Performance of an impulse turbine with fixed guide vanes for wave power conversion
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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TL;DR: In this paper, the authors presented the aerodynamic theory of axial-flow turbines and applied it to the Wells turbine and the impulse turbine, including their variants, in order to analyze their integration into the OWC wave energy converter.
Abstract: Air turbines are used to equip oscillating water column wave energy converters. In almost every case, self-rectifying turbines have been adopted which do not require non-return valves to rectify the reciprocating air flow induced by the water column oscillations. The most frequently used or proposed self-rectifying air turbines are the Wells turbine and the impulse turbine, both of axial-flow type. The fundamentals of the aerodynamic theory of axial-flow turbines are presented and then applied to the Wells turbine and the impulse turbine, including their variants. Information is given on methods of, and results from, air turbine model testing, as well as on self-rectifying air turbines that equipped or equip prototypes tested in the sea. The final part of the chapter is devoted to the analysis of turbine integration into OWC wave energy converter.
49 citations
TL;DR: In this paper, a bidirectional flow impulse-turbine used in a wave energy harvesting system has efficiency less than 40%, and it is required to design the turbine for a higher efficiency.
43 citations
TL;DR: In this paper, a review of recent developments in the CFD modeling, geometry optimization, and performance enhancement of axial-flow wave energy converters has been presented, with a focus on axial flow self-rectifying turbines.
37 citations
TL;DR: In this paper, an oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power, both reaction (mainly Wells turbine) and impulse type turbines are tested in oscilla.
Abstract: Oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power. Both reaction (mainly Wells turbine) and impulse type turbines are tested in oscilla...
33 citations
Cites background from "Performance of an impulse turbine w..."
...Results from other numerical analyses indicate that maximum efficiency occurs for a guide vane angle of 30° (Maeda et al., 1999, 2001)....
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TL;DR: In this paper, a bidirectional impulse turbine used in a wave energy device is simulated using a CFD technique and a shape optimization performed with multiple surrogates-assisted multi-objective evolutionary algorithm.
Abstract: In this work, a bidirectional impulse turbine used in a wave energy device is simulated using a CFD technique and a shape optimization performed with multiple surrogates-assisted multi-objective evolutionary algorithm. The surrogates have been generated using the validated CFD technique. The objectives for the optimization are to maximize the shaft power and to minimize the pressure drop across the turbine. The hub and the tip thickness of the rotor blade profiles are modified and considered as the design variables. The Latin hypercube sampling technique generated design points are evaluated in the CFD solver, the objective responses are used to construct multiple surrogates, and a Pareto optimal front is generated through a multi-objective optimization approach. The turbine efficiency, which is the function of pressure drop and shaft power, is relatively increased by 10.4%.Abbreviations: BPS: best PRESS; GV: Guide vane; KRG: kriging; LE: leading edge; MOO: multi-objective optimization; OWC: oscil...
32 citations
Cites background or methods or result from "Performance of an impulse turbine w..."
...The reference geometry and profile parameters for bidirectional impulse turbine geometry are taken from an article of Maeda et al. (1999)....
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...An impulse turbine with GVs gives better performance than a turbine without GV (Maeda et al., 1999)....
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...The mesh was generated several times and checked if the results matches well with the experimental results of Maeda et al. (1999), and gives stable results....
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...The performance of the impulse turbine under steady conditions is computed by the following non-dimensional parameters (Maeda et al., 1999): Input coefficient, CA = 2 PQ ρa(v2a + U2R)blrzva (2) Torque coefficient, CT = 2To ρa(v2a + U2R)blrzrR (3) Flow coefficient,ϕ = Va/UR (4) Efficiency, η = Psh…...
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References
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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
01 Jan 1998
47 citations
12 May 1986
38 citations