抄録
In order to explore the essential characteristics to pronounce sibilant fricative /s/, we prepared the simplified vocal tract models and compared the sound and the flow characteristics in the models with that in the realistic model which was constructed from the CT images. The two simplified models having a constriction at center position (CN model) and upper position (UN model) were proposed. The far-field sounds generated from the models were measured by a microphone. The large-eddy simulation was conducted and aeroacoustic sound sources was calculated in the models. The sound generated from UN model was similar to the sound generated from the realistic model compare to that of CN model. The velocity fluctuation and the sound source nearby the exit of constriction of CN model were larger than that of UN model and realistic model, indicating that reduction of the turbulent flow in the upstream of incisors is essential to pronounce sibilant /s/.
