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Characteristics of the pulsating jet flow through a dynamic glottal model with a lens-like constriction

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Abstract

A computational study of the pulsating jet in a squared channel with a dynamic glottal-shaped constriction is presented. It follows the model experiments of Triep and Brücker (J Acoust Soc Am 127(2):1537–1547, 2010) with the cam-driven model that replicates the dynamic glottal motion in the process of human phonation. The boundary conditions are mapped from the model experiment onto the computational model and the three dimensional time resolved velocity and pressure fields are numerically calculated. This study aims to provide more details of flow separation and pressure distribution in the glottal gap and in the supraglottal flow field. Within the glottal gap a ‘vena contracta’ effect is generated in the mid-sagittal plane. The flow separation in the mid-coronal plane is therefore delayed to larger diffuser angles which leads to an ‘axis-switching’ effect from mid-sagittal to mid-coronal plane. The location of flow separation in mid-sagittal cross section moves up- and downwards along the vocal folds surface in streamwise direction. The generated jet shear layer forms a chain of coherent vortex structures within each glottal cycle. These vortices cause characteristic velocity and pressure fluctuations in the supraglottal region, that are in the range of 10–30 times of the fundamental frequency.

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Acknowledgements

Part of the work has been funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the research group FOR-894 under Grant No. BR 1494/13-1 which is gratefully acknowledged. Funding of the position of Professor Christoph Bruecker as the BAE SYSTEMS Sir Richard Olver Chair in Aeronautical Engineering is gratefully acknowledged herein.

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Authors and Affiliations

  1. Division of Phoniatrics and Audiology, Department of Otorhinolaryngology, Faculty of Medicine “Carl Gustav Carus”, Technische Universität Dresden, Dresden, Germany

    Willy Mattheus

  2. Department of Mechanical Engineering and Aeronautics, City University London, Northampton Square, London, UK

    Christoph Brücker

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  1. Willy Mattheus
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  2. Christoph Brücker
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Correspondence to Willy Mattheus.

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Mattheus, W., Brücker, C. Characteristics of the pulsating jet flow through a dynamic glottal model with a lens-like constriction. Biomed. Eng. Lett. 8, 309–320 (2018). https://doi.org/10.1007/s13534-018-0075-2

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  • DOI: https://doi.org/10.1007/s13534-018-0075-2

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