Performance of the Biplane Wells Turbine

1996 ◽  
Vol 118 (3) ◽  
pp. 210-215 ◽  
Author(s):  
L. M. C. Gato ◽  
R. Curran
Keyword(s):  
Experimental Investigation ◽  
Power Plant ◽  
Air Flow ◽  
Mutual Interference ◽  
Wave Power ◽  
Wells Turbine ◽  
Stagger Angle

The paper describes the experimental investigation of the biplane Wells turbine for use on a wave power plant. The performance of the biplane turbine was tested in unidirectional steady air flow by varying the model configurations using solidity, gap-to-chord ratio, and rotor stagger angle. It was found that the gap-to-chord ratio and stagger considerably influenced the performance of the biplane turbine due to the mutual interference between the rotor planes.

Performance of a High-Solidity Wells Turbine for an OWC Wave Power Plant

1996 ◽  
Vol 118 (4) ◽  
pp. 263-268 ◽  
Author(s):  
L. M. C. Gato ◽  
V. Warfield ◽  
A. Thakker
Keyword(s):  
Experimental Investigation ◽  
Power Plant ◽  
Pressure Drop ◽  
Flow Rate ◽  
Aerodynamic Performance ◽  
Wave Power ◽  
Wells Turbine ◽  
Guide Vanes ◽  
Turbine Efficiency ◽  
Pressure Distributions

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.

A Comparison of Biradial and Wells Air Turbines on the Mutriku Breakwater OWC Wave Power Plant

2017 ◽  
Author(s):  
J. C. C. Henriques ◽  
W. Sheng ◽  
A. F. O. Falcão ◽  
L. M. C. Gato
Keyword(s):  
Power Plant ◽  
Wave Energy ◽  
Time Domain ◽  
Guide Vane ◽  
Basque Country ◽  
Domain Model ◽  
Wave Power ◽  
Wells Turbine ◽  
Sharp Drop ◽  
Demonstration Site

The Mutriku breakwater wave power plant is located in the Bay of Biscay, in Basque Country, Spain. The plant is based on the oscillating water column (OWC) principle and comprises 16 air chambers, each of them equipped with a Wells turbine coupled to an electrical generator with a rated power of 18.5 kW. The IDMEC/IST Wave Energy Group is developing a novel self-rectifying biradial turbine that aims to overcome several limitations of the Wells turbine, namely the sharp drop in efficiency above a critical flow rate. The new turbine is symmetrical with respect to a mid-plane perpendicular to the axis of rotation. The rotor is surrounded by a pair of radial-flow guide vane rows. Each guide vane row is connected to the rotor by an axisymmetric duct whose walls are flat discs. In the framework of the “OPERA” European H2020 Project, the new biradial turbine will be tested at Mutriku and later will be installed and tested on a floating OWC wave energy converter — the OCEANTEC Marmok-5’s — to be deployed at BiMEP demonstration site in September of 2017. The aim of the present paper is to perform critical comparisons of the performance of the new biradial and the Wells turbine that is presently installed at Mutriku. This is based on results from a time-domain numerical model. For the purpose, a new hydrodynamic frequency domain model of the power plant was developed using the well know WAMIT software package. This was used to build a time-domain model based on the Cummins approach.

A Sea Trial of Wave Power Plant With Impulse Turbine

2008 ◽  
Author(s):  
Manabu Takao ◽  
Eiji Sato ◽  
Shuichi Nagata ◽  
Kazutaka Toyota ◽  
Toshiaki Setoguchi
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Wave Energy ◽  
Rotational Speed ◽  
Guide Vane ◽  
Wave Power ◽  
Wave Energy Conversion ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Sea Trial

A sea trial of wave power plant using an impulse turbine with coreless generator has been carried out at Niigata-nishi Port, in order to demonstrate usefulness of the turbine for wave energy conversion. Oscillating water column (OWC) based wave power plant has been installed at the side of a breakwater and has an air chamber with a sectional area of 4 m2 (= 2m × 2m). The impulse turbine used in the sea trial has fixed guide vanes both upstream and downstream, and these geometries are symmetrical with respect to the rotor centerline in order to rotate in a single direction in bi-directional airflow generated by OWC. The turbine is operated at lower rotational speed in comparison with conventional turbines. The rotor has a tip diameter of 458 mm, a hub-to-tip ratio of 0.7, a tip clearance of 1 mm, a chord length of 82.8 mm and a solidity of 2.0. The guide vane with chord length of 107.4 mm is symmetrically installed at the distance of 30.7 mm downstream and upstream of the rotor. The guide vane has a solidity of 2.27, a thickness ratio of 0.0279, a guide vane setting angle of 30° and a camber angle of 60°. The generator is coreless type and can generate electricity at lower rotational speed in comparison with conventional generator. The rated and maximum powers of the generator are 450 W and 880 W respectively. The experimental data obtained in the sea trial of wave power plant with the impulse turbine having coreless generator was compared to these of Wells turbine which is the mainstream of the turbine for wave energy conversion. As a result, total efficiency of the plant using the impulse turbine was higher than that of Wells turbine.

Water cycle algorithm–based airflow control for oscillating water column–based wave energy converters

2018 ◽  
Vol 234 (1) ◽  
pp. 118-133 ◽  
Author(s):  
Fares M’zoughi ◽  
Soufiene Bouallègue ◽  
Aitor J Garrido ◽  
Izaskun Garrido ◽  
Mounir Ayadi
Keyword(s):  
Power Plant ◽  
Water Column ◽  
Power Plants ◽  
Water Cycle ◽  
Control Strategies ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Wells Turbine ◽  
Water Cycle Algorithm ◽  
Control Approach

The stalling behavior is a feature of the Wells turbine that limits the generated output power of power plants using this turbine. The NEREIDA wave power plant installed in the harbor of Mutriku in the northern Spanish shoreline constitutes an excellent example of this phenomenon. This article deals with the modeling, simulation and control of an oscillating water column unit within the NEREIDA wave power plant. The stalling behavior is investigated and two control strategies are proposed to avoid it. The first control approach is the airflow control which aims to adjust the airflow in the turbine duct using a proportional–integral–derivative controller tuned with the water cycle algorithm. The second control approach is the rotational speed control adjusting the rotor speed using the rotor-side converter of the back-to-back converter which is wired to the doubly fed induction generator. Results of comparative studies show a power generation improvement even relative to the real measured data.

II-1 On the cross flow turbine for wave power plant (1st report, the characteristics of the turbine in steady air flow)

1985 ◽  
Vol 12 (6) ◽  
pp. 562
Author(s):  
Masahiko Akabane ◽  
Haruyuki Suzuki ◽  
Kunihiko Yamauchi
Keyword(s):  
Power Plant ◽  
Air Flow ◽  
Cross Flow ◽  
Wave Power ◽  
The Cross

Thermo-flow characteristics and air flow field leading of the air-cooled condenser cell in a power plant

2011 ◽  
Vol 54 (9) ◽  
pp. 2475-2482 ◽  
Author(s):  
WanXi Zhang ◽  
LiJun Yang ◽  
XiaoZe Du ◽  
YongPing Yang
Keyword(s):  
Power Plant ◽  
Flow Field ◽  
Air Flow ◽  
Flow Characteristics

Designing a Novel Controller for Boiler Pressure

2010 ◽  
Author(s):  
Mohammad Reza Gharib ◽  
Iman Dabzadeh ◽  
Seyyed Alireza Seyyed Mousavi
Keyword(s):  
Robust Control ◽  
Power Plant ◽  
Air Flow ◽  
Practical Method ◽  
Robust Controller ◽  
Pressure System ◽  
Nonlinear Simulation ◽  
Precise Control ◽  
Fuel Flow ◽  
Successful Design

In this paper, a practical method to design a robust controller for pressure of boiler in Mashhad Power plant using Quantitative Feedback Theory (QFT) is proposed. In reality fuel flow, air flow and pressure of boiler are three dependent parameters which must control in every power plant. The boiler pressure system has uncertain mathematical model. Uncertainties in mentioned model are caused by lack of knowledge about the dynamics of the system, pay load changes, air flow. Thus, application of robust control methods for high precise control of pressure is inevitable. In the first step plant is converted into a group of linear uncertain plants. Then, a controller is designed for tracking problem and disturbance rejection. Finally, nonlinear simulation has been carried out which indicates successful design of controllers and pre-filters. The research demonstrates that applying the proposed technique successfully overcomes obstacles for robust control of pressure of the Power plant.

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