Airflow patterns in the vicinity of an air-driven free reed
Jesse T. Jensen, James P. Cottingham · The Journal of the Acoustical Society of America · 2003
Free reed instruments are characterized by high-volume airflow rates through the oscillating reeds. Measurements have been made of the average volume flow rate through a single American organ reed as a function of blowing pressure. In addition, measurements of average air velocity have been made at a grid of points close to the vibrating air-driven reed, mounted on the surface of a laboratory wind chest. These measurements supplement earlier investigations, which explored relations among the reed motion, airflow, and acoustic pressure associated with the vibration of free reeds. [M. Busha and J. P. Cottingham, J. Acoust. Soc. Am. 111, 2376 (2002)]. An attempt has been made to determine whether the left–right asymmetry due to the asymmetric shape (twist) of the reed is reflected in the airflow pattern. A graphing program has been developed so that the airflow pattern can be visualized in two or three dimensions.