Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
To clarify the effects of jet angle on the radiated sound from the flute, the radiated sound and jet fluctuations were experimentally investigated. An artificial blowing device with an artificial oral cavity was used to change the jet angle and the geometric edge offset (the relative height of edge from the jet oscillation center) independently. The actual jet offset was estimated based on the velocity profile measured by a hot-wire anemometer. Although the geometric edge offset was set to zero, the actual edge offset increased with the jet angle since the jet deflects toward inside the resonator. The radiated sound pressure of the first mode remained almost at the same level, while the sound of the second mode radiated more intensely with the increase of the jet angle in the range of 15 degrees from the measured angle for a human player. With the increase of the jet angle beyond this range, the sound of the third mode radiated less intensely. These results indicate that jet deflects toward inside the resonator influenced by the acoustic resonance and that the variation of the jet angle affects the actual jet offset, which affects the harmonic structure.
