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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v28.i1-2.90
pages 116-134

On Physical Modeling of Noises Generated by Airflow in the Elements of Respiratory System

I. V. Vovk
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
O. I. Vovk
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine

SINOPSIS

We analysed physical and geometric characteristics of larynx and adjacent to it cavities from aerohydromechanic point. Physical model of this part of the respiratory system was built on the basis of this analysis. We developed the experimental methods that allow one to evaluate aerodynamic resistance of the physical model as well as spectra of noise, generated by the airflow along the model. We obtained a vast number of real data. Analysis of this data allowed us to draw a number of important laws. In particular, we showed that aerodynamic resistance of diaphragm, which modells the glottis, depends significantly on shape and dimensions of the last. We found out that as degree of symmetry of the glottis shape decreases and its area increases the aerodynamic resistance of diaphragm falls. It was shown that level and nature of spectra of noise generated by the airflow passing the glottis depends on shape and dimensions of the glottis as well as on airflow speed. In particular, we found that the decrease in symmetry of the glottis shape, increase of its area and decrease of airflow speed result in decrease of integral level of noise generated by the flow.