You are now viewing content in Tethys Engineering through the integrated PRIMRE search. Clicking on titles will take you to the content on the integrated database. Partial word matches are returned (e.g. "test" finds "testing"), but every entered term must be found. If you don't find any results, try reducing the number of words entered. Filters to the right can help narrow your search.
Showing Results for
- Kumar and Saini
Energy crisis and high emission of fossil fuels are major driving forces for developing renewable energy based technologies. In order to meet growing demand for energy, hydropower can be one of the sustainable alternatives. Further, thehydrokineticturbineis considered as one of the most emerging technologies which harness energy from flowing water. In this paper, an attempt has been made to…
- Goldschmidt et al.
A marine hydrokinetic (MHK) cycloturbine is a renewable electric power generation system used in rivers or tidal environments to address the need for electricity in remote regions. MHK cycloturbines have hydrofoils oriented perpendicular to the flow in a paddlewheel configuration, and use lift generated from these foils to produce power. Due to the high cost associated with its operation and…
- Li et al.
The modeling and control of tethered undersea kites for power generation are discussed in this paper. In the first part, we apply the added mass model to underwater kite systems. In the second part, the stability of undersea kite systems is analyzed using two frameworks. The dissipative property of thehydrodynamic forceis provided first. Based on this property, the input to state stability of…
- Cronin et al.
Ocean Renewable Power Company, Inc. (ORPC) recently completed an EU Horizon 2020 funded project to develop and test a “wet-gap” generator for use with their tidal and river energy converters. This wet-gap system is designed for a normal operating condition of a seawater flooded electrical generator which would typically be air or oil filled. This development removes the need for insulating oil…
- Gunawan et al.
Although hydrokinetic turbines offer many benefits their installation and operation also present challenges. Similar to other riverine structures, a key issue facing the hydrokinetic structures is the trapping of sediment and debris (organic and non-organic). This issue impacts the financial feasibility of projects as well as posing environmental concerns. The trapping of sediment and debris…
- Loeffler et al.
The BladeRunner Energy hydrokinetic turbine A kw-scale prototype of the BladeRunner system was tested at the Tanana River Test Site in Nenana, AK in the fall of 2021 and the summer of 2022. The BladeRunner hydrokinetic turbine uses a flexible torsional cable to connect a submerged trailing rotor to a floating generator housing that is supported by a single mooring line. The BladeRunner design…
- Polagye et al.
When the swept area of an array of current turbines occupies a substantial fraction of a channel’s cross-section, their unit performance is augmented. In moderate confinement, power coefficients for individual turbines may exceed the Betz-Lanchester-Zhukowsky limit, and, in practice, exceed unity by drawing on both kinetic and potential energy embodied in the flow. This effect has long been…
- Shamsuddin et al.
Savoniusturbinesare practical for rivers with low speeds due to their simple design and good self-starting capabilities. Despite these advantages, real implementation is still limited due to their low power efficiency. However, the experimental studies are scarce as they mainly focus on power performance, neglecting the impact of materials exposed to the wind or water medium. Therefore, the…
- Shashikumar and Madav
In the present paper, three-dimensional numerical simulations were carried out to examine the influence of the overlap ratio between the two straight edges on the advancing and returning blades of the novel V-shapedrotor bladeprofiles using thesliding meshtechnique. The performance parameters were computed with respect to the tip speed ratio. The findings show that the coefficient of torque…
- Reed et al.
This paper examines the control of an autonomous underwater vehicle (AUV) with a deployable energy-harvesting kite for oceanographic observation and surveillance. The proposed design and control strategies specifically address objectives of achieving high-payload, long-endurance AUV operation through the deployment of an energy-harvesting kite while the AUV is anchored to the seabed, followed…
- Mademlis et al.
The tethered-undersea-kite (TUSK) represents a new electric power generation concept for harvesting energy from tidal currents, with higher power density compared to traditional static tidal turbines. However, the power and rotating speed of the turbine fluctuate periodically depending on the kite's motion in the sea creating an additional challenge for the speed control of the generator…
- Mademlis et al.
Tethered-UnderSea-Kites (TUSK) represent a new electric power generation concept for harvesting the energy of the tidal current. A TUSK system has the advantage of increasing the extracted power from the tidal flow compared to a traditional static tidal turbine of the same size. This paper deals with the modeling and control of a TUSK tidal generator in order to estimate the energy production…
- Siddiqui et al.
This paper presents a study wherein we experimentally characterize the dynamics and control system of a lab-scale ocean kite, and then refine, validate, and extrapolate this model for use in a full-scale system. Ocean kite systems, which harvest tidal and ocean current resources through high-efficiency cross-current motion, enable energy extraction with an order of magnitude less material (and…
- Küppers et al.
The supply of energy is sustainable only if it is predominantly based on renewable or regenerative energies. For this reason, the use of micro-hydropower plants on rivers and streams is considered recently. This is a particular challenge for the preservation of ecologically permeable streams, so that no dams or similar structures can be considered. While the axial turbine design has prevailed…
- Salomonsson et al.
The Powerkite project is developing a power take-off system (PTO) for a novel tidal energy converter by Swedish developer Minesto known as Deep Green. One of the key deliverables of the project was to develop a conceptual design of the complete offshore array system including substations, cables and grid connection, with the aim to assess the key parameters of the future tidal plant (…
- Aguilera et al.
The current study presents flow measurements around a hydrokinetic turbine using a Horizontal Acoustic Doppler Current Profiler (HADCP). HADCPs are often used to estimate the water discharge rate and flow velocity however, they can also be used to characterize the near-surface flows; this includes the wake generated by a surface mounted hydrokinetic turbine. Tests are conducted around a 22-kW…
- Cornett et al.
The potential for dangerous interactions with floating debris is a leading consideration when evaluating potential sites for deployment of hydrokinetic power systems, yet to date, relatively little research effort has been directed towards developing and proving effective devices and systems for protecting turbines from floating debris.
This paper presents and discusses results from a…
- Beknalkar et al.
A marine hydrokinetic (MHK) kite offers an economical solution to the challenges of size and investment costs posed by the existing class of energy converters used to harvest tidal and ocean current energy. MHK kite systems are complicated devices that harvest ocean current energy by flying a tethered kite perpendicular to the motion of the current flow. They possess strong coupling between…
- Naik et al.
This paper presents the formulation and results for a control-aware optimization of the combined geometric and structural design of an energy-harvesting underwater kite. Because kite-based energy-harvesting systems, both airborne and underwater, possess strong coupling between closed-loop flight control, geometric design, and structural design, consideration of all three facets of the design…
- He et al.
Passive turbulence control of flow induced motion of a cylinder using strips has been practiced for over 30 years. The two distinct physical characteristics of strips: thickness and roughness, can have coupled effects on altering the flow induced motion. The experimental work discussed here decouples these two effects for augmented energy extraction. Tests with cylinders attached with strips…
Displaying 1 - 20 of 72