Limitations of fixed pitch Darrieus hydrokinetic turbines and the challenge of variable pitch

Kirke, Brian; Lazauskas, L.

doi:10.1016/j.renene.2010.08.027

Cited by 110 publications

(34 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Increased of rotation at the same flow rate using passive variable-pitch have a larger trend when compared with the fixed-pitch. This is consistent with many researchers finding that start of rotating capabilities is one disadvantages of vertical axis turbine types [2,11]. According to rotation produced in Table 1, TSR values is determined and shown in Table 2.…”

Section: Vertical-axis Turbine Testsupporting

confidence: 87%

An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine

Hantoro¹,

Utama²,

Erwandi³

et al. 2011

itbj.eng.sci.

View full text Add to dashboard Cite

Abstract. Vertical-axis hydrokinetic turbines with fixed pitch blades typically suffer from poor starting torque, low efficiency and shaking due to large fluctuations in both radial and tangential force with azimuth angle. Maximizing the turbine power output can be achieved only if the mechanism of generation of the hydrodynamic force on the blades is clearly identified and tools to design high-performance rotors are developed. This paper describes an initial experimental investigation to understand more of the performance on vertical-axis turbine related to the effect of fixed-pitch and passive variable-pitch application using airfoil NACA 0018. Comparative analysis according to aspects of rotation and tip speed ratios was discussed. Information regarding the changes of foil position in passive variable-pitch during rotation at a limited range of flow velocity variations test was obtained and analyzed.

show abstract

Section: Vertical-axis Turbine Testsupporting

confidence: 87%

An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine

Hantoro¹,

Utama²,

Erwandi³

et al. 2011

itbj.eng.sci.

View full text Add to dashboard Cite

show abstract

“…Although relatively easy and simple to build, one of the drawbacks of this design is that at low speeds, straight blades can suffer wildly varying angle of attack (Kirke and Lazauskas 2011). This makes fixed pitch straight-bladed devices liable to stall, reduces overall device performance, hampers their ability to self-start and imposes additional stresses on the device in the form of rapidly fluctuating torque pulsations.…”

Section: Cross-flow Turbinesmentioning

confidence: 99%

“…In principle, it is possible to minimise these issues through the use of a pitch-control system (Kirke and Lazauskas 2011). Active pitch-control systems, where blade pitch is forced to follow a predetermined regime, are mechanically complex, however, the designs of passive pitch-control systems, where the forces acting on the blades control the pitch, are of dubious effectiveness.…”

Section: Cross-flow Turbinesmentioning

confidence: 99%

“…Active pitch-control systems, where blade pitch is forced to follow a predetermined regime, are mechanically complex, however, the designs of passive pitch-control systems, where the forces acting on the blades control the pitch, are of dubious effectiveness. As a result of these problems, variablepitch Darrieus wind turbines have never reached commercial production (Kirke and Lazauskas 2011). Still, it does appear possible to make efficient hydrokinetic Darrieus rotors, as demonstrated by Kyozuka (2008), although it should be noted that the Reynolds number and blockage ratio that this design was tested do not appear to be defined.…”

Section: Cross-flow Turbinesmentioning

confidence: 99%

See 1 more Smart Citation

Current tidal power technologies and their suitability for applications in coastal and marine areas

Roberts

Thomas

Sewell

et al. 2016

J. Ocean Eng. Mar. Energy

118

View full text Add to dashboard Cite

A considerable body of research is currently being performed to quantify available tidal energy resources and to develop efficient devices with which to harness them. This work is naturally focussed on maximising power generation from the most promising sites, and a review of the literature suggests that the potential for smaller scale, local tidal power generation from shallow near-shore sites has not yet been investigated. If such generation is feasible, it could have the potential to provide sustainable electricity for coastal homes and communities as part of a distributed generation strategy, and would benefit from easier installation and maintenance, lower cabling and infrastructure requirements and reduced capital costs when compared with larger scale projects. This article reviews tidal barrages and lagoons, tidal turbines, oscillating hydrofoils and tidal kites to assess their suitability for smaller scale electricity generation in the shallower waters of coastal areas at the design stage. This is achieved by discussing the power density, scalability, durability, maintainability, economic potential and environmental impacts of each concept. The discussion suggests that tidal kites and range devices are not well suited toward small-scale shallow water applications due to depth and size requirements, respectively. Cross-flow turbines appear to be the most suitable technology, as they have high power densities and a maximum size that is not constrained by water depth. Oscillating hydrofoils would also be appropriate, provided comparable levels of efficiency can be achieved.

show abstract

“…VAWTs are usually stall regulated due to the complexities with pitch regulation [9,10]. Therefore, the effect of dynamic stall is very important for the operation of VAWTs.…”

Section: Introductionmentioning

confidence: 99%

Simulating Dynamic Stall Effects for Vertical Axis Wind Turbines Applying a Double Multiple Streamtube Model

Dyachuk

Goude

2015

Energies

View full text Add to dashboard Cite

Abstract:The complex unsteady aerodynamics of vertical axis wind turbines (VAWT) poses significant challenges to the simulation tools. Dynamic stall is one of the phenomena associated with the unsteady conditions for VAWTs, and it is in the focus of the study. Two dynamic stall models are compared: the widely-used Gormont model and a Leishman-Beddoes-type model. The models are included in a double multiple streamtube model. The effects of flow curvature and flow expansion are also considered. The model results are assessed against the measured data on a Darrieus turbine with curved blades. To study the dynamic stall effects, the comparison of force coefficients between the simulations and experiments is done at low tip speed ratios. Simulations show that the Leishman-Beddoes model outperforms the Gormont model for all tested conditions.

show abstract

Limitations of fixed pitch Darrieus hydrokinetic turbines and the challenge of variable pitch

Cited by 110 publications

References 4 publications

An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine

An Experimental Investigation of Passive Variable-Pitch Vertical-Axis Ocean Current Turbine

Current tidal power technologies and their suitability for applications in coastal and marine areas

Simulating Dynamic Stall Effects for Vertical Axis Wind Turbines Applying a Double Multiple Streamtube Model

Contact Info

Product

Resources

About