Abstract
Evolution of the fundamental mode of acoustic oscillations in a cavity filled with gaseous helium has been studied during immersion of this resonator into a helium transport Dewar vessel. Critical behavior of the parameter of oscillation decay has been observed on approaching the level below which thermoacoustic instability arises.
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Notes
Note, however, that even the exact solution [13] was obtained under significant simplifications–in particular, with neglect of the viscosity-induced thermal effects and density gradient related to the pressure drop necessary for ensuring the laminar flow.
In case of the onset of convection, the frequency is unchanged and remains equal to zero [16].
Preliminarily, the linearity of oscillations depending on the amplitude of excitation was checked; the phase difference of signals from the resonator ends amounted to 180°.
This behavior indicates that the bifurcation proceeds in “hard” (yet close to soft) regime of self-excitation. For a final conclusion, it is obviously necessary to follow the dynamics of bifurcation development at better temporal resolution.
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ACKNOWLEDGMENTS
The authors are grateful to A.F. Andreev, S.T. Boldarev, E.A. Brener, I.K. Butkevich, R.B. Gusev, V.V. Dmitriev, L.A. Mel’nikovskii, V.V. Sirenev, A.I. Smirnov, and I.N. Khlyustikov for fruitful discussions, support, and useful advice.
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Keshishev, K.O., Marchenko, V.I. & Podolyak, E.R. Precritical Thermoacoustics in Helium. J. Exp. Theor. Phys. 133, 786–791 (2021). https://doi.org/10.1134/S1063776121120104
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DOI: https://doi.org/10.1134/S1063776121120104