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A study of standing pressure waves within open and closed acoustic resonators
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Daniels, C. Finkbeiner, J. Steinetz, B. Raman, G. Li, X. |
| Copyright Year | 2002 |
| Description | The first section of the results presented herein was conducted on an axisymmetric resonator configured with open ventilation ports on either end of the resonator, but otherwise closed and free from obstruction. The remaining section presents the results of a similar resonator shape that was closed, but contained an axisymmetric blockage centrally located through the axis of the resonator. Ambient air was used as the working fluid. In each of the studies, the resonator was oscillated at the resonant frequency of the fluid contained within the cavity while the dynamic pressure, static pressure, and temperature of the fluid were recorded at both ends of the resonator. The baseline results showed a marked reduction in the amplitude of the dynamic pressure waveforms over previous studies due to the use of air instead of refrigerant as the working fluid. A sharp reduction in the amplitude of the acoustic pressure waves was expected and recorded when the configuration of the resonators was modified from closed to open. A change in the resonant frequency was recorded when blockages of differing geometries were used in the closed resonator, while acoustic pressure amplitudes varied little from baseline measurements. |
| File Size | 6073846 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110022626 |
| Archival Resource Key | ark:/13960/t25b52g48 |
| Language | English |
| Publisher Date | 2002-12-02 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Static Pressure Waveforms Blocking Elastic Waves Sound Pressure Standing Waves Cavities Resonant Frequencies Working Fluids Ventilation Sound Generators Resonators Refrigerants Dynamic Pressure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
