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Thursday, July 11 • 09:20 - 09:40

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To establish the methodology of thermoacoustic heat pumps for effectively utilizing the energy of aerodynamic sound such as cavity tone, the thermoacoustic heat pump with a rectangular resonator was investigated. The air in the resonator was acoustically oscillated by the speaker at one end while the other end is closed. The excitation frequency was set to be the resonance frequency for the first and second acoustic modes. When installing the stack composed of the cascade of flat plates in the duct, the temperature difference across the stack was confirmed to occur for both the first and second modes. Also, the amplitude of the particle velocity and the acoustic work flow were calculated from the measured distributions of the amplitude and phase of the pressure fluctuations along the duct by the two-sensor method. The results show that the acoustic energy was clarified to be utilized in the stack. Moreover, the effects of the installation position of the stack on the temperature difference across the stack and the pressure fluctuations in the duct. For the acoustic mode, the obtained temperature difference becomes the highest for the stack position with distance from the closed end of around 50% of the one-quarter wavelength corresponding to the middle point between the anti-node and node of the pressure, where both the ratios of the amplitude of the pressure and particle velocity to each maximum at anti-nodes in the duct have the value of around 70 %. Also, it was confirmed that the stack position at the nodes of the pressure or velocity shows the small temperature difference.

Thursday July 11, 2019 09:20 - 09:40 EDT
Outremont 5
  T03 Aero… aircrft noise & vibr., SS03 Combust noise & thermoac