Stability Curves for a Thermoacoustic Prime Mover
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The purpose of this thesis is to investigate the stability curves for and steady state waveforms in a helium filled prime mover for both the fundamental and second modes. The predicted and measured stability limits are in reasonable agreement for both modes at most mean pressures. There is, however, evidence that the stability of one mode is affected by the presence of the other. It is also observed that one mode can suppress the other. Measurements were also made on a prime mover modified such the fundamental mode was selectively inhibited. Results indicate that the reduced fundamental amplitude allows the stability curve for the second mode to extend into the regions where the fundamental mode previously dominated. This produces a region where both modes are simultaneously excited. Analysis of the waveforms show that the resulting oscillations are quasiperiodic.
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