Synchronous high-speed fluid structure interaction in a glottal jet model*

Surface deformation of a synthetic silicone hemilarynx in the Penn State Upper Airway Model is acquired synchronously with flow measurement of the pulsatile jet at pressures required to produce phonation in the fold. Stereo particle image velocimetry (PIV) is utilized for flow measurements using two Phantom v1212 high-speed cameras at 1 kHz repetition rate for image pairs illuminated by a simultaneous laser sheet. The surface deformation is captured using digital image correlation (DIC), using three Phantom v1212 high-speed cameras, at a repetition rate of 5 kHz of single images, illuminated by a triggered LED system simultaneously. Three DIC cameras are utilized to capture all sides of the vocal fold. The DIC and PIV image/illumination timing is set so that the DIC LED illumination will not be captured by the PIV cameras, and vice versa via an incoming 25 kHz clock signal to delay the DIC trigger pulse. The proper orthogonal decomposition (POD) is performed on the surface deformation to organize modal motions by energy content and correlate with the fluid motion in the jet.