Abstract
The frequency response of a resonance tube including parallel plate heat exchangers and prime mover stack has been measured. The results are given in terms of the quality factor Q of the prime mover. As the temperature gradient across the prime mover stack is increased, the Q increases indicating a decrease in attenuation across the stack. When the temperature difference is sufficiently large (∼300 K), the resonator goes into self-sustained oscillation indicating negative attenuation. Observations of Q approaching the onset of self-oscillation are reported in helium gas at pressures from 170–500 kPa. The observed Q's and the resonance frequency are explained in terms of counterpropagating plane waves. [Work supported by ONR and the NPS Research Program.]
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