Vereshchagina T.N., Kudryaeva Y.V., Mikheev A.S.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Helmholtz resonators are widely used in various noise absorption systems, including engine noise reduction. The Helmholtz resonator is also one component of the thermoacoustic devices: engines, refrigerators and heat pumps, which are being developed and brought to the market actively now.
DeltaEC is a computer program that allows to calculate characteristics of thermoacoustic equipment under designing. In order to master the program authors of this article created earlier a calculation model for acoustic characteristics of two Helmholtz resonators connected by a hole in a partitive diaphragm. A comparison of the calculated pressure resonant curves with the experimental data obtained earlier showed good agreement. It allows to make the conclusion about the program, and the calculation model adequacy and about the reliability of the obtained obtained as a result of calculations. The distribution through the experimental model height of the oscillations pressure amplitude and the air flow rate, obtained as a results of calculations, are discussed at the article. The calculated resonance curves for the volume air flow rate and velocity in the diaphragm orifice are presented. It is shown that the resonant velocity amplitude of the air oscillations in the orifice does not depend on its diameter. A linear dependence of the resonant velocity amplitude square on the piston oscillation amplitude is obtained and explained.
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