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Journal ArticleDOI

Performance of an impulse turbine with fixed guide vanes for wave power conversion

01 Aug 1999-Renewable Energy (Elsevier)-Vol. 17, Iss: 4, pp 533-547
TL;DR: In this article, a simple fixed geometry impulse turbine has been studied as a suitable power converter in Oscillating Water Column based wave power plants and the optimum guide vane angle for maximum efficiency has been arrived at based on the five angles tested.
About: This article is published in Renewable Energy.The article was published on 1999-08-01. It has received 76 citations till now. The article focuses on the topics: Wells turbine & Turbine.
Citations
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Dissertation
01 Jan 2012
TL;DR: Acknowledgements and acknowledgements as discussed by the authors Table of contents and table of contents Table of tables Table of Table of Tables Table of Figures Table of figures Table of Nomenclature Table of names
Abstract: ................................................................................................................................. i Acknowledgements ............................................................................................................... ii Table of contents ................................................................................................................. iii Table of tables ....................................................................................................................... x Table of figures .................................................................................................................... xi Nomenclature................................................................................................................... xviii

1 citations


Cites background or methods or result from "Performance of an impulse turbine w..."

  • ...Despite the favourable performance noted in laboratory testing for the linked guide vane system, operating life and maintenance issues were confirmed with prototype testing of the self-pitching linked guide vanes in Vizhinjam, South India, by the National Institute of Chapter 2 41 Ocean Technology (NIOT) (Maeda et al. 1999)....

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  • ...In 1991, a 110 kW demonstration plant was built in Vizhinjam, South India, by the National Institute of Ocean Technology (NIOT)....

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  • ...It has been concluded through CFD analysis that a guide vane setting angle of 30º results in optimum performance (Setoguchi et al. 2001a, Abugihalia 2002) and this confirmed the experimental results carried out by Maeda et al. (1999)....

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  • ...An optimum ratio of major axis to minor axis of the elliptical curve of 3 was established by Maeda et al. (1995) and confirmed by Setoguchi et al. (2001b). This is derived from the optimum blade inlet angle which will be discussed in the next section....

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  • ...An optimum ratio of major axis to minor axis of the elliptical curve of 3 was established by Maeda et al. (1995) and confirmed by Setoguchi et al....

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Journal ArticleDOI
01 May 2021
TL;DR: In this article, the oscillating water column (OWC) based wave energy devices require a turbine for the conversion of wave energy to electrical energy, which has been widely used in the past.
Abstract: The oscillating water column (OWC) based wave energy devices require a turbine for the conversion of wave energy to electrical energy. Customarily, Wells and impulse turbines have been widely accep...

1 citations


Cites methods from "Performance of an impulse turbine w..."

  • ...The fixed GVs BDI consists of 30 rotor blades (RBs) and 26 GVs....

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  • ...Two different turbines were modeled and the geometry of those turbines was extracted from the literature.9,14 The geometry of both the turbines is the same except for the number of RBs and GVs....

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  • ...The first BDI considered for numerical simulations was the reference turbine proposed during the late 1990s which consists of 30 RBs and 26 GVs.(7) The simulations were validated with the experimental results....

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  • ...This numerical methodology was extended to the optimized (second) turbine proposed during 2015 which comprises 38 RBs and 24 GVs.9 Detailed flow physics has been presented for both the turbines and a pressure drop chart was plotted based on the volume flow rate....

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  • ...To capture the boundary layer effect, very fine grids were imposed near the blade walls of the rotor and GVs....

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Journal ArticleDOI
01 Mar 2023-Energy
TL;DR: In this paper , a self-rectifying impulse turbine with U-shaped duct is proposed for oscillating water column wave energy conversion, which has a pair of fixed, symmetrical and radial-flow guide vane rows, and an axisymmetric, U-shape duct with increasing cross-sectional area from the rotor to the guide vanes, therefore it is expected to be relatively simple, reliable and efficient.
Journal Article
TL;DR: In this article, an oscillating water column energy extraction system based on uni-directional axial impulse turbine with a novel rectifying system arrangement was designed to minimize the losses due to downstream guide vanes and in turn shoot up the power output for low wave height conditions.
Abstract: For continuous and uninterrupted extraction of energy from marine wave motion, majority of wave energy extraction systems employ bi-directional turbines. The aerodynamic loss due to symmetrical placement of guide vanes causes a major loss in power output of the system. To optimize this problem, researchers have developed and tested a variety of oscillating water column air turbines. Most commonly used are the axial turbines because of their simplicity and operational ease. The present work focuses upon design of an oscillating water column energy extraction system based on uni-directional axial impulse turbine with a novel rectifying system arrangement which primarily focuses to minimize the losses due to downstream guide vanes and in turn shoot up the power output for low wave height conditions. A numerical model was developed and investigated using RANS equations and k-omega SST turbulence model. The results obtained portrays that the proposed flap based bi-directional impulse system is operationally viable and produces substantially greater power output in comparison to conventional bi-directional and uni-directional turbine systems under low wave height conditions. A hybrid choking scheme was followed which resulted in additional power output. Results show that full choking of the idle turbine is ensured during the inhalation cycle, which was not possible in existing models. During the exhalation cycle, additional power output was also obtained from the secondary turbine i.e., front end turbine during exhalation cycle. The proposed system generates maximum total power output at around flow coefficient of 1.
Proceedings ArticleDOI
28 Jun 2004
TL;DR: In this paper, the effect of guide vanes shape on the performance of the impulse turbine for wave energy conversion was analyzed. And the results showed that the turbine efficiency can be improved by an average of 4.5 percentage points by incorporating 3-D vanes instead of 2-D guides.
Abstract: This paper deals with the computational fluid dynamics (CFD) analysis on effect of guide vane shape on performance of impulse turbine for wave energy conversion. Experiments have been conducted on the impulse turbine to validate the present CFD method and to analyze the aerodynamics in rotor and guide vanes, which demonstrates the necessity to improve the guide vanes shape. As a result, it is seen that the downstream guide vanes make considerable total pressure drop leads low performance of the turbine and hence threedimensional (3-D) inlet and downstream guide vanes have been designed based on wellknown vortex theory to improve efficiency of the turbine. In order to prove the improvement in efficiency due to 3-D guide vanes, CFD analysis has been made on impulse turbine with 2D and 3-D guide vanes for various flow coefficients. As a result, it is seen that the present CFD model can predict the experimental values with reasonable accuracy. Also, it is showed from the numerical results that the efficiency of the turbine can be improved by average of 4.5 percentage points by incorporating 3-D guide vanes instead of 2-D guide vanes. The physical reason for improvement in efficiency of the turbine due to 3-D guide vanes has been explained with the CFD flow insight pictures.
References
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Journal ArticleDOI
TL;DR: In this article, an experimental investigation of the aerodynamic performance of a high-solidity Wells turbine for a wave power plant is presented, and the results show that the presence of guide vanes can provide a remarkable increase in turbine efficiency.
Abstract: The paper describes an experimental investigation, and presents the results of the aerodynamic performance of a high-solidity Wells turbine for a wave power plant. A monoplane turbine of 0.6 m rotor diameter with guide vanes was built and tested. The tests were conducted in unidirectional steady airflow. Measurements taken include flow rate, pressure drop, torque, and rotational speed, as well as velocity and pressure distributions. Experimental results show that the presence of guide vanes can provide a remarkable increase in turbine efficiency.

84 citations

Journal Article
TL;DR: In this article, the performance of an impulse turbine with self-pitch-controlled guide vanes for wave power conversion has been investigated, and the results show that a high-efficiency impulse turbine can be developed by these of guide vane connected by link motions.
Abstract: Experimental investigations directed towards improving the performance of the impulse turbine with self-pitch-controlled guide vanes for wave power conversion are reported. The turbine presented and tested here has an upstream and a downstream guide vane row connected by link motions. The behavior of guide vanes in the reciprocating flows is shown in connection with the axial flow velocity. The results show that a high-efficiency impulse turbine can be developed by these of guide vanes connected by link motions. Furthermore, it is found that the running and starting characteristics of this turbine in the reciprocating flow can be estimated from the performance of the turbine with fixed nozzle and diffuser vanes in a unidirectional steady flow.

59 citations

Journal Article
TL;DR: In this paper, an impulse turbine with self-pitch-controlled guide vanes was investigated experimentally by the use of turbine test equipment in which the sinusoidally reciprocating flow conditions are simulated.
Abstract: An impulse turbine with self-pitch-controlled guide vanes was proposed by the authors in a previous paper. The unsteady characteristics of this turbine have been investigated experimentally by the use of turbine test equipment in which the sinusoidally reciprocating flow conditions are simulated. The results have been compared with those of a Wells turbine. Furthermore, in order to clarify the usefulness of quasi-steady analysis of this turbine, they have been also compared with the analytical results calculated on the basis of the experimental data obtained by the model testing of a turbine rotor with fixed guide vanes under steady unidirectional flow conditions. As a result, it has been clarified that the impulse turbine presented here is superior to the Wells turbine in overall characteristics, and the quasi-steady analysis is available for this turbine.

48 citations