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Phd Trailing Edge Noise Reduction for Airfoils at High Lift Conditions

Delft University of Technology is pleased to invite applicants to apply for a new opening PhD position in mechanical engineering. This position is available for 3 years. This position is open until filled.

The faculty of Aerospace Engineering at Delft University of Technology is one of the world’s largest faculties devoted entirely to aerospace engineering. In the Netherlands it is the only research and education institute directly related to the aerospace engineering sector. It covers the whole spectrum of aerospace engineering subjects. In aeronautics, the faculty covers subjects ranging from aerodynamics and flight propulsion to structures and materials and from control and simulation to air transport and operations. In astronautics, topics include astrodynamics, space missions and space systems engineering. The faculty has around 2,700 BSc and MSc students, 225 PhD candidates and 27 professors supported by scientific staff.

The faculty’s mission is to be the best Aerospace Engineering faculty in the world, inspiring and educating students through modern education techniques and enabling staff to perform ambitious research of the highest quality for the future of aerospace. The working atmosphere at the faculty is friendly, open-minded and dedicated.

The Department of Aerodynamics, Wind Energy and Flight Performance and Propulsion (AWEP) is one of four departments composing Aerospace Engineering. Fundamental research is performed in the Aerodynamics section. Aircraft design, propulsion systems and their integration are the main topics in the FPP section. Wind energy systems, from small wind turbines to large offshore farms, are the objective of the research of the Wind Energy Section. The department operates comprehensive laboratories, equipped with modern wind tunnels and state-of-the-art measurement systems.

The section Wind Energy is part of the Aerodynamics, Wind Energy and Flight Performance and Propulsion (AWEP) Department in the Faculty of Aerospace Engineering. The Wind Energy section facilitates the development of wind energy technology and the expansion of the use of wind power through research and education. In its research activities there is a focus on large, multimegawatt offshore wind turbines and offshore wind farms, though urban wind power is also addressed. Both technology development aspects as well as fundamental aspects are present in the research programme. With respect to education, dedicated courses at the BSc and MSc levels are offered for Aerospace students, SET students and for the European Wind Energy Master (EWEM) students.

Broadband trailing edge noise generated by the scattering of the turbulent flow convecting over the trailing edge of an airfoil is one of the most relevant sources of nuisance in wind turbine applications. Many passive mitigation strategies have been proposed to reduce this source of noise. Acoustic measurements carried out both in wind tunnels and in field, reported that saw tooth trailing edge serrations offer a relatively good noise reduction per simplicity of design. Despite the promising results, the achieved noise reduction is far below the predicted values, especially when the airfoil is operated under positive angle of attack. More recently, it was demonstrated that trailing edge noise can be even further reduced, once introducing flow streamline information in the design.

The project aims at the study trailing edge noise reduction mechanisms, with special focus on trailing edge add ons devices in cambered airfoils operating under realistic conditions: Re>106, high lift. The candidate will focus on the development of improved trailing edge noise reduction concepts by means of experimental data and numerical simulations.

2. Develop improved trailing edge noise reduction concepts based on experimental and numerical understanding of mechanisms for realistic conditions: high Re and high lift conditions. A "numerical optimization method" will be developed which, starting from an initial geometry, uses numerical simulations to generate a modified geometric shape.

3. Validate the obtained results with experimental analysis techniques: wind tunnel PIV, noise (beamforming), forces, pressure distribution, and complement the experimental work with computational aeroacoustic analysis

The present project will be carried out in collaboration between Siemens Wind Power (Denmark) and TU Delft. Parts of the work need to be treated confidentially.

The PhD position is granted by the Marie Skodowska Curie ETN Smart Answer project. Mobility requirements apply to this position. Researchers can be of any nationality. They are required to undertake trans national mobility (i.e. move from one country to another) when taking up their appointment. The location of the researcher's residence or main activities during the 3 years prior to their recruitment is determining. The PhD candidate is going to be hired by Siemens Denmark (in the 3rd year), therefore the candidate is eligible to be recruited if he/she has resided or carried out his/her main activity outside of Denmark for more than 24 months in the 3 years immediately prior to their recruitment.

The candidate should have an MSc degree in an area relevant to the subject, e.g. aerospace engineering, (applied) physics, applied mathematics, electrical engineering, materials or mechanical engineering. A combination of good mathematical/analytical skills and a strong interest in performing experiments is required. A solid knowledge of signal processing and advanced programming skills are advantageous for this position.

TU Delft offers a customisable compensation package, a discount for health insurance and sport memberships, and a monthly work costs contribution. Flexible work schedules can be arranged. An International Children's Centre offers childcare and an international primary school. Dual Career Services offers support to accompanying partners. Salary and benefits are in accordance with the Collective Labour Agreement for Dutch Universities.

As a PhD candidate you will be enrolled in the TU Delft Graduate School. TU Delft Graduate School provides an inspiring research environment; an excellent team of supervisors, academic staff and a mentor; and a Doctoral Education Programme aimed at developing your transferable, discipline-related and research skills. Please visit www.tudelft.nl/phd for more information.

For information about this vacancy, you can contact Dr.ir. D. Ragni, Assistant professor, e-mail d.ragni@tudelft.nl, tel: +31 15 2782053. To apply, please e-mail a detailed CV and 3 references along with a letter of application. Please send your application by1 ofnovember2018 to Sylvia Willems, Secretary email: S.M.Willems@tudelft.nl. When applying, please refer to vacancy number LR18-30.


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