Abstract
AbstractThe paper presents experimental results of the visualization of the nonlinear aeroacoustic sound generation phenomena occurring in organ flue pipe. The phase-locked particle image velocimetry technique is applied to visualize the mixed velocity field in the transparent organ flue pipe model made from Plexiglas. Presented measurements were done using synchronization to the tone generated by the pipe itself sup- plied by controlled air flow with seeding particles. The time series of raw velocity field distribution images show nonlinear sound generation mechanisms: the large amplitude of deflection of the mean flue jet and vortex shedding in the region of pipe mouth. Proper Orthogonal Decomposition (POD) was then applied to the experimental data to separately visualize the mean mass flow, pulsating jet mass flow with vortices and also sound waves near the generation region as well as inside and outside of the pipe. The resulting POD spatial and temporal modes were used to approximate the acoustic velocity field behaviour at the pipe fundamental frequency. The temporal modes shapes are in a good agreement with the microphone pressure signal shape registered from a distance. Obtained decomposed spatial modes give interesting insight into sound generating region of the organ pipe and the transition area towards the pure acoustic field inside the resonance pipe. They can give qualitative and quantitative data to verify existing sound generation models used in Computational Fluid Dynamics (CFD) and Computational Aero-Acoustics (CAA).
Subject
Acoustics and Ultrasonics
Reference9 articles.
1. Transients in the speech of organ flue pipes a theoretical study;Flether;Acustica,1976
2. Experimental acoustic flow analysis inside a section of an acoustic waveguide of Acoustics;Weyna;Archives,2013
3. Turbulence and the dynamics of coherent structures Part Coherent structures of;Sirovich;Quarterly App Math,1987
4. The proper orthogonal decomposition in the analysis of turbulent flows;Berkooz;Annu Rev Fluid Mech,1993
5. Aeroacoustics of Musical Instruments;Fabre;Annu Rev Fluid Mech,2012
Cited by
11 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献