Numerical analysis for nonlinear resonant oscillations of gas in axisymmetric closed tubes

A numerical investigation on nonlinear oscillations of gas in an axisymmetric closed tube is presented. When the tube is oscillated at a resonant frequency of the interior acoustic field, it is well known that acoustic variables such as density, velocity, smd pressure undergo very large perturbation, often described as nonlinear oscillation. One-dimensional nonlinear governing equations, which explicitly include attenuation terms related to viscosity, were derived. Then, the equations were solved numerically by using the higher-order finite difference scheme, which divided into two parts of spatial differentiation and time evolution. Numerical simulations were accomplished to study the effect of the tube shape on the maximum pressure we can obtain. The tubes of cylindrical, conical, and cosine shape, which have the same volume and length, were investigated. Results show that the resonant frequency and patterns of pressure waves strongly depend on not only the tube shape but also the amplitude of driving acceleration. The degree of nonlinearity of wave patterns was also measured by the newly defined nonlinear energy ratio of the pressure signals. It was found that the 1/2 cosine-shape tube is more suitable to induce high compression ratio than other shapes. (C) 2000 Acoustical Society of America. [S0001-4966(00)01511-3].
Publisher
AMER INST PHYSICS
Issue Date
2000-12
Language
ENG
Keywords

STANDING WAVES; BOUNDARY-CONDITIONS

Citation

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, v.108, no.6, pp.2765 - 2774

ISSN
0001-4966
URI
http://hdl.handle.net/10203/3820
DOI
http://dx.doi.org/10.1121/1.1312363
Appears in Collection
ME-Journal Papers(저널논문)
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