A5045170105- Wave and Wind Energy Systems
- Fluid Dynamics and Vibration Analysis
- Ocean Waves and Remote Sensing
- Coastal and Marine Dynamics
- Tropical and Extratropical Cyclones Research
- Combustion and flame dynamics
- Ship Hydrodynamics and Maneuverability
- Advanced Combustion Engine Technologies
- Fluid Dynamics Simulations and Interactions
- Wind Energy Research and Development
- Underwater Vehicles and Communication Systems
- Fire dynamics and safety research
- Radiative Heat Transfer Studies
- Electron and X-Ray Spectroscopy Techniques
- Pesticide Residue Analysis and Safety
- Air Quality and Health Impacts
- Climate Change and Health Impacts
- Mathematical Control Systems and Analysis
- Mass Spectrometry Techniques and Applications
- Maritime Navigation and Safety
- Particle Accelerators and Free-Electron Lasers
- Material Properties and Processing
- Structural Analysis and Optimization
- Oceanographic and Atmospheric Processes
- Water-Energy-Food Nexus Studies
Technical University of Denmark
2012-2024
California Maritime Academy
2010-2021
University of Cambridge
2006-2013
Bridge University
2008
Wellcome Trust
2006
Defence Science and Technology Laboratory
1986
The International Energy Agency Technology Collaboration Programme for Ocean Systems (OES) initiated the OES Wave Conversion Modelling Task, which focused on verification and validation of numerical models simulating wave energy converters (WECs). long-term goal is to assess accuracy establish confidence in use used design as well power performance assessment WECs. To this confidence, authors different existing computational modelling tools simulate given tasks identify uncertainties related...
This work evaluates the hydrodynamic performance of an oscillating water column wave energy converter, with a focus on comparing conventional two-way capture to one-way where only up- or down-stroke is used drive turbine. Small-scale model test experiments are performed, and numerical calculations made using weakly-nonlinear potential flow theory. The air turbine represented experimentally by orifice plate area equal about 1% internal-chamber water-plane area. One-way experimental realized...
Abstract This paper reports on a benchmark study based small-scale (1:50) measurements of single, oscillating water column chamber mounted sideways in long flume. The geometry the OWC is extracted from barge-like, attenuator-type floating concept “KNSwing” with 40 chambers targeted for deployment Danish part North Sea. In addition to traditional two-way energy extraction we also consider one-way passive venting and compare response, pressures total absorbed between two methods. A blind was...
High-altitude relight inside a lean-direct-injection gas-turbine combustor is investigated experimentally by highspeed imaging. Realistic operating conditions are simulated in ground-based test facility, with two being studied: one and outside the ignition loop. The motion of hot gases during early stages recorded using high-speed camera. An algorithm developed to track flame movement breakup, revealing important characteristics development process, including stabilization timescales,...
This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program Ocean Systems. Initial results point absorbers were presented in previous work, and here we present a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative full-scale installation water depth 12.8 m. power-extracting air turbine modeled...
Highly accurate and precise heave decay tests on a sphere with diameter of 300 mm were completed in meticulously designed test setup the wave basin Ocean Coastal Engineering Laboratory at Aalborg University, Denmark. The dedicated to providing rigorous benchmark dataset for numerical model validation. was ballasted half submergence, thereby floating waterline equator when rest calm water. Heave conducted, wherein held stationary dropped from three drop heights: small height, which can be...
High-altitude relight inside a lean, direct-injection, gas turbine combustor is investigated experimentally by high-speed imaging. Ignition testing conducted at two operating conditions: ‘safe’ point which possible, and an ‘unsafe’ condition where ignition precluded the large air mass flow rate. Image processing software has been developed to analyze motion breakup of imaged flame. At safe condition, developing flame kernels are typically swept downstream towards fuel-injector center-line,...
This experimental study investigates the influence of fuel distribution on ignition outcome during high-altitude relight a gas turbine. Planar laser-induced fluorescence is used to image inside lean direct-injection combustor under realistic conditions. A novel apparatus developed permit planar imaging, in which large quantities poorly atomized impinges internal surfaces combustor. Results reveal high variability atomization quality. In absence flame, small droplets are confined areas...
Abstract In this paper, a coupled numerical model in the time domain has been developed to study interaction between interior liquid sloshing and motion of cylindrical closed fish cage when is exposed regular waves. The single-dominant nonlinear multimodal theory for presented [1] was implemented simulate responses cage. A time-domain simulator based on Cummins formulation equations [2] used solve motion, while WAMIT provide all required frequency-domain hydrodynamic coefficients external...
Abstract Rotary airborne wind energy (AWE) systems are a family of AWE devices that utilise networked kites to form rotors. One such device is the Daisy Kite developed by Windswept and Interesting. The uses novel tensile rotary power transmission (TRPT) transfer generated at flying rotor down ground. Two dynamic models have been compared; one with simple spring-disc representation, multi-spring representation can take account more degrees freedom. Simulation results show angular velocity...
A finite-difference based approach to wave-structure interaction is reported that employs the overset grid generation. two-dimensional code utilizes Overture C++ library has been developed solve linear radiation problem for a floating body of arbitrary form. This software implementation validated by performing time-domain simulations evaluate dynamic forces applied half-submerged cylinder and rectangular barge in response prescribed motion. Gaussian displacement used introduce range wave...
<title>Abstract</title> This paper reports on a new milestone under the "OES Task 10Numerical modelling and verification", established to provide numerical modeling guidelines for wave energy converters. The task has been initiated by International Energy Agency Technology Collaboration Programme Ocean Systems (OES). study complements studies presented in Bingham et al (2021) Wendt (2019). Here we focus small-scale (1:50) measurements of single, Oscillating Water Column chamber mounted...
A fast-response flame ionization detector (FFID) has been used to study isothermal gas transport and mixing inside a turbine combustion chamber. The large, highly linear dynamic range of the FFID coupled with frequency response that extends up approximately 200 Hz can reveal large-scale features interest in turbulent flows. Experiments were performed ground-based test facility simulating high-altitude restart conditions. Pulses propane discharged into core swirler fuel injector through...