Study on the mechanism and characteristics of reed whistle based on Workbench platform
LI Fengming1, WU Shengju2, XU Long1*, ZHANG Haidao1
(1 School of Science, China Jiliang University, Hangzhou 310018, Zhejiang, China;2 School of Physics and Information Technology, Shaanxi Normal University, Xi′an 710119, Shaanxi, China)
Abstract:
Using the bidirectional of fluid-solid coupling method, the physical model of reed-whistle was calculated based on the Workbench platform, and the vocal mechanism and characteristics were obtained. The results show that the main cause of the vibration of the reed is the effect of the jet on the lifting force of the reed, and the vortex formed by the jet contributes only at the starting stage. Since the cantilever reed has many natural frequency, and the frequency range of lift is wide, so that when the frequency of a lift is close to or equal to the natural frequency of the reed, the natural frequency of the reed will be aroused.With the increase of the jet pressure, the number of harmonic frequencies of the reed is gradually increased, and the harmonic frequency is approximately an odd multiple of the fundamental frequency.The fundamental frequency is stable when the distance from the nozzle to the reed is less than 5 mm. When the distance is more than 6 mm, the fundamental frequency starts to transition. With the increase of the distance, the number of harmonic frequencies decreases gradually, but the jet pressure increases its harmonic frequency will appear.
KeyWords:
reed; lift; distance
