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Measurements of the onset temperatures of a standing-wave thermoacoustic prime mover in air show a dramatically decreased onset temperature difference when liquid water is present on the stack surfaces. These data may be explained by considering the condensation and evaporation of water during the acoustic cycle [W. V. Slaton and R. Raspet, J. Acoust. Soc. Am. 108, 2569 (2000)]. The inert gas–vapor mixture thermoacoustic propagation equations are integrated through the resonator/stack system to determine the quality factor and resonant frequency using complex frequency analysis. In addition the 1-D thermoacoustic modeling code delta<th>e was modified to include these effects in the stack to predict onset temperatures.

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