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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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Journal ArticleDOI
15 Nov 2019-Energy
TL;DR: In this article, a higher order sliding mode controller (HOSMC) was proposed, and its gains were optimized to control through the best efficiency point tracking (BEPT) of the turbine.

14 citations

Journal ArticleDOI
TL;DR: In this paper, the use of a radial turbine to improve the system's efficiency by enhancing flow rectification is presented for the first time, and an experimentally validated numerical model has been used to analyse the flow field of the radial turbine when working in both direct and reverse modes.

13 citations

Journal ArticleDOI
Ying Cui1, Zhen Liu1, Zhang Xiaoxia1, Chuanli Xu1, Hongda Shi1, Kilwon Kim 
TL;DR: In this article, the authors investigated the unsteady behavior of an impulse turbine under various constant-flow conditions, such as the variations in the rotation speed, the pressure drop and the torque output of the turbine starting from rest.

13 citations

Journal ArticleDOI
01 May 2019
TL;DR: In this article, an analysis of the internal flow of a bidirectional turbine gives an idea of the turbine's internal flow, which is used in an oscillating water column wave energy converter.
Abstract: Oscillating water column wave energy converter is having low efficiency because of its principal component, a bidirectional turbine. An analysis of the internal flow of the turbine gives an idea of...

12 citations

Journal ArticleDOI
TL;DR: The Kriging variants such as ordinary, universal, and blind along with commonly used response surface approximation (RSA) model were used in the present problem, to optimize the performance of an air impulse turbine used for ocean wave energy harvesting by CFD analysis.
Abstract: Surrogates are cheaper to evaluate and assist in designing systems with lesser time. On the other hand, the surrogates are problem dependent and they need evaluation for each problem to find a suitable surrogate. The Kriging variants such as ordinary, universal, and blind along with commonly used response surface approximation (RSA) model were used in the present problem, to optimize the performance of an air impulse turbine used for ocean wave energy harvesting by CFD analysis. A three-level full factorial design was employed to find sample points in the design space for two design variables. A Reynolds-averaged Navier Stokes solver was used to evaluate the objective function responses, and these responses along with the design variables were used to construct the Kriging variants and RSA functions. A hybrid genetic algorithm was used to find the optimal point in the design space. It was found that the best optimal design was produced by the universal Kriging while the blind Kriging produced the worst. The present approach is suggested for renewable energy application.

12 citations


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

  • ...Bidirectional flow impulse turbine was chosen as the reference geometry [10] for studying the applicability of surrogate techniques to turbomachinery application....

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  • ...Results and Discussions Figure 4 validates the current CFD result with existing experimental and CFD results for the objective function [10, 16]....

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  • ...The mathematical formulations of the parameters [10, 12] are...

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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