Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Gerd Gülker"'
Autor:
Simon Nietiedt, Tom T. B. Wester, Apostolos Langidis, Lars Kröger, Robin Rofallski, Martina Göring, Martin Kühn, Gerd Gülker, Thomas Luhmann
Publikováno v:
Sensors, Vol 22, Iss 13, p 5014 (2022)
The design of rotor blades is based on information about aerodynamic phenomena. An important one is fluid-structure interaction (FSI) which describes the interaction between a flexible object (rotor blade) and the surrounding fluid (wind). However, t
Externí odkaz:
https://doaj.org/article/ee8152100c4e43c8ad7b75ffbcd1d849
Publikováno v:
Physical Review X, Vol 8, Iss 2, p 021015 (2018)
As a fundamental phenomenon of fluid mechanics, recent studies suggested laminar-turbulent transition belonging to the universality class of directed percolation. Here, the onset of a laminar separation bubble on an airfoil is analyzed in terms of th
Externí odkaz:
https://doaj.org/article/43714ca6ebef462dbcdc6a14cf93f3f7
Transition from laminar to turbulent flow is still a challenging problem. Recent studies indicate a good agreement when describing this phase transition with the directed percolation theory. This study presents a new experimental approach by means of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe11c9ba2ed35a7094c79beef4f02496
https://doi.org/10.21203/rs.3.rs-1152211/v1
https://doi.org/10.21203/rs.3.rs-1152211/v1
Autor:
Robin Rofallski, Martina Goering, Thomas Luhmann, Joachim Peinke, Lars Kröger, Tom T. B. Wester, Apostolos Langidis, S. Nietiedt, Gerd Gülker
Publikováno v:
14th International Symposium on Particle Image Velocimetry. 1
Wind turbines face harsh inflow conditions when operating in the atmospheric boundary layer or in the wake of other wind turbines. The incoming velocity field can change within seconds due to the turbulent structures it contains, resulting in a rapid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ddb92591efc0b7d41d7ec1408921640
https://doi.org/10.18409/ispiv.v1i1.195
https://doi.org/10.18409/ispiv.v1i1.195
Autor:
Tom T. B. Wester, Johannes Krauss, Lars Neuhaus, Agnieszka Hölling, Gerd Gülker, Michael Hölling, Joachim Peinke
Wind turbines operate under constantly changing turbulent inflow conditions. In the rotating system, wind gusts lead to variations in the angle of attack at local blade segments resulting in dynamic effects such as dynamic stall. Such highly non-line
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c6de218d9e10c528ce45a4099389500
http://arxiv.org/abs/2012.10245
http://arxiv.org/abs/2012.10245
Publikováno v:
Springer Proceedings in Physics ISBN: 9783030221959
Two experiments are shown utilizing an active grid in a wind tunnel. The reproducibility of turbulent flow fields is shown by repeating the motion of the active grid shafts. Additionally, a new approach to replicate turbulent flow fields with atmosph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dcfd767725a42e5348119d6c8b2dfa63
https://doi.org/10.1007/978-3-030-22196-6_30
https://doi.org/10.1007/978-3-030-22196-6_30
Autor:
A. Langidis, Ttb Wester, Joachim Peinke, Lars Kröger, Gerd Gülker, M. Göring, M. Hölling, S. Nietiedt, Thomas Luhmann
Publikováno v:
Journal of Physics: Conference Series. 1618:032025
Experimental studies of fluid-structure interaction on a single blade of the model wind turbine MoWiTO 1.8, which has been designed as an aerodynamically downscaled wind tunnel model of the NREL 5 MW turbine, were performed. Tailored inflow generated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5501c5c01c02cb922800019cf2aba5b3
https://doi.org/10.1088/1742-6596/1618/3/032025
https://doi.org/10.1088/1742-6596/1618/3/032025
Autor:
Dominik Traphan, Iván Herráez, Peter Meinlschmidt, Friedrich Schlüter, Joachim Peinke, Gerd Gülker
Publikováno v:
Wind Energy Science, Vol 3, Pp 639-650 (2018)
Wind turbines are constantly exposed to wind gusts, dirt particles, and precipitation. Depending on the site, surface defects on rotor blades emerge from the first day of operation on. While erosion increases quickly with time, even small defects can
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e758c3aba6a0740e16c6fccfbf0dcd5d
http://oops.uni-oldenburg.de/4176/
http://oops.uni-oldenburg.de/4176/
Publikováno v:
Control Engineering Practice, 80
A commonly applied method to reduce the cost of wind energy, is alleviating the periodic loads on turbine blades using Individual Pitch Control (IPC). In this paper, a data-driven IPC methodology called Subspace Predictive Repetitive Control (SPRC) i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0bd20bdf0f536a917b6c50692e5dfe59
http://arxiv.org/abs/1809.04296
http://arxiv.org/abs/1809.04296
Publikováno v:
Springer Proceedings in Physics ISBN: 9783319579337
In this article spatio-temporally resolved particle image velocimetry data of a flat plate’s boundary layer are shown. With this set up, it is possible to capture the highly unsteady phase transition from laminar to turbulent state of the boundary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84200b0bddea96eca914d143da78d744
https://doi.org/10.1007/978-3-319-57934-4_2
https://doi.org/10.1007/978-3-319-57934-4_2