caa a22 4500 606198210 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1942-6 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1942-6 Phase-locked flow field analysis in a synthetic human larynx model [Elektronische Daten] [Alexander Lodermeyer, Stefan Becker, Michael Döllinger, Stefan Kniesburges] The fluid flow within a human larynx plays an essential role in the fluid-structure-acoustic interaction during voice production. This study addresses the flow field downstream of aerodynamically driven, synthetic vocal folds. In order to quantitatively investigate the supraglottal formation of the flow field within one oscillation cycle of the vocal folds, a phase-locked PIV technique is introduced. The pseudo-time-resolved measurement results were averaged for each phase angle. When including a supraglottal channel, the jet was deflected from the centerline of the supraglottal channel and changed the direction of deflection in different cycles. The result is a bistable flow field. Therefore, a sorting method based on the mean cyclic supraglottal pressure difference was introduced. For both states of the flow field, a recirculation area was detected, interacting with the arising glottal jet in every oscillation cycle. This interaction could be identified as the major cause for supraglottal jet deflection, and the sense of rotation of the recirculation area defined the direction of deflection. The asymmetric structure of the flow field was caused by the geometric boundary condition, i.e., due to the present supraglottal channel. An additional key factor was found to be the contact between the two vocal folds in each oscillation cycle which interrupted the jet flow periodically. Removing the supraglottal channel resulted in a symmetric jet location. When avoiding vocal fold contact, the bistable behavior vanished and the jet was steadily deflected to one lateral side. In the present study, it cannot be confirmed that the Coanda effect is responsible for the deflection. Springer-Verlag Berlin Heidelberg, 2015 Lodermeyer Alexander Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Cauerstr. 4, 91058, Erlangen, Germany aut Becker Stefan Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Cauerstr. 4, 91058, Erlangen, Germany aut Döllinger Michael Institute of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Bohlenplatz 21, 91054, Erlangen, Germany aut Kniesburges Stefan Institute of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Bohlenplatz 21, 91054, Erlangen, Germany aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-13 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1942-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1942-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lodermeyer Alexander Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Cauerstr. 4, 91058, Erlangen, Germany aut NATIONALLICENCE 700 1- Becker Stefan Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Cauerstr. 4, 91058, Erlangen, Germany aut NATIONALLICENCE 700 1- Döllinger Michael Institute of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Bohlenplatz 21, 91054, Erlangen, Germany aut NATIONALLICENCE 700 1- Kniesburges Stefan Institute of Phoniatrics and Pediatric Audiology, University Hospital Erlangen, Bohlenplatz 21, 91054, Erlangen, Germany aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-13 0723-4864 56:4<1 2015 56 348