Oscillations of Laval Nozzle Flow with Condensation : Part 2, On the Mechanism of Oscillations and their Amplitudes

概要

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In the case of moist air or steam rapidly expanding in Laval nozzles and condensation occurring in the supersonic section of the flow, if the heat released by condensation exceeds a certain quantity, the flow becomes unstable and a periodic flow oscillation occurs. In the first report, an empirical relation for the frequency of the periodic flow was presented and the range of oscillations was clarified. In the present paper, the flow oscillation has been examined experimentally for the case of rapid expansion of moist air, using a Ludwieg tube and a super sonic indraft wind tunnel. As the result, the effects of the initial relative humidity of the moist air and the nozzle geometry on the amplitude of pressure oscillation have been clarified. Furthermore, based on the experimental results, the mechanism of the flow oscillation has been discussed.
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