Analysing and Optimizing the Aerodynamic Performance of Wind Turbine Blades Using Injected-Air Jets at Variable Frequency and Amplitude for Flow Control

Hong, Liu; Fupeng, Huo; Chen, Zuoyi

doi:10.1260/030952405774857860

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Another flow-control technique employs an alternating jet (blowing/sucking) to obtain a zero, mean air-mass transfer over each sinusoidal oscillatory period. The flowcontrol effectiveness was reported to be dependent on the oscillatory-jet momentum, frequency, and incident angle [271], and it demonstrated lift-coefficient enhancement of up to 20% in the blade stall region [271].…”

Section: Blowing-suction Controlmentioning

confidence: 99%

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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It is projected that, in the following years, the wind‐energy industry will maintain its rapid growth over the last few decades. Such growth in the industry has been accompanied by the desirability and demand for larger wind turbines aimed at harnessing more power. However, the fact that massive turbine blades inherently experience increased fatigue and ultimate loads is no secret, which compromise their structural lifecycle. Accordingly, this demands higher overhaul‐and‐maintenance (O&M) costs, leading to higher cost of energy (COE). Introduction of flow‐control devices on the wind turbine is a plausible solution to this issue. Flow‐control mechanisms feature the ability to effectively enhance/suppress turbulence, advance/delay flow transition, and prevent/promote separation, leading to enhancement in aerodynamic and aeroacoustics performance, load alleviation and fluctuation suppression, and eventually wind turbine power augmentation. These flow‐control devices are operated primarily under two schemes: passive and active control. Development and optimization of flow‐control devices present the potential for reduction in the COE, which is a major challenge against traditional power sources. This review performs a comprehensive and up‐to‐date literature survey of selected flow‐control devices, from their time of development up to the present. It contains a discussion on the current prospects and challenges faced by these devices, along with a comparative analysis centered on their aerodynamic controllability. General considerations and conclusive remarks are presented after the discussion.

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Section: Blowing-suction Controlmentioning

confidence: 99%

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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“…Manual iterations for designs that encompass less understood physical phenomena sometimes use experimentation in the design loop, and this is particularly observed for boundary layer control devices, 36 blades and scour protection. Evidently, experiments are also observed for other technology developments, but often not as a step in design iterations.…”

Section: Design With a Narrow Scopementioning

confidence: 99%

Review of knowledge development for the design of offshore wind energy technology

Zaaijer

2009

Wind Energy

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Offshore wind energy (OWE) is one of the emerging sustainable energy sources that are currently developed under public support. In the long run, it needs to become competitive in the energy market under the same conditions as regular sources, and it is expected that engineering design can contribute significantly towards this goal. Various activities, both academic and industrial, have contributed to the knowledge base that is needed for design and technology development and the paper reviews this knowledge. The objectives of the paper are to identify points of attention for future research and to suggest directions where academic research can contribute to design improvements. The review and the suggestions do not address very specific areas of the broad range of knowledge, but rather characterizes the types of knowledge that are available and which are missing. Many research activities contribute to foundational knowledge, needed to perform simulation and analysis of provisional design solutions. Most of the design-related studies reviewed for this paper are solution oriented and contribute to contextualized knowledge. Studies that put more emphasis on methodologies largely target optimization methods. Existing knowledge appears to be weak in methodological support of the integration of the various asynchronous design processes that contribute to OWE development. The paper leads to a plea to generate such knowledge, which can be transferred from academia to industry to enhance the design strength already present in the industry. Several points of attention are given for this type of research.Offshore wind energy (OWE) is one of the emerging sustainable energy sources. Starting with the fi rst offshore wind turbine in 1990, cumulative installed power has reached nearly 1500 MW in early 2009, mainly in the waters surrounding North-West Europe. Currently, government incentives are essential to the development of offshore wind farms, but in the long run, OWE will need to become competitive in the energy market under the same conditions as regular sources. Various activities, both academic and industrial, have contributed to the knowledge base that is needed to achieve the desired performance of offshore wind farms in terms of, for instance, cost, power quality, security of supply and environmental impact. This paper reviews the types of contextualized knowledge about rotor-nacelle assemblies in the academic literature, this is one of the prominent interests in specialist literature. [19][20][21] Case studies of offshore wind farm design usually cover all aspects of design, starting with an overview of the requirements and ending with a comparison of various design options, such as in Reference 22. These studies generated knowledge about various conceptual solutions in addition to the case studies of components, sub-systems and procedures discussed above, but they also contributed to providing references for typical environmental conditions, overall requirements and expectations for system properties. They helped id...

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Analysing and Optimizing the Aerodynamic Performance of Wind Turbine Blades Using Injected-Air Jets at Variable Frequency and Amplitude for Flow Control

Cited by 2 publications

References 13 publications

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Review of knowledge development for the design of offshore wind energy technology

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