficient, dynamic torque coefficient and static torque coefficient and compared with conventional NACA 0018 airfoil at six different Reynolds numbers 178917, 193827, 208737, 223646, 238556 and 268376. The experimental contrast implied that NACA 0018TC-39 airfoil turbine yielded almost double power coefficients at low Reynolds number compared to conventional NACA 0018 airfoil without hampering its performance at higher Reynolds number.

12 citations

Journal ArticleDOI
07 Aug 2019
TL;DR: In this article, a review of the development of a large vertical axis wind turbine (VAWT) since its naissance to its current applications is presented, where the turbines are critically reviewed in terms of performance, blade configuration, tower design, and mode of failure.
Abstract: The objective of the current review is to present the development of a large vertical axis wind turbine (VAWT) since its naissance to its current applications. The turbines are critically reviewed in terms of performance, blade configuration, tower design, and mode of failure. The early VAWTs mostly failed due to metal fatigue since the composites were not developed. Revisiting those configurations could yield insight into the future development of VAWT. The challenges faced by horizontal axis wind turbine (HAWT), especially in the megawatt capacity, renewed interest in large scale VAWT. VAWT provides a solution for some of the immediate challenges faced by HAWT in the offshore environment in terms of reliability, maintenance, and cost. The current rate of research and development on VAWT could lead to potential and economical alternatives for HAWT. The current summary on VAWT is envisioned to be an information hub about the growth of the Darrieus turbine from the kW capacity to megawatt scale.

11 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the effects of several design parameters including twist angle, overlap ratio, and endplates size ratio, along with the wind velocity on the performance of the Savonius wind turbine are investigated.

62 citations

Journal ArticleDOI
01 Mar 2021-Heliyon
TL;DR: In this paper, the normal n-i-p planar heterojunction structure has been simulated using SCAPS-1D and the influence of various parameters such as the defect density, the thickness of the MAPbI3 layer, the temperature on fill factor, the open-circuit voltage, the short circuit current density, and the power conversion efficiency are investigated and discussed in detail.

60 citations

Journal ArticleDOI
TL;DR: In this paper, a new configuration using twisted blades in multi-stage Savonius rotors is developed to enhance the performance of vertical axis wind turbines, and a comprehensive three-dimensional unsteady incompressible turbulent flow model using Reynolds-Averaged Navier-Stokes equations along with k-ω shear-stress transport turbulence model is developed.

32 citations

Journal ArticleDOI
19 Jun 2020-Energies
TL;DR: In this paper, the authors used the unsteady Reynolds averaged Navier-Stokes (URANS) approach with the k-ω shear stress transport (SST) turbulence model to estimate the H-Darrieus wind turbine aerodynamic performance, aerodynamic blade loads, and velocity profiles downstream behind the rotor.
Abstract: The purpose of this paper is to estimate the H-Darrieus wind turbine aerodynamic performance, aerodynamic blade loads, and velocity profiles downstream behind the rotor The wind turbine model is based on the rotor designed by McDonnell Aircraft Company The model proposed here consists of three fixed straight blades; in the future, this model is planned to be developed with controlled blades The study was conducted using the unsteady Reynolds averaged Navier–Stokes (URANS) approach with the k-ω shear stress transport (SST) turbulence model The numerical two-dimensional model was verified using two other independent aerodynamic approaches: a vortex model and the extended version of the computational fluid dynamics (CFD) code FLOWer All utilized numerical codes gave similar result of the instantaneous aerodynamic blade loads In addition, steady-state calculations for the applied airfoils were also made using the same numerical model as for the vertical axis wind turbine (VAWT) to obtain lift and drag coefficients The obtained values of lift and drag force coefficients, for a Reynolds number of 29 million, agree with the predictions of the experiment and XFOIL over a wide range of angle of attack A maximum rotor power coefficient of 05 is obtained, which makes this impeller attractive from the point of view of further research Research has shown that, if this rotor were to work with fixed blades, it is recommended to use the NACA 1418 airfoil instead of the original NACA 0018

23 citations

Journal ArticleDOI
TL;DR: In this article , the authors proposed a new design method for a Savonius wind turbine to maximize its aerodynamic performance, which automatically achieves solutions to the equations that govern the motion of fluids for different turbines.

16 citations