Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Johannes N. Braukmann"'
Abstract An investigation into blade tip vortices of a sub-scale rotor under cyclic pitch conditions is carried out. Background oriented schlieren (BOS), particle image velocimetry (PIV), and computational fluid dynamics (CFD) are applied to the same
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37defc51fcc5c2641ebba31ec8dc48ea
https://elib.dlr.de/141955/
https://elib.dlr.de/141955/
Publikováno v:
Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9783030795603
The present work discusses a methodology to reconstruct three-dimensional positions of rotor blade tip vortices based on stereoscopic background-oriented schlieren data. The reconstruction procedure is first applied on a rotor test stand where a comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bc373ab4172a51d87a9ae8b3bd688ee
https://doi.org/10.1007/978-3-030-79561-0_30
https://doi.org/10.1007/978-3-030-79561-0_30
To characterize the vortex system of a helicopter rotor with cyclic pitch, an experimental investigation is carried out at the rotor test facility of the DLR, German Aerospace Center in Gottingen. ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1b095987a13359dfe557a18852b23fe
https://elib.dlr.de/135809/
https://elib.dlr.de/135809/
Autor:
C. Christian Wolf, Johannes N. Braukmann, Armin Weiss, Markus Raffel, Kurt Kaufmann, James T. Heineck
Publikováno v:
Experiments in Fluids. 61
In the published version, graphical abstract was missing. It is given below.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9cba6764d6f58abfe690a015d2da1a40
https://doi.org/10.1007/s00348-020-02955-1
https://doi.org/10.1007/s00348-020-02955-1
Publikováno v:
Experiments in Fluids. 61
Abstract A method of measuring density second derivative (shadowgraph) as a variant of background oriented schlieren (BOS) is presented. Pairs of images of a moving background with a small time difference are analysed using moving-window cross-correl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bab9a49127102f4e3f08f76156a1b7b6
https://doi.org/10.1007/s00348-019-2865-4
https://doi.org/10.1007/s00348-019-2865-4
Autor:
Armin Weiss, Christoph B. Merz, Till Schwermer, Anthony Donald Gardner, C. Christian Wolf, Markus Raffel, Johannes N. Braukmann
Publikováno v:
AIAA Journal. 55:1753-1756
RAFFEL and Merz [1] demonstrated the feasibility of unsteady boundary-layer transition detection by differential infrared thermography (DIT), a method whereby the difference of two sequentially recorded infrared images is analyzed to extract the poin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67899acc5563635327e0653b5dc88b1d
https://doi.org/10.2514/1.j055452
https://doi.org/10.2514/1.j055452
Autor:
Armin Weiss, Johannes N. Braukmann, Markus Raffel, C. Christian Wolf, James T. Heineck, Kurt Kaufmann
The presented work tackles the lack of experimental investigations of unsteady laminar-turbulent boundary-layer transition on rotor blades at cyclic pitch actuation, which are important for accurate performance predictions of helicopters in forward f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::099a7bc1b5a99f1328f79068d5601cee
https://elib.dlr.de/126548/
https://elib.dlr.de/126548/
Publikováno v:
AIAA Scitech 2019 Forum.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f78513f4054b6592b03d8120f16fa354
https://doi.org/10.2514/6.2019-2325
https://doi.org/10.2514/6.2019-2325
The tip vortex system downstream of a four-bladed instrumented rotor was investigated experimentally through the application of stereoscopic particle image velocimetry (PIV). A dynamic stall test case was facilitated by a high cyclic pitch setting of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26f2693af1302f7b2e7ae7b35422bbe6
https://elib.dlr.de/127163/
https://elib.dlr.de/127163/
Autor:
Till Schwermer, Andreas Goerttler, Markus Raffel, Johannes N. Braukmann, Anthony Donald Gardner
Publikováno v:
Scopus-Elsevier
The blade-tip vortex of a rotating and pitching DSA-9A blade was investigated numerically and experimentally. Numerical computations were performed using DLR, German Aerospace Center’s finite volum...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7f803491542834273f0a52b08c3cfa4
https://doi.org/10.2514/1.c034693
https://doi.org/10.2514/1.c034693