Revisiting the Open-End Reflection Coefficient and Turbulent Losses in an Organ Pipe with Low Mach Number Flowipe with low Mach number flow

The reflection coefficient of the open end belongs among essential parameters in physical description a flue organ pipe. It leads directly to practical topics such as pipe scaling. In this article, sound propagation is investigated inside an with most intense mean flow that achievable under musically relevant conditions. A theoretical model tested against experimental data obtain suitable formula for when non-negligible through considered. velocity profile examined by means particle image velocimetry. fully developed turbulent found and interactions acoustic boundary layer internal are discussed. higher value correction than expected from classical result Levine Schwinger found, but feature shall be associated wall thickness rather effects.