Pressure-velocity correlations in a scaled-up vocal fold model – symmetric case*

Simultaneous time resolved measurements of pressure, along the centerline, and DPIV, at the mid-plane, were made in a scaled-up vocal fold model.  This allowed for detailed analysis of the fluid-structure interaction associated with the moving vocal folds.  The overarching goal is applying experimental data to the theoretical framework of Krane (2013) in which the principal aeroacoustic source is expressed in terms of vocal fold drag, glottal jet dynamic head, and glottal exit volume flow, reconciling formal theoretical aeroacoustic descriptions of phonation with more traditional lumped-element descriptions.  In this way time resolved velocity field measurements can be used to compute time-resolved estimates of the relevant terms in the integral equations of motion, including phonation aeroacoustic source strength. A simplified 10x scale vocal fold model from Krane, et al. (2007) was used to examine symmetric, i.e. ‘healthy’, oscillatory motion of the vocal folds.  Using water as the working fluid, very high spatial and temporal resolution was achieved.   Experiments were dynamically scaled to examine frequencies corresponding to male and female voice.  Results showing phase relations between pressure and flow are will be presented.