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Nonlinear oscillations and flow of gas within closed and open conical resonators
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Raman, Ganesh Steinetz, Bruce Li, Xiaofan Daniels, Christopher Finkbeiner, Joshua |
| Copyright Year | 2004 |
| Description | A dissonant acoustic resonator with a conical shaped cavity was tested in four configurations: (A) baseline resonator with closed ends and no blockage; (B) closed resonator with internal blockage; (C) ventilated resonator with no blockage; and (D) ventilated resonator with an applied pressure differential. These tests were conducted to investigate the effects of blockage and ventilation holes on dynamic pressurization. Additionally, the investigation was to determine the ability of acoustic pressurization to impede flow through the resonator. In each of the configurations studied, the entire resonator was oscillated at the gas resonant frequency while dynamic pressure, static pressure, and temperature of the fluid were measured. In the final configuration, flow through the resonator was recorded for three oscillation conditions. Ambient condition air was used as the working fluid. The baseline results showed a marked reduction in the amplitude of the dynamic pressure waveforms over previously published studies due to the use of air instead of refrigerant as the working fluid. A change in the resonant frequency was recorded when blockages of differing geometries were used in the closed resonator, while acoustic pressure amplitudes were reduced from baseline measurements. A sharp reduction in the amplitude of the acoustic pressure waves was expected and recorded when ventilation ports were added. With elevated pressure applied to one end of the resonator, flow was reduced by oscillating the cavity at the fluid fundamental resonant frequency compared to cases without oscillation and oscillation off-resonance. |
| File Size | 510721 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040050399 |
| Archival Resource Key | ark:/13960/t6353m96m |
| Language | English |
| Publisher Date | 2004-02-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Static Pressure Sound Waves Data Acquisition Control Systems Design Conical Bodies Oscillations Standing Waves Seals Stoppers Resonant Frequencies Gas Flow Working Fluids Nonlinearity Sound Generators Cavity Resonators Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
