EFFECTS OF THREE-DIMENSIONAL FLOW INDUCED BY A UNILATERAL POLYP ON ENERGY TRANSFER AND VOCAL FOLD MOTION IN VOICED SPEECH
Byron D. Erath, Michael W. Plesniak · Proceeding of Seventh International Symposium on Turbulence and Shear Flow Phenomena · 2011
The evolution of three-dimensional glottal flow patterns arising from the presence of a unilateral polyp is presented. The polyp is modeled by a hemi-spheroid-like protuberance placed on the medial surface of 7.5 time scaled-up, driven vocal fold model. Particle image velocimetry measurements in both the streamwise and cross-stream directions identify the development of hairpin and horseshoe vortices during the closing phases of the phonatory cycle. These flow structures induce significant three-dimensional flow effects that are otherwise absent during normal vocal fold motion. Three-dimensional flow behavior is correlated to the energy exchange process that drives vocal fold motion.