Pressure on a Submerged Plate Undergoing Streamwise Rotation

2017 ◽  
pp. 407-462
Keyword(s):  
Flow Field ◽  
Flat Plate ◽  
Field Tests ◽  
Full Scale ◽  
Bounding Surface ◽  
Submerged Plate ◽  
Close Proximity ◽  
Theoretical Predictions ◽  
Upstream Reservoir ◽  
Vertical Flat Plate

In this chapter theoretical expressions are developed for the pressure loading on a vertical flat plate bounding an upstream reservoir with the plate undergoing rotational streamwise oscillation in close proximity to a bounding surface beneath the plate. The flow field in the reservoir can be decomposed into two parts. The first component of the flow field is due to only the rotational vibratory motion of the rigid weir plate (about some point on the weir plate), while the gate remains entirely closed with no discharge. The second component of the flow field results from the up-and-down vibration of the weir plate. Data from model scale testing in the laboratory and field tests on full-scale Tainter gates show excellent to good agreement with the theoretical predictions, validating the use of the theory.

scholarly journals Rotor Loading Characteristics of a Full-Scale Tidal Turbine

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1035 ◽  
Author(s):  
Magnus Harrold ◽  
Pablo Ouro
Keyword(s):  
Turbulent Flows ◽  
Mechanical Loading ◽  
Full Scale ◽  
Design Stage ◽  
Flow Profile ◽  
Expected Return ◽  
Tidal Turbines ◽  
Theoretical Predictions ◽  
Tidal Turbine

Tidal turbines are subject to highly dynamic mechanical loading through operation in some of the most energetic waters. If these loads cannot be accurately quantified at the design stage, turbine developers run the risk of a major failure, or must choose to conservatively over-engineer the device at additional cost. Both of these scenarios have consequences on the expected return from the project. Despite an extensive amount of research on the mechanical loading of model scale tidal turbines, very little is known from full-scale devices operating in real sea conditions. This paper addresses this by reporting on the rotor loads measured on a 400 kW tidal turbine. The results obtained during ebb tidal conditions were found to agree well with theoretical predictions of rotor loading, but the measurements during flood were lower than expected. This is believed to be due to a disturbance in the approaching flood flow created by the turbine frame geometry, and, to a lesser extent, the non-typical vertical flow profile during this tidal phase. These findings outline the necessity to quantify the characteristics of the turbulent flows at sea sites during the entire tidal cycle to ensure the long-term integrity of the deployed tidal turbines.

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