A5039942564- Wind Energy Research and Development
- Cavitation Phenomena in Pumps
- Wave and Wind Energy Systems
- Fluid Dynamics and Vibration Analysis
- Wind and Air Flow Studies
- Fluid Dynamics and Turbulent Flows
- Coastal and Marine Dynamics
- Computational Fluid Dynamics and Aerodynamics
- Icing and De-icing Technologies
- Forest Biomass Utilization and Management
- Turbomachinery Performance and Optimization
- Flow Measurement and Analysis
- Forest ecology and management
- Climate variability and models
- Advanced Aircraft Design and Technologies
- Vibration and Dynamic Analysis
- Probabilistic and Robust Engineering Design
- Social Acceptance of Renewable Energy
- Meteorological Phenomena and Simulations
- Hydrology and Drought Analysis
- Engineering Applied Research
- Hydraulic and Pneumatic Systems
- Aerodynamics and Acoustics in Jet Flows
- Structural Health Monitoring Techniques
- Spacecraft and Cryogenic Technologies
University of Oxford
2015-2024
Science Oxford
2019-2024
Manitoba Hydro
1973
Low wind speed events represent one of the biggest challenges in fully de-carbonising electricity system due to growing proportion energy UK mix. While reanalysis products are a useful tool study spatio-temporal characteristics these occurrences, their performance and limitations should be understood prior usage. In this study, hourly 10 m ERA5 data were evaluated against in-situ measurements from 205 onshore offshore observation stations around UK. It was found that has biases mean 0.166...
Placing mechanical devices into fast-moving tidal streams to generate clean and predictable electricity is a developing technology. This review covers the fundamental fluid mechanics of this application, which important for understanding how such work they interact with stream resource. We focus on turbines energy generation are modeled analytically, numerically, experimentally. Owing nature problem, our split different scales—from turbine array regional—and we examine each in turn.
Commercial windmill-driven power turbines ("wind turbines") are expanding in popularity and use the commercial industry, since they can generate significant electricity without using fuel or emitting carbon-dioxide ldquogreenhouse gasrdquo. In-country near-off-shore wind becoming more common on European continent. The United States has recently set long-term goals to 10% of national electric renewable sources. In order make such efficient, current 1.5 MW wind-turbine towers rotors very...
Abstract The growing reliance on intermittent sources of renewable energy poses challenges for developing reliable electricity networks. This study has analysed the spatial and temporal characteristics UK's offshore wind production based reanalysis speeds between 2000–2017, considering both 2019 future distribution farm capacity in UK waters. extent frequency low power events are assessed, which shown to vary seasonally. correlation output from pairs reduces with increasing distance them,...
In order to perform fatigue testing on tidal turbine blades, it is necessary apply cyclic loads that do not match the blade's natural frequency. This due high stiffness of blades and thermal challenges associated with composite materials at frequencies typically around 18–20 Hz. To overcome this challenge, auxiliary systems are used load blades. However, conventional hydraulic commonly for purpose known be energy-intensive inefficient. work, we present results obtained FastBlade facility,...
Linear momentum actuator disc theory is extended to address the power available a tidal turbine array spanning cross-section of an open channel flow. A generalised formulation presented, which relaxes constraints in previous models on Froude number flow and geometry array, also considers effects far-wake mixing overall removed from In limiting case no free surface deformation, rigid lid model recovered. Blockage, ratio frontal area cross-sectional surrounding passage, has greatest effect...
Abstract It is well accepted that the wakes created by upstream turbines significantly impact on power production and fatigue loading of downstream this phenomenon affects wind farm performance. Improving understanding wake effects overall efficiency critical for optimisation layout operation increasingly large farms. In present work, NREL 5‐MW reference turbine was simulated using blade element embedded Reynolds‐averaged Navier‐Stokes computations in sheared onset flow at three spatial...
The performance benefits of deploying tidal turbines in close side-by-side proximity to exploit constructive interference effects are demonstrated experimentally using two 1.2 m diameter turbines. arrayed at 1/4 tip-to-tip spacing, and their compared with that a single rotor. Tests were completed the 25 diameter, 2 deep wave current FloWave Ocean Energy Research facility. A detailed assessment inflow conditions different control points is used understand impact rotors, designed for high...
Abstract This paper presents a numerical study of the effects blade roughness on wind turbine performance and annual energy production how these may be partially mitigated through improved control. Three rotors are designed using NACA4415, S801 S810 airfoils, element momentum theory is used to model behaviour. The aerodynamic lift drag data for clean roughened airfoils taken from previous experimental work. These show that surface leads decreased airfoil coefficient an increased across angle...
Due to the growing proportion of wind energy in Great Britain's mix, prolonged periods low power generation have become a significant challenge for decarbonising electricity system. As such, characterising drought severity and duration is important ensuring reliability Employing concepts derived from hydrology, an extreme value analysis was carried out on events Britain based 72 years ERA5 reanalysis data. The application pooling procedures found be beneficial robustly identifying droughts...
Commercially available wind yield assessment models rely on superposition of wakes calculated for isolated single turbines. These methods wake simulation fail to account emergent flow physics that may affect the behaviour multiple turbines and their therefore farm predictions. In this paper wake-wake interaction is modelled computationally (CFD) physically (in a hydraulic flume) investigate physical causes discrepancies between analytical modelling simulations or measurements. Three effects,...
Fatigue testing of tidal turbine blades requires the application cyclic loads without ability to match natural frequency blade due their high stiffness and associated thermal issues composite materials at those frequencies (i.e., 18-20 Hz). To solve this, loading with an auxiliary system is necessary; in most cases, a conventional hydraulic tends be highly energy-demanding inefficient. A regenerative digital displacement pump was employed FastBlade fatigue facility, which saved up 75%...
ABSTRACT The actuator line method (ALM) is a widely used tool for the modelling of horizontal axis turbines and wind tidal farm flows. uses virtual blade representation to simulate dynamics without computational expense associated with resolving geometry. Within ALM, flow first sampled at each section, allowing calculation sectional lift drag forces that are in turn imposed on domain using smearing kernel. In this work, effect sampling robustness ALM discussed. Implementations two types...
Abstract The current work presents the analysis of six different blockage correction methods for axial-flow turbines from literature and compares them to a method proposed by authors using blade-resolved CFD simulations. is performed comparing corrected blocked-flow thrust power results tidal turbine quasi free-flow condition, obtaining quantitative measure error every at blockages tip-speed ratios. This study shows that not available remains valid range thrusts may occur in blocked flows....