Impulse Turbine with Self-Pitch-Controlled Tandem Guide Vanes for Wave Energy Conversion

Setoguchi, Toshiaki; Maeda, Hideaki; Kaneko, Kenji; Kim, Tae Whan; Inoue, M.

doi:10.3154/jvs.13.supplement1_135

Cited by 17 publications

(31 citation statements)

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“…The steady flow characteristics of the turbine in Figures 7(a) and (b) are assumed to be valid for computing performance under unsteady flow conditions. Such a quasisteady analysis has been validated by previous studies [13,14]. In the calculation, flow rates through the two turbines are obtained by using the steady flow characteristics and solving these simultaneous equations.…”

Section: Estimation Methods Of Turbine Characteristics Under Sinusoidamentioning

confidence: 89%

Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

Okuhara¹,

Takao²,

Takami³

et al. 2013

OJFD

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Wells turbine has inherent disadvantages in comparison with conventional turbines: relative low efficiency at high flow coefficient and poor starting characteristics. To solve these problems, the authors propose Wells turbine with booster turbine for wave energy conversion, in order to improve the performance in this study. This turbine consists of three parts: a large Wells turbine, a small impulse turbine with fixed guide vanes for oscillating airflow, and a generator. It was conjectured that, by coupling the two axial flow turbines together, pneumatic energy from oscillating airflow is captured by Wells turbine at low flow coefficient and that the impulse turbine gets the energy at high flow coefficient. As the first step of this study on the proposed turbine topology, the performance of turbines under steady flow conditions has been investigated experimentally by model testings. Furthermore, we estimate mean efficiency of the turbine by quasi-steady analysis.

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Section: Estimation Methods Of Turbine Characteristics Under Sinusoidamentioning

confidence: 89%

Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

Okuhara¹,

Takao²,

Takami³

et al. 2013

OJFD

Self Cite

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“…In this case only the splitter vanes make an oscillating motion, upstream splitter vanes playing as nozzle and downstream ones as diffuser (Setoguchi et al, 1994). As a result of the model test of this turbine in a sinusoidally oscillating flow, higher turbine efficiency was obtained than the most efficient Wells turbine (Wells turbine with guide vanes) tested in the same test rig with the same size of rotor as the impulse turbine.…”

Section: Introductionmentioning

confidence: 87%

“…COMPARISON WITH EXPERIMENTAL RESULTS Table I shows the geometrical parameters of the test turbines investigated in the past (Setoguchi et al, 1994 In Fig. 5, the mean turbine efficiency from Eq.…”

Section: One-dimensional Analysismentioning

confidence: 99%

“…In the first proposed air turbine with self-pitchcontrolled guide vane (Kim et al, 1988), it was found by the model test that the diffuser efficiency was low due to improper movement of the downstream guide vanes (Setoguchi et al, 1993). Accordingly improved version was proposed introducing splitter vanes into the guide vanes as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The guide vanes were forced to oscillate automatically by the reciprocating air flow to operate as nozzle and diffuser. The model tests of the impulse turbine have been carried out to develop an efficient low speed air turbine for wave power generator (Kim et al, 1988;Setoguchi et al, 1993;1994;Maeda et al, 1995). In this paper a simple onedimensional theory is proposed to estimate the performance of the impulse turbine, and possibility of an improvement of the turbine performance is discussed.…”

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confidence: 99%

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One‐dimensional Analysis of Impulse Turbine with Self‐pitch‐controlled Guide Vanes for Wave Power Conversion

Inioue

Kaneko

Setoguchi

1998

International Journal of Rotating Machinery

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A classical one-dimensional analysis in turbomachinery was presented to estimate aerodynamic characteristics of an impulse turbine with self-pitch-controlled guide vanes which is proposed by the authors for ocean wave power conversion. With some simplified assumptions, the efficiency vs/flow-rate coefficient curves were calculated and compared with the experimental results both in a unidirectional steady flow condition and a sinusoidally oscillating flow condition. The estimated results reveal a behavior of the actual characteristics curve of the turbine. Possibility of further improvement in efficiency was discussed from a viewpoint of specific speed and specific diameter. For higher wave energy density, the use ofimpulse turbine is more reasonable because it operates with higher pressure drop at high efficiency. The authors had proposed an impulse turbine with self-pitchcontrolled guide vanes, which were set at both sides of the rotor blade. The guide vanes were forced to oscillate automatically by the reciprocating air flow to operate as nozzle and diffuser. The model tests of the impulse turbine have been carried out to develop an efficient low speed air turbine for wave power generator (Kim et al., 1988;Setoguchi et al., 1993;1994;Maeda et al., 1995). In this paper a simple onedimensional theory is proposed to estimate the performance of the impulse turbine, and possibility of an improvement of the turbine performance is discussed.

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Wells turbine for wave energy conversion: a review

Shehata

Xiao

Saqr

et al. 2016

Int. J. Energy Res.

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Summary In the past 20 years, the use of wave energy systems has significantly increased, generally depending on the oscillating water column concept. Wells turbine is one of the most efficient oscillating water column technologies. This article provides an updated and a comprehensive account of the state‐of‐the‐art research on Wells turbine. Hence, it draws a roadmap for the contemporary challenges, which may hinder future reliance on such systems in the renewable energy sector. In particular, the article is concerned with the research directions and methodologies, which aim at enhancing the performance and efficiency of Wells turbine. The article also provides a thorough discussion of the use of CFD for performance modeling and design optimization of Wells turbine. It is found that a numerical model using the CFD code can be employed successfully to calculate the performance characteristics of W‐T as well as other experimental and analytical methods. The increase of research papers about CFD, especially in the last 5 years, indicates that there is a trend that considerably depends on the CFD method. Copyright © 2016 John Wiley & Sons, Ltd.

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Impulse Turbine with Self-Pitch-Controlled Tandem Guide Vanes for Wave Energy Conversion

Cited by 17 publications

References 0 publications

Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

Wells Turbine for Wave Energy Conversion —Improvement of the Performance by Means of Impulse Turbine for Bi-Directional Flow

One‐dimensional Analysis of Impulse Turbine with Self‐pitch‐controlled Guide Vanes for Wave Power Conversion

Wells turbine for wave energy conversion: a review

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