The effect of the guide vane number and inclined angle on the performance improvement of a low head propeller turbine

Recent research has shown that four-quadrant turbines are required to achieve maximum net energy production in a tidal barrage plant. These turbines can generate electricity in both flow directions and are capable of pumping. An innovative turbine concept is being reviewed in the course of the Eurostars research project Safe*Coast. This project proposes to install a turbine in a reversible cylinder in order to allow for fourquadrant operation. To evaluate the feasibility of the concept, the authors designed a compact low head axial tidal turbine with the aid of CFD simulations. This paper presents the methods used in the design and optimization process of the turbine. It also describes numerically obtained turbine characteristics, and cavitation limits. The most critical requirements of the turbine include high efficiency in turbine and pumping mode and safe cavitation properties. By computing steady state CFD simulations of the turbine stage, an extensive set of geometries was analyzed. The authors optimized the turbine performance by adjusting the meridional section, as well as runner blade and guide vane profiles and angles along with other related parameters. Transient simulations of the whole setup, including the inlet and draft tube geometries, were performed in order to study transient effects. The final design after optimization is a three bladed axial turbine with adjustable guide vanes and a rim generator. The turbine’s symmetrical inlet and outlet geometry and its relative compactness permit its integration in a reversible cylinder. The simulation results are very positive and indicate that all the relevant design criteria are satisfied. As a result, the project will continue into a new phase in which a model of the turbine will be built for physical testing in order to verify the results and to conduct further investigations.

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Study on Performance Improvement of Wind Turbine by Application of FGV (Flexible Guide Vane) in High Wind

Marine Engineering ◽

10.5988/jime.49.194 ◽

2014 ◽

Vol 49 (2) ◽

pp. 194-195

Author(s):

Ken-ichi Kaneko ◽

Ryou Okada

Keyword(s):

Wind Turbine ◽

Performance Improvement ◽

Guide Vane ◽

High Wind

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Performance Improvement of Cross-Flow Turbine with a Cylindrical Cavity and Guide Wall

Journal of Fluids Engineering ◽

10.1115/1.4052046 ◽

2021 ◽

Author(s):

Naoto Ogawa ◽

Mirei Goto ◽

Shouichiro Iio ◽

Takaya Kitahora ◽

Young-Do Choi ◽

...

Keyword(s):

Performance Improvement ◽

Performance Test ◽

Guide Vane ◽

Cross Flow ◽

Maximum Efficiency ◽

Small Hydropower ◽

Turbine Efficiency ◽

Partial Load ◽

Guide Wall ◽

The Cross

Abstract The cross-flow turbine has been utilizing the development of small hydropower less than about 500kW in the world. The turbine cost is lower than the other turbines because of its smaller assembled parts and more straightforward structures. However, the maximum efficiency of the cross-flow turbine is lower than that of traditional turbines. Improving the turbine efficiency without increasing manufacturing costs is the best way to develop small hydropower in the future. This study is aiming to improve the turbine efficiency at the design point and partial load. The runner&amp;amp;#39;s outflow angle varies with turbine speed and guide vane opening in the typical cross-flow turbine. The tangential velocity component remains in the outflow in these conditions; thus, change the outflow direction along the runner&amp;amp;#39;s radial direction is helpful for performance improvement. The authors experimentally change the desirable outflow angle by attaching a cavity and a guide wall at the outside casing tip. The turbine performance test was conducted for various turbine speeds and guide vane opening. Next, flow visualization around the runner was performed. As a result, the effect of the cavity and the guide wall can be revealed. The outlet flow fields are different by attaching the cavity and the guide wall, especially between the partial and optimum load conditions.

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Hot Turbine Guide Vane Performance Improvement With Metal Additive Manufacturing at Siemens Energy

10.1115/gt2021-59523 ◽

2021 ◽

Author(s):

Ilya Fedorov ◽

Dikran Barhanko ◽

Magnus Hallberg ◽

Martin Lindbaeck

Keyword(s):

Additive Manufacturing ◽

Gas Turbine ◽

Performance Improvement ◽

Guide Vane ◽

Original Design ◽

Trailing Edges ◽

Portfolio Development ◽

Turbine Guide Vane ◽

Actual Operation

Abstract Additive manufacturing (AM) of gas turbine components has been suggested as a measure to improve performance and create other value additions in several research papers. This paper focuses on application of AM for gas turbine performance improvement considering industrial scale of this activity at Siemens Energy. Efficient cooling designs, made possible by AM, are considered not only from the standpoint of cooling characteristics, but also inherent challenges, arising in the complete chain of manufacturing processes: from powder removal to coating. Practical limitations of cooling scheme complexity are discussed and the benefits of in-wall cooling, enabled by AM, are described. It is shown that thin cooled trailing edges, enabled by the AM, provide considerable reduction of losses. It is demonstrated that production challenges can be successfully overcome, and the components can be manufactured with the required quantity and according to the original design intent. The sequence and progress of AM components long-term validation in the field engines are discussed and illustrated with actual operation experience. The development of the AM vane was executed in line with the roadmap of AM portfolio development in Siemens Energy and supports the strategy of commercial validation and full commercial release of AM components..

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754 Performance Improvement of the Savonius Hydraulic Turbine with a Guide Vane

The Proceedings of Yamanashi District Conference ◽

10.1299/jsmeyamanashi.2008.223 ◽

2008 ◽

Vol 2008 (0) ◽

pp. 223-224

Author(s):

Chika SONODA ◽

Fuminori UCHIYAMA ◽

Shouichiro IIO ◽

Toshihiko IKEDA

Keyword(s):

Performance Improvement ◽

Guide Vane ◽

Hydraulic Turbine

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Comparative Study on Performance of Very Low Head Axial Hydraulic Turbine Using a Single Rotor and a Contra-Rotating Rotor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.758.165 ◽

2015 ◽

Vol 758 ◽

pp. 165-172 ◽

Cited By ~ 2

Author(s):

Abdul Muis ◽

Priyono Sutikno ◽

Aryadi Suwono ◽

Firman Hartono

Keyword(s):

Comparative Study ◽

Rotor Blade ◽

High Efficiency ◽

Guide Vane ◽

Axial Flow ◽

Hydraulic Turbine ◽

Operating Conditions ◽

Total Power ◽

Numerical Studies ◽

Low Head

Studies conducted on axial flow hydraulic turbine by comparing the performance of turbines which use a single rotor and two rotors that rotate in opposite (contra-rotating). Both turbines are designed to generate energy utilizing a very low head water flow. Single rotor turbine consists of one row of guide vane and one row of rotor blade. Contra-rotating rotor turbine consists of one row of guide vane and two rows of rotor blade, which is the front rotor blade also serves as a guide vane for the rear rotor. Both of turbines are designed for the same flow and operating conditions. The results of numerical studies show that both of turbines can be applied with a fairly high efficiency, however the single rotor turbine is significantly higher. Especially for contra-rotating turbine, the total power that generated at the same operating conditions will increase because powers are resulted from both of rotors, but the effective head required will be significantly increase compare to the single-rotor turbine. These results may be used as a reference in the development of axial flow hydraulic turbine for very low head sites to expand the applications. Keywords: Single rotor, contra-rotating rotor, axial flow, very low head, hydraulic turbine.

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