Objective
The project will test several shapes of tip using a 16 m diameter horizontal axis test wind turbine.
Results from the simulation experiments confirmed theoretical estimates that the maximum noise reduction from tip modifications was limited to 5 dB -- an important noise threshold. However, experimental investigation of the nine blade tips led to an unexpected result. The noise level of the reference blade tip was 2-3 dB smaller than the dedicated designs of blade tip. Bevelling the trailing edge gave an additional overall noise reduction of nearly 1 dB, with a reduction of 1-5 dB in the frequency range 2-5 kHz. These results were also confirmed by non-rotating wind tunnel experiments. The results from this project are extremely important for they show that it is not only theoretically possible to reduce noise by 3 dB with proper blade tip design, but that it is likely that under current regulations it is feasible to install twice the wind turbine capacity on the same land area.
Medium- and large-scale wind turbines can be built more economically if it is possible to realize a lightweight design for each component. Weight reduction, however, mostly entails higher tip speeds of the blades what goes hand in hand with a higher level of aerodynamically generated noise. Bearing the acceptance of wind turbines by the public in mind, it is mandatory to avoid noise as far as possible. Whereas the structural noise generated by components like gear-boxes, generators etc... can be reduced by well known standard procedures, the aerodynamic noise, especially the one emanating from the blade tip region, has to undergo further investigation. In Europe several countries are adressing this problem so that it makes sense to undertake a joint effort, in order to avoid duplicated research. The results expected from this experimental approach should be the quantification of the tip noise as compared to other noise sources, the influence of different tip shapes on this noise and proposals for 'quiet' tips with good performance characteristics and proposals for further investigations with respect to the numerical simulation of the problem.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology mechanical engineering vehicle engineering aerospace engineering aircraft
- engineering and technology environmental engineering energy and fuels renewable energy wind energy
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
70569 STUTTGART
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.