Abstract
Finite amplitude standing wave induced in closed tube with cross sectional area change has been investigated by experiment. The effect of tube shape on getting high amplitude pressure waveform at closed end of the duct and the frequency responses has been discussed. Three kinds of tube namely conical, exponential and 1/2 cosine shaped were chosen for the experiment. The tubes were filled with HFC134a at normal atmospheric pressure and temperature. Results show that the peak-peak pressure amplitude increases with the increase of acceleration amplitude, but the amplitude and the presence of micro-shock varies with the tube shape. The frequency response curve in conical and exponential tube shows hardening and hysteresis behavior at high accelerations, however the response curve in cosine resonator is stable, as it does not show hysteresis and frequency shift behavior. Therefore, the 1/2 cosine tube is best candidate in order to design acoustic compressor.
Published Version
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